{"id":71434,"date":"2026-02-03T19:56:41","date_gmt":"2026-02-03T11:56:41","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/71434.html"},"modified":"2026-02-03T19:56:41","modified_gmt":"2026-02-03T11:56:41","slug":"spring%e4%be%9d%e8%b5%96%e6%b3%a8%e5%85%a5%e4%b8%8e%e8%87%aa%e5%8a%a8%e8%a3%85%e9%85%8d%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/71434.html","title":{"rendered":"Spring\u4f9d\u8d56\u6ce8\u5165\u4e0e\u81ea\u52a8\u88c5\u914d\u89e3\u6790"},"content":{"rendered":"<h2>Spring\u4f9d\u8d56\u6ce8\u5165\u4e0e\u81ea\u52a8\u88c5\u914d\u89e3\u6790<\/h2>\n<h3>\u5199\u5728\u524d\u9762<\/h3>\n<p>\u5982\u679c\u4f60\u60f3\u6df1\u5165\u5b66\u4e60SpringBoot\u7684\u81ea\u52a8\u914d\u7f6e\u539f\u7406&#xff0c;\u90a3\u4e48\u672c\u6587\u662f\u4f60\u5fc5\u987b\u638c\u63e1\u7684\u57fa\u7840\u77e5\u8bc6\u3002\u5f88\u591a\u4eba\u5728\u4f7f\u7528SpringBoot\u65f6&#xff0c;\u53ea\u77e5\u9053\u7528&#064;Autowired\u6ce8\u5165\u4f9d\u8d56&#xff0c;\u5374\u4e0d\u77e5\u9053\u80cc\u540e\u7684\u539f\u7406\u3002<\/p>\n<p>\u672c\u6587\u5c06\u4ece\u6700\u57fa\u7840\u7684\u6982\u5ff5\u8bb2\u8d77&#xff0c;\u5e26\u4f60\u5f7b\u5e95\u7406\u89e3Spring\u7684\u4f9d\u8d56\u6ce8\u5165\u673a\u5236\u3002\u65e0\u8bba\u4f60\u662f\u521a\u63a5\u89e6Spring\u7684\u65b0\u624b&#xff0c;\u8fd8\u662f\u60f3\u590d\u4e60\u5de9\u56fa\u7684\u8001\u624b&#xff0c;\u90fd\u80fd\u4ece\u672c\u6587\u83b7\u76ca\u3002<\/p>\n<p>\u9002\u5408\u4eba\u7fa4&#xff1a; Spring\u521d\u5b66\u8005\u3001\u51c6\u5907\u6df1\u5165\u5b66\u4e60SpringBoot\u7684\u5f00\u53d1\u8005\u3001\u9700\u8981\u590d\u4e60\u57fa\u7840\u7684\u5de5\u7a0b\u5e08<\/p>\n<h3>\u4e00\u3001\u6838\u5fc3\u6982\u5ff5&#xff1a;\u4ec0\u4e48\u662fBean\u3001\u4f9d\u8d56\u548c\u6ce8\u5165<\/h3>\n<p>\u5728\u5b66\u4e60\u4f9d\u8d56\u6ce8\u5165\u4e4b\u524d&#xff0c;\u6211\u4eec\u5fc5\u987b\u5148\u7406\u89e3\u4e09\u4e2a\u57fa\u672c\u6982\u5ff5\u3002<\/p>\n<h4>1.1 \u4ec0\u4e48\u662fBean&#xff1f;<\/h4>\n<p>Bean\u5c31\u662f\u7531Spring\u5bb9\u5668\u7ba1\u7406\u7684\u5bf9\u8c61\u3002<\/p>\n<p>\u5728\u4f20\u7edfJava\u5f00\u53d1\u4e2d&#xff0c;\u6211\u4eec\u8fd9\u6837\u521b\u5efa\u5bf9\u8c61&#xff1a;<\/p>\n<p><span class=\"token class-name\">UserService<\/span> userService <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">UserService<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u800c\u5728Spring\u4e2d&#xff0c;\u6211\u4eec\u4e0d\u9700\u8981\u81ea\u5df1new\u5bf9\u8c61&#xff0c;\u800c\u662f\u8ba9Spring\u5bb9\u5668\u5e2e\u6211\u4eec\u521b\u5efa\u548c\u7ba1\u7406&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span>  <span class=\"token comment\">\/\/ \u544a\u8bc9Spring&#xff1a;\u8fd9\u662f\u4e00\u4e2aBean&#xff0c;\u8bf7\u5e2e\u6211\u7ba1\u7406\u3002&#064;Service\u662f&#064;Component\u7684\u884d\u751f\u6ce8\u89e3<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ &#8230;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5f62\u8c61\u7684\u6bd4\u55bb&#xff1a;<\/p>\n<ul>\n<li>\u4f20\u7edf\u65b9\u5f0f&#xff1a;\u4f60\u9700\u8981\u4ec0\u4e48\u5bf9\u8c61&#xff0c;\u81ea\u5df1new\u4e00\u4e2a&#xff08;\u81ea\u5df1\u505a\u996d&#xff09;<\/li>\n<li>Spring\u65b9\u5f0f&#xff1a;\u4f60\u544a\u8bc9Spring\u9700\u8981\u4ec0\u4e48&#xff0c;Spring\u7ed9\u4f60\u521b\u5efa\u597d&#xff08;\u5916\u5356\u9001\u9910&#xff09;<\/li>\n<\/ul>\n<p>Bean\u7684\u7279\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u7531Spring\u5bb9\u5668\u521b\u5efa<\/li>\n<li>\u7531Spring\u5bb9\u5668\u7ba1\u7406\u751f\u547d\u5468\u671f<\/li>\n<li>\u9ed8\u8ba4\u662f\u5355\u4f8b\u7684&#xff08;\u6574\u4e2a\u5e94\u7528\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b&#xff09;<\/li>\n<li>\u53ef\u4ee5\u88ab\u5176\u4ed6Bean\u5f15\u7528<\/li>\n<\/ul>\n<h4>1.2 \u4ec0\u4e48\u662f\u4f9d\u8d56&#xff1f;<\/h4>\n<p>\u4f9d\u8d56\u5c31\u662f\u4e00\u4e2a\u5bf9\u8c61\u9700\u8981\u4f7f\u7528\u53e6\u4e00\u4e2a\u5bf9\u8c61\u6765\u5b8c\u6210\u5de5\u4f5c\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ UserService\u4f9d\u8d56UserDao<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token function\">getUser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Long<\/span> id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> userDao<span class=\"token punctuation\">.<\/span><span class=\"token function\">findById<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u9700\u8981\u7528\u5230UserDao<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d&#xff1a;<\/p>\n<ul>\n<li>UserService \u9700\u8981 UserDao \u624d\u80fd\u5b8c\u6210\u67e5\u8be2\u7528\u6237\u7684\u529f\u80fd<\/li>\n<li>\u6211\u4eec\u8bf4&#xff1a;UserService \u4f9d\u8d56 UserDao<\/li>\n<\/ul>\n<p>\u751f\u6d3b\u4e2d\u7684\u4f8b\u5b50&#xff1a;<\/p>\n<ul>\n<li>\u4f60\u8981\u5f00\u8f66\u4e0a\u73ed&#xff0c;\u4f60\u4f9d\u8d56\u6c7d\u8f66<\/li>\n<li>\u4f60\u8981\u505a\u996d&#xff0c;\u4f60\u4f9d\u8d56\u53a8\u5177<\/li>\n<li>\u4f60\u8981\u5199\u4ee3\u7801&#xff0c;\u4f60\u4f9d\u8d56\u7535\u8111<\/li>\n<\/ul>\n<h4>1.3 \u4ec0\u4e48\u662f\u6ce8\u5165\u4f9d\u8d56&#xff1f;<\/h4>\n<p>\u6ce8\u5165\u4f9d\u8d56\u5c31\u662f\u628a\u4e00\u4e2a\u5bf9\u8c61\u9700\u8981\u7684\u5176\u4ed6\u5bf9\u8c61&#034;\u9001&#034;\u7ed9\u5b83\u3002<\/p>\n<p>\u4f20\u7edf\u65b9\u5f0f&#xff08;\u81ea\u5df1\u521b\u5efa\u4f9d\u8d56&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UserService<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>userDao <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">UserDaoImpl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u81ea\u5df1\u521b\u5efa\u4f9d\u8d56<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f9d\u8d56\u6ce8\u5165\u65b9\u5f0f&#xff08;Spring\u5e2e\u4f60\u6ce8\u5165&#xff09;&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Autowired<\/span>  <span class=\"token comment\">\/\/ \u544a\u8bc9Spring&#xff1a;\u8bf7\u628aUserDao\u6ce8\u5165\u7ed9\u6211<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5f62\u8c61\u7684\u6bd4\u55bb&#xff1a;<\/p>\n<ul>\n<li>\u4f20\u7edf\u65b9\u5f0f&#xff1a;\u4f60\u8981\u559d\u5496\u5561&#xff0c;\u81ea\u5df1\u4e70\u8c46\u5b50\u3001\u78e8\u8c46\u3001\u716e\u5496\u5561&#xff08;\u81ea\u5df1\u521b\u5efa\u4f9d\u8d56&#xff09;<\/li>\n<li>\u4f9d\u8d56\u6ce8\u5165&#xff1a;\u4f60\u8981\u559d\u5496\u5561&#xff0c;\u544a\u8bc9\u5496\u5561\u5e97&#xff0c;\u5496\u5561\u5e97\u505a\u597d\u9001\u7ed9\u4f60&#xff08;Spring\u6ce8\u5165\u4f9d\u8d56&#xff09;<\/li>\n<\/ul>\n<p>\u4f9d\u8d56\u6ce8\u5165\u7684\u597d\u5904&#xff1a;<\/p>\n<li>\u89e3\u8026&#xff1a;UserService\u4e0d\u9700\u8981\u77e5\u9053UserDao\u7684\u5177\u4f53\u5b9e\u73b0<\/li>\n<li>\u6613\u6d4b\u8bd5&#xff1a;\u53ef\u4ee5\u8f7b\u677e\u66ff\u6362\u4e3aMock\u5bf9\u8c61\u8fdb\u884c\u6d4b\u8bd5<\/li>\n<li>\u6613\u7ef4\u62a4&#xff1a;\u8981\u6362\u5b9e\u73b0&#xff0c;\u4e0d\u9700\u8981\u4fee\u6539UserService\u4ee3\u7801<\/li>\n<li>\u7edf\u4e00\u7ba1\u7406&#xff1a;\u6240\u6709\u5bf9\u8c61\u7531Spring\u5bb9\u5668\u7edf\u4e00\u521b\u5efa\u548c\u7ba1\u7406<\/li>\n<h3>\u4e8c\u3001\u63a7\u5236\u53cd\u8f6c&#xff08;IoC&#xff09;&#xff1a;\u7406\u89e3Spring\u7684\u6838\u5fc3\u601d\u60f3<\/h3>\n<h4>2.1 \u4ec0\u4e48\u662f\u63a7\u5236\u53cd\u8f6c&#xff1f;<\/h4>\n<p>\u63a7\u5236\u53cd\u8f6c&#xff08;Inversion of Control&#xff0c;IoC&#xff09;\u662f\u4e00\u79cd\u8bbe\u8ba1\u601d\u60f3&#xff1a;\u628a\u5bf9\u8c61\u521b\u5efa\u548c\u7ba1\u7406\u7684\u63a7\u5236\u6743\u4ea4\u7ed9\u6846\u67b6\u3002<\/p>\n<p>\u7b80\u5355\u6765\u8bf4&#xff1a;\u5c31\u76f8\u5f53\u4e8e\u6846\u67b6\u5e2e\u4f60\u521b\u5efa\u5bf9\u8c61&#xff0c;\u53ea\u521b\u5efa\u4e00\u6b21&#xff0c;\u90a3\u4e2a\u7c7b\u8c03\u7528\u5c31\u628a\u5bf9\u8c61\u6ce8\u5165\u7ed9\u8c01<\/p>\n<p>\u597d\u5904&#xff1a;<\/p>\n<li>\u5f7b\u5e95\u89e3\u653e\u53cc\u624b&#xff1a;\u4e0d\u7528\u518d\u624b\u52a8new\u5bf9\u8c61\u3001\u624b\u52a8\u4f20\u4f9d\u8d56<\/li>\n<li>\u7edf\u4e00\u7ba1\u7406\u5bf9\u8c61&#xff1a;\u5355\u4f8b\u590d\u7528 &#043; \u751f\u547d\u5468\u671f\u5168\u6258\u7ba1<\/li>\n<ul>\n<li>\u5355\u4f8b\u590d\u7528&#xff1a;\u6846\u67b6\u521b\u5efa\u7684 Bean \u9ed8\u8ba4\u662f\u5355\u4f8b&#xff08;\u53ea\u521b\u5efa 1 \u6b21&#xff09;&#xff0c;\u6240\u6709\u9700\u8981\u8fd9\u4e2a\u5bf9\u8c61\u7684\u7c7b&#xff0c;\u6ce8\u5165\u7684\u90fd\u662f\u540c\u4e00\u4e2a\u5b9e\u4f8b&#xff0c;\u907f\u514d\u91cd\u590d\u521b\u5efa\u5bf9\u8c61\u6d6a\u8d39\u5185\u5b58&#xff08;\u6bd4\u5982\u4e00\u4e2aUserDao\u5bf9\u8c61&#xff0c;\u6240\u6709Service\u90fd\u7528\u540c\u4e00\u4e2a&#xff0c;\u4e0d\u7528\u6bcf\u6b21\u90fdnew&#xff09;&#xff1b;<\/li>\n<li>\u751f\u547d\u5468\u671f\u6258\u7ba1&#xff1a;\u5bf9\u8c61\u7684 \u201c\u521b\u5efa\u2192\u521d\u59cb\u5316\u2192\u4f7f\u7528\u2192\u9500\u6bc1\u201d \u5168\u7531\u6846\u67b6\u63a7\u5236&#xff0c;\u4f60\u53ef\u4ee5\u901a\u8fc7\u6ce8\u89e3&#xff08;\u5982&#064;PostConstruct\u521d\u59cb\u5316\u3001&#064;PreDestroy\u9500\u6bc1&#xff09;\u81ea\u5b9a\u4e49\u6d41\u7a0b&#xff0c;\u4e0d\u7528\u624b\u52a8\u7ba1\u7406\u5bf9\u8c61\u7684\u751f\u706d\u3002<\/li>\n<\/ul>\n<li>\u964d\u4f4e\u4ee3\u7801\u8026\u5408&#xff1a;\u7c7b\u4e4b\u95f4\u89e3\u8026&#xff0c;\u9879\u76ee\u6613\u7ef4\u62a4\u3001\u6613\u6269\u5c55<\/li>\n<p>\u4f20\u7edf\u65b9\u5f0f&#xff1a; \u4f60\u63a7\u5236\u4e00\u5207<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UserService<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4f60\u51b3\u5b9a\u521b\u5efa\u4ec0\u4e48\u5bf9\u8c61<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>userDao <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">UserDaoImpl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>IoC\u65b9\u5f0f&#xff1a; Spring\u63a7\u5236\u4e00\u5207<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ Spring\u51b3\u5b9a\u6ce8\u5165\u4ec0\u4e48\u5bf9\u8c61<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>&#034;\u53cd\u8f6c&#034;\u4f53\u73b0\u5728\u54ea\u91cc&#xff1f;<\/p>\n<table>\n<tr>\u7ef4\u5ea6\u4f20\u7edf\u65b9\u5f0fIoC\u65b9\u5f0f<\/tr>\n<tbody>\n<tr>\n<td>\u8c01\u521b\u5efa\u5bf9\u8c61<\/td>\n<td>\u4f60\u81ea\u5df1new<\/td>\n<td>Spring\u5bb9\u5668\u521b\u5efa<\/td>\n<\/tr>\n<tr>\n<td>\u8c01\u7ba1\u7406\u5bf9\u8c61<\/td>\n<td>\u4f60\u81ea\u5df1\u7ba1\u7406<\/td>\n<td>Spring\u5bb9\u5668\u7ba1\u7406<\/td>\n<\/tr>\n<tr>\n<td>\u8c01\u51b3\u5b9a\u4f9d\u8d56<\/td>\n<td>\u4f60\u5728\u4ee3\u7801\u4e2d\u5199\u6b7b<\/td>\n<td>Spring\u6839\u636e\u914d\u7f6e\u51b3\u5b9a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6838\u5fc3\u601d\u60f3&#xff1a; \u4e0d\u8981\u6253\u7535\u8bdd\u7ed9\u6211\u4eec&#xff0c;\u6211\u4eec\u4f1a\u6253\u7535\u8bdd\u7ed9\u4f60&#xff08;Don\u2019t call us, we\u2019ll call you&#xff09;<\/p>\n<h4>2.2 IoC\u5bb9\u5668\u7684\u4f5c\u7528<\/h4>\n<p>Spring\u7684IoC\u5bb9\u5668&#xff08;ApplicationContext&#xff09;\u5c31\u50cf\u4e00\u4e2a\u5bf9\u8c61\u5de5\u5382&#xff0c;\u8d1f\u8d23&#xff1a;<\/p>\n<li>\u521b\u5efa\u5bf9\u8c61&#xff1a;\u6839\u636e\u914d\u7f6e\u521b\u5efaBean<\/li>\n<li>\u7ba1\u7406\u751f\u547d\u5468\u671f&#xff1a;\u4ece\u521b\u5efa\u5230\u9500\u6bc1<\/li>\n<li>\u6ce8\u5165\u4f9d\u8d56&#xff1a;\u81ea\u52a8\u88c5\u914dBean\u4e4b\u95f4\u7684\u4f9d\u8d56\u5173\u7cfb<\/li>\n<li>\u63d0\u4f9b\u670d\u52a1&#xff1a;\u63d0\u4f9bBean\u7684\u67e5\u627e\u3001\u83b7\u53d6\u7b49\u529f\u80fd<\/li>\n<p><span class=\"token comment\">\/\/ Spring\u5bb9\u5668\u542f\u52a8\u65f6<\/span><br \/>\n<span class=\"token class-name\">ApplicationContext<\/span> context <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">AnnotationConfigApplicationContext<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">AppConfig<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4ece\u5bb9\u5668\u83b7\u53d6Bean<\/span><br \/>\n<span class=\"token class-name\">UserService<\/span> userService <span class=\"token operator\">&#061;<\/span> context<span class=\"token punctuation\">.