{"id":65602,"date":"2026-01-25T12:40:40","date_gmt":"2026-01-25T04:40:40","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/65602.html"},"modified":"2026-01-25T12:40:40","modified_gmt":"2026-01-25T04:40:40","slug":"spring-%e5%a6%82%e4%bd%95%e8%a7%a3%e5%86%b3%e5%be%aa%e7%8e%af%e4%be%9d%e8%b5%96%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/65602.html","title":{"rendered":"Spring \u5982\u4f55\u89e3\u51b3\u5faa\u73af\u4f9d\u8d56\uff1f"},"content":{"rendered":"<p>Spring \u89e3\u51b3\u5faa\u73af\u4f9d\u8d56\u4e3b\u8981\u901a\u8fc7\u4e09\u7ea7\u7f13\u5b58\u673a\u5236\u6765\u5b9e\u73b0\u3002<\/p>\n<h3>\u4e00\u3001\u4ec0\u4e48\u662f\u5faa\u73af\u4f9d\u8d56<\/h3>\n<p>\u5faa\u73af\u4f9d\u8d56\u662f\u6307\u4e24\u4e2a\u6216\u591a\u4e2a Bean \u4e4b\u95f4\u76f8\u4e92\u4f9d\u8d56&#xff0c;\u5f62\u6210\u95ed\u73af\u3002\u4f8b\u5982&#xff1a;<\/p>\n<ul>\n<li>A \u4f9d\u8d56 B<\/li>\n<li>B \u4f9d\u8d56 A<\/li>\n<\/ul>\n<p>\u6216\u8005\u66f4\u590d\u6742\u7684\u60c5\u51b5&#xff1a;<\/p>\n<ul>\n<li>A \u4f9d\u8d56 B<\/li>\n<li>B \u4f9d\u8d56 C<\/li>\n<li>C \u4f9d\u8d56 A<\/li>\n<\/ul>\n<h3>\u4e8c\u3001Spring \u7684\u4e09\u7ea7\u7f13\u5b58\u673a\u5236<\/h3>\n<p>Spring \u4f7f\u7528\u4e09\u4e2a Map \u6765\u7ba1\u7406 Bean \u7684\u5b9e\u4f8b&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u4e00\u7ea7\u7f13\u5b58&#xff1a;\u5b58\u653e\u5b8c\u6574\u7684 Bean&#xff08;\u5df2\u5b9e\u4f8b\u5316\u3001\u5df2\u586b\u5145\u5c5e\u6027\u3001\u5df2\u521d\u59cb\u5316&#xff09;<\/span><br \/>\n<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/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\">Object<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> singletonObjects <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ConcurrentHashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">256<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4e8c\u7ea7\u7f13\u5b58&#xff1a;\u5b58\u653e\u65e9\u671f\u66b4\u9732\u7684 Bean&#xff08;\u5df2\u5b9e\u4f8b\u5316\u3001\u672a\u586b\u5145\u5c5e\u6027&#xff09;<\/span><br \/>\n<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/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\">Object<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> earlySingletonObjects <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ConcurrentHashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4e09\u7ea7\u7f13\u5b58&#xff1a;\u5b58\u653e Bean \u5de5\u5382&#xff0c;\u7528\u4e8e\u751f\u6210\u65e9\u671f Bean \u7684\u4ee3\u7406\u5bf9\u8c61<\/span><br \/>\n<span class=\"token keyword\">private<\/span> <span class=\"token keyword\">final<\/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\">ObjectFactory<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> singletonFactories <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">HashMap<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">16<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u4e09\u3001\u89e3\u51b3\u5faa\u73af\u4f9d\u8d56\u7684\u6d41\u7a0b<\/h3>\n<p>\u4ee5 A\u3001B \u76f8\u4e92\u4f9d\u8d56\u4e3a\u4f8b&#xff1a;<\/p>\n<h4>1. \u521b\u5efa A \u7684\u5b9e\u4f8b<\/h4>\n<p><span class=\"token comment\">\/\/ 1. \u5b9e\u4f8b\u5316 A&#xff08;\u8c03\u7528\u6784\u9020\u51fd\u6570&#xff09;<\/span><br \/>\n<span class=\"token class-name\">A<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">createBeanInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 2. \u5c06 A \u7684\u5de5\u5382\u653e\u5165\u4e09\u7ea7\u7f13\u5b58<\/span><br \/>\n<span class=\"token function\">addSingletonFactory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token function\">getEarlyBeanReference<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a&#034;<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>2. \u586b\u5145 A \u7684\u5c5e\u6027&#xff08;\u53d1\u73b0\u4f9d\u8d56 B&#xff09;<\/h4>\n<p><span class=\"token comment\">\/\/ 3. \u5c1d\u8bd5\u83b7\u53d6 B<\/span><br \/>\n<span class=\"token class-name\">B<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getBean<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;b&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>3. \u521b\u5efa B \u7684\u5b9e\u4f8b<\/h4>\n<p><span class=\"token comment\">\/\/ 4. \u5b9e\u4f8b\u5316 B<\/span><br \/>\n<span class=\"token class-name\">B<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">createBeanInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;b&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 5. \u5c06 B \u7684\u5de5\u5382\u653e\u5165\u4e09\u7ea7\u7f13\u5b58<\/span><br \/>\n<span class=\"token function\">addSingletonFactory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;b&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token function\">getEarlyBeanReference<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;b&#034;<\/span><span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>4. \u586b\u5145 B \u7684\u5c5e\u6027&#xff08;\u53d1\u73b0\u4f9d\u8d56 A&#xff09;<\/h4>\n<p><span class=\"token comment\">\/\/ 6. \u5c1d\u8bd5\u83b7\u53d6 A<\/span><br \/>\n<span class=\"token class-name\">A<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getBean<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 7. \u4ece\u4e09\u7ea7\u7f13\u5b58\u83b7\u53d6 A \u7684\u5de5\u5382&#xff0c;\u521b\u5efa\u65e9\u671f\u5f15\u7528<\/span><br \/>\n<span class=\"token class-name\