<\/span><span class=\"token function\">getBean<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">UserService<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u8fd9\u4e2auserService\u5df2\u7ecf\u6ce8\u5165\u597d\u4e86\u6240\u6709\u4f9d\u8d56&#xff0c;\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528<\/span><br \/>\n<span class=\"token class-name\">User<\/span> user <span class=\"token operator\">&#061;<\/span> userService<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1L<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u4e09\u3001\u4f9d\u8d56\u6ce8\u5165\u7684\u4e09\u79cd\u65b9\u5f0f<\/h3>\n<p>Spring\u652f\u6301\u4e09\u79cd\u4f9d\u8d56\u6ce8\u5165\u65b9\u5f0f&#xff0c;\u6bcf\u79cd\u90fd\u6709\u5404\u81ea\u7684\u9002\u7528\u573a\u666f\u3002<\/p>\n<h4>\u65b9\u5f0f1&#xff1a;\u5b57\u6bb5\u6ce8\u5165&#xff08;\u6700\u5e38\u89c1\u4f46\u4e0d\u63a8\u8350&#xff09;<\/h4>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">EmailService<\/span> emailService<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f18\u70b9&#xff1a; \u4ee3\u7801\u7b80\u6d01&#xff0c;\u5199\u8d77\u6765\u65b9\u4fbf<\/p>\n<p>\u7f3a\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u65e0\u6cd5\u6ce8\u5165final\u5b57\u6bb5&#xff08;\u4e0d\u80fd\u4fdd\u8bc1\u4e0d\u53ef\u53d8\u6027&#xff09;<\/li>\n<li>\u4e0d\u5229\u4e8e\u5355\u5143\u6d4b\u8bd5&#xff08;\u5fc5\u987b\u542f\u52a8Spring\u5bb9\u5668\u6216\u4f7f\u7528\u53cd\u5c04&#xff09;<\/li>\n<li>\u8fdd\u53cd\u4e86\u9762\u5411\u5bf9\u8c61\u7684\u5c01\u88c5\u539f\u5219<\/li>\n<li>\u4f9d\u8d56\u5173\u7cfb\u4e0d\u660e\u786e<\/li>\n<\/ul>\n<h4>\u65b9\u5f0f2&#xff1a;\u6784\u9020\u5668\u6ce8\u5165&#xff08;\u5f3a\u70c8\u63a8\u8350&#xff09;<\/h4>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token comment\">\/\/&#064;RequiredArgsConstructor      <\/span><br \/>\n<span class=\"token comment\">\/\/Lombok\u6ce8\u89e3&#xff0c;\u5199\u4e86\u8fd9\u4e2a\u5c31\u4e0d\u7528\u5199\u6784\u9020\u5668\u4e86&#xff0c;\u4f46\u662f\u8981\u52a0\u5165Lombok\u4f9d\u8d56\u3002&#xff08;\u4f9d\u8d56\u5728\u535a\u4e3b\u4e4b\u524d\u7684\u5173\u4e8eLombok\u7684\u6587\u7ae0\u4e2d\u6709\u63d0\u5230\u8fc7&#xff09;<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">EmailService<\/span> emailService<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ Spring 4.3&#043; \u5355\u6784\u9020\u5668\u53ef\u7701\u7565&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UserService<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">EmailService<\/span> emailService<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>userDao <span class=\"token operator\">&#061;<\/span> userDao<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>emailService <span class=\"token operator\">&#061;<\/span> emailService<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u53ef\u4ee5\u4f7f\u7528final&#xff0c;\u4fdd\u8bc1\u4e0d\u53ef\u53d8\u6027\u548c\u7ebf\u7a0b\u5b89\u5168<\/li>\n<li>\u4fbf\u4e8e\u5355\u5143\u6d4b\u8bd5&#xff08;\u76f4\u63a5new\u5bf9\u8c61\u4f20\u53c2&#xff0c;\u65e0\u9700Spring\u5bb9\u5668&#xff09;<\/li>\n<li>\u4f9d\u8d56\u5173\u7cfb\u4e00\u76ee\u4e86\u7136<\/li>\n<li>\u5982\u679c\u4f9d\u8d56\u8fc7\u591a&#xff0c;\u6784\u9020\u5668\u53c2\u6570\u4f1a\u5f88\u957f&#xff0c;\u63d0\u9192\u4f60\u7c7b\u804c\u8d23\u53ef\u80fd\u8fc7\u91cd<\/li>\n<\/ul>\n<p>\u8fd9\u662fSpring\u5b98\u65b9\u63a8\u8350\u7684\u65b9\u5f0f&#xff01;<\/p>\n<h4>\u65b9\u5f0f3&#xff1a;Setter\u65b9\u6cd5\u6ce8\u5165<\/h4>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">setUserDao<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>userDao <span class=\"token operator\">&#061;<\/span> userDao<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u4f18\u70b9&#xff1a; \u53ef\u4ee5\u5728\u5bf9\u8c61\u521b\u5efa\u540e\u91cd\u65b0\u6ce8\u5165\u4f9d\u8d56&#xff08;\u9002\u5408\u53ef\u9009\u4f9d\u8d56&#xff09;<\/p>\n<p>\u7f3a\u70b9&#xff1a; \u4f9d\u8d56\u53ef\u80fd\u4e3anull&#xff0c;\u4e0d\u591f\u5b89\u5168<\/p>\n<p>\u4e09\u79cd\u65b9\u5f0f\u5bf9\u6bd4&#xff1a;<\/p>\n<table>\n<tr>\u7279\u6027\u5b57\u6bb5\u6ce8\u5165\u6784\u9020\u5668\u6ce8\u5165Setter\u6ce8\u5165<\/tr>\n<tbody>\n<tr>\n<td>\u4ee3\u7801\u7b80\u6d01\u5ea6<\/td>\n<td>\u6700\u7b80\u6d01<\/td>\n<td>\u4e2d\u7b49<\/td>\n<td>\u8f83\u7e41\u7410<\/td>\n<\/tr>\n<tr>\n<td>\u662f\u5426\u652f\u6301final<\/td>\n<td>\u5426<\/td>\n<td>\u662f<\/td>\n<td>\u5426<\/td>\n<\/tr>\n<tr>\n<td>\u6d4b\u8bd5\u53cb\u597d\u5ea6<\/td>\n<td>\u5dee<\/td>\n<td>\u597d<\/td>\n<td>\u4e2d\u7b49<\/td>\n<\/tr>\n<tr>\n<td>\u4f9d\u8d56\u660e\u786e\u5ea6<\/td>\n<td>\u4e0d\u660e\u786e<\/td>\n<td>\u975e\u5e38\u660e\u786e<\/td>\n<td>\u8f83\u660e\u786e<\/td>\n<\/tr>\n<tr>\n<td>\u5b98\u65b9\u63a8\u8350\u5ea6<\/td>\n<td>\u4e0d\u63a8\u8350<\/td>\n<td>\u5f3a\u70c8\u63a8\u8350<\/td>\n<td>\u9002\u5408\u53ef\u9009\u4f9d\u8d56<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u56db\u3001&#064;Autowired\u4e0e\u81ea\u52a8\u88c5\u914d\u8be6\u89e3<\/h3>\n<h4>4.1 \u4ec0\u4e48\u662f\u81ea\u52a8\u88c5\u914d&#xff1f;<\/h4>\n<p>\u81ea\u52a8\u88c5\u914d&#xff08;Auto-Wiring&#xff09;\u662fSpring\u81ea\u52a8\u4e3aBean\u6ce8\u5165\u4f9d\u8d56\u7684\u673a\u5236\u3002<\/p>\n<p>\u7b80\u5355\u6765\u8bf4&#xff1a;\u4f60\u53ea\u9700\u8981\u544a\u8bc9Spring&#034;\u6211\u9700\u8981\u8fd9\u4e2a\u4f9d\u8d56&#034;&#xff08;\u901a\u8fc7&#064;Autowired\u6ce8\u89e3&#xff09;&#xff0c;Spring\u4f1a\u81ea\u52a8\u5e2e\u4f60\u627e\u5230\u5408\u9002\u7684Bean\u5e76\u6ce8\u5165\u8fdb\u6765\u3002<\/p>\n<p>\u4f20\u7edf\u65b9\u5f0f&#xff08;\u624b\u52a8\u88c5\u914d&#xff09;&#xff1a;<\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>bean<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>userDao<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>com.example.dao.UserDaoImpl<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">\/&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>bean<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>userService<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>com.example.service.UserService<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>property<\/span> <span class=\"token attr-name\">name<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>userDao<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">ref<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>userDao<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">\/&gt;<\/span><\/span>  <span class=\"token comment\">&lt;!&#8211; \u624b\u52a8\u6307\u5b9a\u4f9d\u8d56 &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>bean<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>\u81ea\u52a8\u88c5\u914d\u65b9\u5f0f&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span>  <span class=\"token comment\">\/\/ \u81ea\u52a8\u88c5\u914d&#xff0c;Spring\u81ea\u52a8\u627e\u5230UserDao\u5e76\u6ce8\u5165<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.2 \u81ea\u52a8\u88c5\u914d\u7684\u6f14\u8fdb\u5386\u53f2<\/h4>\n<p>\u9636\u6bb51&#xff1a;XML\u65f6\u4ee3&#xff08;Spring 1.x &#8211; 2.x&#xff09;<\/p>\n<p><span class=\"token comment\">&lt;!&#8211; \u6309\u7c7b\u578b\u81ea\u52a8\u88c5\u914d &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>bean<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>userService<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>com.example.service.UserService<span class=\"token punctuation\">&#034;<\/span><\/span><br \/>\n      <span class=\"token attr-name\">autowire<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>byType<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">\/&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">&lt;!&#8211; \u6309\u540d\u79f0\u81ea\u52a8\u88c5\u914d &#8211;&gt;<\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>bean<\/span> <span class=\"token attr-name\">id<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>userService<span class=\"token punctuation\">&#034;<\/span><\/span> <span class=\"token attr-name\">class<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>com.example.service.UserService<span class=\"token punctuation\">&#034;<\/span><\/span><br \/>\n      <span class=\"token attr-name\">autowire<\/span><span class=\"token attr-value\"><span class=\"token punctuation attr-equals\">&#061;<\/span><span class=\"token punctuation\">&#034;<\/span>byName<span class=\"token punctuation\">&#034;<\/span><\/span><span class=\"token punctuation\">\/&gt;<\/span><\/span><\/p>\n<p>\u9636\u6bb52&#xff1a;\u6ce8\u89e3\u65f6\u4ee3&#xff08;Spring 2.5&#043;&#xff09;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span>  <span class=\"token comment\">\/\/ \u6ce8\u89e3\u65b9\u5f0f&#xff0c;\u66f4\u7b80\u6d01<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9636\u6bb53&#xff1a;\u7eafJava\u914d\u7f6e\u65f6\u4ee3&#xff08;Spring 3.0&#043;&#xff09;<\/p>\n<p>Spring 3.0 \u5f15\u5165\u4e86 &#064;Configuration \u548c &#064;Bean&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Configuration<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AppConfig<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Bean<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UserDao<\/span> <span class=\"token function\">userDao<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">UserDaoImpl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Bean<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token function\">userService<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">UserService<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u81ea\u52a8\u88c5\u914d<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9636\u6bb54&#xff1a;SpringBoot\u65f6\u4ee3&#xff08;Spring 4.0&#043;&#xff09;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;SpringBootApplication<\/span>  <span class=\"token comment\">\/\/ \u81ea\u52a8\u626b\u63cf&#xff0c;\u81ea\u52a8\u88c5\u914d<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Application<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">SpringApplication<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">run<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Application<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.3 \u81ea\u52a8\u88c5\u914d\u7684\u5de5\u4f5c\u539f\u7406<\/h4>\n<p>\u6838\u5fc3\u5904\u7406\u5668&#xff1a; AutowiredAnnotationBeanPostProcessor<\/p>\n<p>\u5b8c\u6574\u6d41\u7a0b&#xff1a;<\/p>\n<p>1. Spring\u5bb9\u5668\u542f\u52a8&#xff0c;\u626b\u63cf\u6240\u6709Bean\u5b9a\u4e49<br \/>\n   \u2193<br \/>\n2. \u521b\u5efaBean\u5b9e\u4f8b&#xff08;\u8c03\u7528\u6784\u9020\u51fd\u6570&#xff09;<br \/>\n   \u2193<br \/>\n3. AutowiredAnnotationBeanPostProcessor\u4ecb\u5165<br \/>\n   \u2193<br \/>\n4. \u626b\u63cfBean\u4e2d\u7684&#064;Autowired\u6ce8\u89e3<br \/>\n   \u2193<br \/>\n5. \u89e3\u6790\u4f9d\u8d56\u7c7b\u578b<br \/>\n   \u2193<br \/>\n6. \u5728\u5bb9\u5668\u4e2d\u67e5\u627e\u5339\u914d\u7684Bean<br \/>\n   \u251c\u2500 \u6309\u7c7b\u578b\u67e5\u627e&#xff08;byType&#xff09;- \u9ed8\u8ba4\u7b56\u7565<br \/>\n   \u251c\u2500 \u5982\u679c\u6709\u591a\u4e2a&#xff0c;\u6309&#064;Primary\u7b5b\u9009<br \/>\n   \u251c\u2500 \u5982\u679c\u8fd8\u6709\u591a\u4e2a&#xff0c;\u6309&#064;Qualifier\u7b5b\u9009<br \/>\n   \u2514\u2500 \u5982\u679c\u8fd8\u6709\u591a\u4e2a&#xff0c;\u6309\u5b57\u6bb5\u540d\u79f0\u5339\u914d<br \/>\n   \u2193<br \/>\n7. \u901a\u8fc7\u53cd\u5c04\u6ce8\u5165\u4f9d\u8d56<br \/>\n   \u2193<br \/>\n8. Bean\u521d\u59cb\u5316\u5b8c\u6210<\/p>\n<h4>4.4 \u81ea\u52a8\u88c5\u914d\u7684\u5339\u914d\u7b56\u7565<\/h4>\n<p>\u7b56\u75651&#xff1a;\u6309\u7c7b\u578b\u5339\u914d&#xff08;byType&#xff09;- \u9ed8\u8ba4<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u67e5\u627eUserDao\u7c7b\u578b\u7684Bean<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u627e\u52301\u4e2a \u2192 \u76f4\u63a5\u6ce8\u5165<\/li>\n<li>\u627e\u52300\u4e2a \u2192 \u629b\u51fa\u5f02\u5e38&#xff08;\u9664\u975erequired&#061;false&#xff09;<\/li>\n<li>\u627e\u5230\u591a\u4e2a \u2192 \u7ee7\u7eed\u4e0b\u4e00\u6b65\u5339\u914d<\/li>\n<\/ul>\n<p>\u7b56\u75652&#xff1a;\u6309&#064;Primary\u5339\u914d &#8211; \u4f18\u5148\u7ea7<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Repository<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Primary<\/span>  <span class=\"token comment\">\/\/ \u6807\u8bb0\u4e3a\u9996\u9009<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserDaoMysqlImpl<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">UserDao<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token annotation punctuation\">&#064;Repository<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserDaoMongoImpl<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">UserDao<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u81ea\u52a8\u9009\u62e9&#064;Primary\u6807\u8bb0\u7684Bean<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7b56\u75653&#xff1a;\u6309&#064;Qualifier\u5339\u914d &#8211; \u660e\u786e\u6307\u5b9a<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Qualifier<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;userDaoMongoImpl&#034;<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u660e\u786e\u6307\u5b9a\u4f7f\u7528\u54ea\u4e2aBean<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7b56\u75654&#xff1a;\u6309\u5b57\u6bb5\u540d\u79f0\u5339\u914d &#8211; \u8f85\u52a9<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDaoMysqlImpl<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5b57\u6bb5\u540d\u4e0eBean\u540d\u79f0\u4e00\u81f4<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7b56\u75655&#xff1a;\u6ce8\u5165\u96c6\u5408 &#8211; \u83b7\u53d6\u6240\u6709\u5b9e\u73b0<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6ce8\u5165\u6240\u6709UserDao\u7c7b\u578b\u7684Bean<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">UserDao<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> userDaoList<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6ce8\u5165\u6240\u6709UserDao\u7c7b\u578b\u7684Bean\u5230Map&#xff0c;key\u4e3aBean\u540d\u79f0<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">UserDao<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> userDaoMap<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5339\u914d\u4f18\u5148\u7ea7&#xff1a;<\/p>\n<p>&#064;Qualifier&#xff08;\u6700\u9ad8\u4f18\u5148\u7ea7&#xff09;<br \/>\n    \u2193<br \/>\n&#064;Primary<br \/>\n    \u2193<br \/>\n\u5b57\u6bb5\u540d\u79f0\u5339\u914d<br \/>\n    \u2193<br \/>\n\u7c7b\u578b\u5339\u914d&#xff08;\u9ed8\u8ba4&#xff09;<\/p>\n<h4>4.5 \u5904\u7406\u591a\u4e2a\u5019\u9009Bean<\/h4>\n<p>\u5f53\u5bb9\u5668\u4e2d\u6709\u591a\u4e2a\u76f8\u540c\u7c7b\u578b\u7684Bean\u65f6&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6709\u4e24\u4e2aUserDao\u7684\u5b9e\u73b0<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Repository<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserDaoMysqlImpl<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">UserDao<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token annotation punctuation\">&#064;Repository<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserDaoMongoImpl<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">UserDao<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6ce8\u5165\u65f6\u4f1a\u62a5\u9519<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u9519\u8bef&#xff1a;\u627e\u52302\u4e2a\u5019\u9009Bean<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u89e3\u51b3\u65b9\u6848\u603b\u7ed3&#xff1a;<\/p>\n<table>\n<tr>\u65b9\u6848\u4ee3\u7801\u793a\u4f8b\u9002\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>&#064;Qualifier<\/td>\n<td>&#064;Qualifier(&#034;userDaoMysqlImpl&#034;)<\/td>\n<td>\u660e\u786e\u77e5\u9053\u8981\u7528\u54ea\u4e2aBean<\/td>\n<\/tr>\n<tr>\n<td>&#064;Primary<\/td>\n<td>\u5728Bean\u4e0a\u52a0&#064;Primary<\/td>\n<td>\u6709\u4e00\u4e2a\u9ed8\u8ba4\u9996\u9009\u5b9e\u73b0<\/td>\n<\/tr>\n<tr>\n<td>\u5b57\u6bb5\u540d\u5339\u914d<\/td>\n<td>private UserDao userDaoMysqlImpl<\/td>\n<td>\u7b80\u5355\u573a\u666f<\/td>\n<\/tr>\n<tr>\n<td>\u6ce8\u5165List\/Map<\/td>\n<td>List&lt;UserDao&gt; userDaoList<\/td>\n<td>\u9700\u8981\u4f7f\u7528\u6240\u6709\u5b9e\u73b0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>4.6 \u53ef\u9009\u4f9d\u8d56\u7684\u5904\u7406<\/h4>\n<p>\u65b9\u5f0f1&#xff1a;\u4f7f\u7528required&#061;false<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><span class=\"token punctuation\">(<\/span>required <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u627e\u4e0d\u5230Bean\u4e0d\u62a5\u9519&#xff0c;\u6ce8\u5165null<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">CacheService<\/span> cacheService<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token function\">getUser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Long<\/span> id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cacheService <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">User<\/span> cached <span class=\"token operator\">&#061;<\/span> cacheService<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>cached <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> cached<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> userDao<span class=\"token punctuation\">.<\/span><span class=\"token function\">findById<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u65b9\u5f0f2&#xff1a;\u4f7f\u7528Optional&#xff08;\u66f4\u4f18\u96c5&#xff09;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">CacheService<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> cacheService<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token function\">getUser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Long<\/span> id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> cacheService<br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>cache <span class=\"token operator\">-&gt;<\/span> cache<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">orElseGet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> userDao<span class=\"token punctuation\">.<\/span><span class=\"token function\">findById<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.7 \u81ea\u52a8\u88c5\u914d\u7684\u6ce8\u610f\u4e8b\u9879<\/h4>\n<p>\u6ce8\u610f1&#xff1a;\u7406\u89e3\u88c5\u914d\u65f6\u673a<\/p>\n<p>\u81ea\u52a8\u88c5\u914d\u53d1\u751f\u5728Bean\u7684\u5c5e\u6027\u6ce8\u5165\u9636\u6bb5&#xff0c;\u5728\u6784\u9020\u51fd\u6570\u4e4b\u540e&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UserService<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u9519\u8bef&#xff1a;\u6b64\u65f6userDao\u8fd8\u672a\u6ce8\u5165&#xff0c;\u4e3anull<\/span><br \/>\n        <span class=\"token comment\">\/\/ userDao.findAll();<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;PostConstruct<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u6b63\u786e&#xff1a;\u6b64\u65f6userDao\u5df2\u7ecf\u6ce8\u5165<\/span><br \/>\n        userDao<span class=\"token punctuation\">.<\/span><span class=\"token function\">findAll<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f2&#xff1a;\u907f\u514d\u5faa\u73af\u4f9d\u8d56<\/p>\n<p><span class=\"token comment\">\/\/ \u4e0d\u63a8\u8350&#xff1a;\u5faa\u73af\u4f9d\u8d56<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">OrderService<\/span> orderService<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">OrderService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserService<\/span> userService<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u63a8\u8350&#xff1a;\u91cd\u65b0\u8bbe\u8ba1&#xff0c;\u5355\u5411\u4f9d\u8d56<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">OrderService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserService<\/span> userService<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u5355\u5411\u4f9d\u8d56<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4.8 \u81ea\u52a8\u88c5\u914d\u4e0eSpringBoot\u81ea\u52a8\u914d\u7f6e\u7684\u533a\u522b<\/h4>\n<p>\u5f88\u591a\u4eba\u5bb9\u6613\u6df7\u6dc6\u8fd9\u4e24\u4e2a\u6982\u5ff5&#xff1a;<\/p>\n<p>\u81ea\u52a8\u88c5\u914d&#xff08;Auto-Wiring&#xff09;&#xff1a;<\/p>\n<ul>\n<li>Spring\u7684\u6838\u5fc3\u529f\u80fd<\/li>\n<li>\u8d1f\u8d23\u6ce8\u5165\u4f9d\u8d56<\/li>\n<li>\u901a\u8fc7&#064;Autowired\u5b9e\u73b0<\/li>\n<li>Bean\u5df2\u5b58\u5728&#xff0c;\u53ea\u662f\u6ce8\u5165<\/li>\n<\/ul>\n<p>\u81ea\u52a8\u914d\u7f6e&#xff08;Auto-Configuration&#xff09;&#xff1a;<\/p>\n<ul>\n<li>SpringBoot\u7684\u7279\u6027<\/li>\n<li>\u8d1f\u8d23\u521b\u5efaBean<\/li>\n<li>\u901a\u8fc7&#064;EnableAutoConfiguration\u5b9e\u73b0<\/li>\n<li>\u6839\u636e\u6761\u4ef6\u81ea\u52a8\u521b\u5efaBean<\/li>\n<\/ul>\n<p>\u5173\u7cfb&#xff1a;<\/p>\n<p>SpringBoot\u81ea\u52a8\u914d\u7f6e \u2192 \u521b\u5efaBean<br \/>\n         \u2193<br \/>\nSpring\u81ea\u52a8\u88c5\u914d \u2192 \u6ce8\u5165Bean<\/p>\n<p>\u4e3e\u4f8b&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ SpringBoot\u81ea\u52a8\u914d\u7f6e&#xff1a;\u81ea\u52a8\u521b\u5efaDataSource Bean<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Configuration<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;ConditionalOnClass<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">DataSource<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DataSourceAutoConfiguration<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Bean<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">DataSource<\/span> <span class=\"token function\">dataSource<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">DataSourceBuilder<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u81ea\u52a8\u88c5\u914d&#xff1a;\u81ea\u52a8\u6ce8\u5165DataSource\u4f9d\u8d56<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span>  <span class=\"token comment\">\/\/ \u81ea\u52a8\u88c5\u914d<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">DataSource<\/span> dataSource<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8fd9\u4e2aBean\u662f\u81ea\u52a8\u914d\u7f6e\u521b\u5efa\u7684<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u4e94\u3001\u5176\u4ed6\u6ce8\u5165\u6ce8\u89e3\u5bf9\u6bd4<\/h3>\n<h4>5.1 &#064;Resource&#xff08;JSR-250\u89c4\u8303&#xff09;<\/h4>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Resource<\/span>  <span class=\"token comment\">\/\/ \u9ed8\u8ba4\u6309\u540d\u79f0\u88c5\u914d<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Resource<\/span><span class=\"token punctuation\">(<\/span>name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;userDaoMysqlImpl&#034;<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u6307\u5b9aBean\u540d\u79f0<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao2<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>&#064;Autowired vs &#064;Resource&#xff1a;<\/p>\n<table>\n<tr>\u7279\u6027&#064;Autowired&#064;Resource<\/tr>\n<tbody>\n<tr>\n<td>\u6765\u6e90<\/td>\n<td>Spring\u6846\u67b6<\/td>\n<td>Java EE\u89c4\u8303<\/td>\n<\/tr>\n<tr>\n<td>\u9ed8\u8ba4\u88c5\u914d\u65b9\u5f0f<\/td>\n<td>\u6309\u7c7b\u578b&#xff08;byType&#xff09;<\/td>\n<td>\u6309\u540d\u79f0&#xff08;byName&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u6307\u5b9aBean<\/td>\n<td>\u914d\u5408&#064;Qualifier<\/td>\n<td>\u4f7f\u7528name\u5c5e\u6027<\/td>\n<\/tr>\n<tr>\n<td>\u652f\u6301required<\/td>\n<td>\u652f\u6301<\/td>\n<td>\u4e0d\u652f\u6301<\/td>\n<\/tr>\n<tr>\n<td>\u652f\u6301\u6784\u9020\u5668\u6ce8\u5165<\/td>\n<td>\u652f\u6301<\/td>\n<td>\u4e0d\u652f\u6301<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5efa\u8bae&#xff1a; \u4f18\u5148\u4f7f\u7528&#064;Autowired&#xff0c;\u529f\u80fd\u66f4\u5f3a\u5927&#xff0c;\u662fSpring\u539f\u751f\u6ce8\u89e3\u3002<\/p>\n<h4>5.2 &#064;Inject&#xff08;JSR-330&#xff09;<\/h4>\n<p>\u6765\u81eaJava\u4f9d\u8d56\u6ce8\u5165\u89c4\u8303&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Inject<\/span>  <span class=\"token comment\">\/\/ \u529f\u80fd\u7c7b\u4f3c&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u9700\u8981\u989d\u5916\u5f15\u5165\u4f9d\u8d56&#xff1a;<\/p>\n<p><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>javax.inject<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>javax.inject<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>1<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><br \/>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><\/p>\n<p>&#064;Inject vs &#064;Autowired&#xff1a;<\/p>\n<table>\n<tr>\u7279\u6027&#064;Autowired&#064;Inject<\/tr>\n<tbody>\n<tr>\n<td>\u6765\u6e90<\/td>\n<td>Spring<\/td>\n<td>JSR-330<\/td>\n<\/tr>\n<tr>\n<td>\u662f\u5426\u652f\u6301required<\/td>\n<td>\u652f\u6301<\/td>\n<td>\u4e0d\u652f\u6301<\/td>\n<\/tr>\n<tr>\n<td>\u914d\u5408\u6ce8\u89e3<\/td>\n<td>&#064;Qualifier<\/td>\n<td>&#064;Named<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5efa\u8bae&#xff1a; \u9664\u975e\u9700\u8981\u8de8\u6846\u67b6\u517c\u5bb9&#xff0c;\u5426\u5219\u4f7f\u7528 &#064;Autowired \u5373\u53ef\u3002<\/p>\n<h4>5.3 &#064;Value&#xff08;\u6ce8\u5165\u914d\u7f6e\u503c&#xff09;<\/h4>\n<p>\u7528\u4e8e\u6ce8\u5165\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684\u503c&#xff0c;\u8fd9\u662f\u5b66\u4e60SpringBoot\u914d\u7f6e\u7684\u57fa\u7840&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Value<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;${app.name}&#034;<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u4ece\u914d\u7f6e\u6587\u4ef6\u8bfb\u53d6<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> appName<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Value<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;${app.max-users:100}&#034;<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u6307\u5b9a\u9ed8\u8ba4\u503c100<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> maxUsers<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Value<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;#{systemProperties[&#039;user.home&#039;]}&#034;<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ SpEL\u8868\u8fbe\u5f0f<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> userHome<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u914d\u7f6e\u6587\u4ef6&#xff08;application.properties&#xff09;&#xff1a;<\/p>\n<p>app.name&#061;\u6211\u7684\u5e94\u7528<br \/>\napp.max-users&#061;500<\/p>\n<h3>\u516d\u3001\u5e38\u89c1\u95ee\u9898\u4e0e\u89e3\u51b3\u65b9\u6848<\/h3>\n<h4>\u95ee\u98981&#xff1a;\u5faa\u73af\u4f9d\u8d56<\/h4>\n<p>\u4ec0\u4e48\u662f\u5faa\u73af\u4f9d\u8d56&#xff1f;<\/p>\n<p>\u4e24\u4e2a\u6216\u591a\u4e2aBean\u76f8\u4e92\u4f9d\u8d56&#xff0c;\u5f62\u6210\u95ed\u73af&#xff1a;<\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">OrderService<\/span> orderService<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ UserService\u4f9d\u8d56OrderService<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">OrderService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserService<\/span> userService<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ OrderService\u4f9d\u8d56UserService<\/span><br \/>\n<span class=\"token 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punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">OrderService<\/span> orderService<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UserService<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">OrderService<\/span> orderService<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>orderService <span class=\"token operator\">&#061;<\/span> orderService<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token annotation punctuation\">&#064;Service<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">OrderService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">UserService<\/span> userService<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">OrderService<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">UserService<\/span> userService<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>userService <span class=\"token operator\">&#061;<\/span> userService<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u62a5\u9519&#xff01;\u65e0\u6cd5\u89e3\u51b3<\/span><br \/>\n    <span class=\"token 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class=\"token class-name\">OrderService<\/span> orderService<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>orderService <span class=\"token operator\">&#061;<\/span> orderService<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6ce8\u5165\u4ee3\u7406\u5bf9\u8c61&#xff0c;\u5ef6\u8fdf\u521d\u59cb\u5316<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<li>\u6539\u7528\u5b57\u6bb5\u6ce8\u5165&#xff08;\u4e0d\u63a8\u8350&#xff0c;\u53ea\u662f\u6743\u5b9c\u4e4b\u8ba1&#xff09;<\/li>\n<h4>\u95ee\u98982&#xff1a;\u6ce8\u5165\u7684Bean\u4e3anull<\/h4>\n<p>\u5e38\u89c1\u539f\u56e0&#xff1a;<\/p>\n<p>\u539f\u56e01&#xff1a;\u7c7b\u6ca1\u6709\u88abSpring\u7ba1\u7406<\/p>\n<p><span class=\"token comment\">\/\/ 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punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6b63\u5e38\u6ce8\u5165<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u539f\u56e02&#xff1a;\u5305\u626b\u63cf\u8def\u5f84\u4e0d\u5bf9<\/p>\n<p><span class=\"token annotation punctuation\">&#064;SpringBootApplication<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;ComponentScan<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;com.example.service&#034;<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u53ea\u626b\u63cfservice\u5305<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token 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punctuation\">}<\/span><\/p>\n<p>\u539f\u56e03&#xff1a;\u76f4\u63a5new\u5bf9\u8c61&#xff0c;\u4e0d\u4eceSpring\u5bb9\u5668\u83b7\u53d6<\/p>\n<p><span class=\"token comment\">\/\/ \u9519\u8bef&#xff1a;\u76f4\u63a5new\u7684\u5bf9\u8c61&#xff0c;Spring\u65e0\u6cd5\u6ce8\u5165\u4f9d\u8d56<\/span><br \/>\n<span class=\"token class-name\">UserService<\/span> service <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">UserService<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nservice<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1L<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ userDao\u4e3anull&#xff0c;\u62a5NPE<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u6b63\u786e&#xff1a;\u4eceSpring\u5bb9\u5668\u83b7\u53d6<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;RestController<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">UserController<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserService<\/span> userService<span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u4ece\u5bb9\u5668\u83b7\u53d6&#xff0c;\u4f9d\u8d56\u5df2\u6ce8\u5165<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;GetMapping<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\/user\/{id}&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">User<\/span> <span class=\"token function\">getUser<\/span><span class=\"token punctuation\">(<\/span><span class=\"token annotation punctuation\">&#064;PathVariable<\/span> <span class=\"token class-name\">Long<\/span> id<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> userService<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUser<\/span><span class=\"token punctuation\">(<\/span>id<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u6b63\u5e38\u4f7f\u7528<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u539f\u56e04&#xff1a;\u5728\u9759\u6001\u5b57\u6bb5\u4e0a\u4f7f\u7528&#064;Autowired<\/p>\n<p><span class=\"token comment\">\/\/ 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punctuation\">&#064;Autowired<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> cache<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u9519\u8bef&#xff1a;\u6784\u9020\u51fd\u6570\u6267\u884c\u65f6&#xff0c;userDao\u8fd8\u672a\u6ce8\u5165<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">UserService<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span 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class-name\">UserDao<\/span> userDao<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">User<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> cache<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;PostConstruct<\/span>  <span class=\"token comment\">\/\/ \u5728\u4f9d\u8d56\u6ce8\u5165\u5b8c\u6210\u540e\u6267\u884c<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">init<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>cache <span 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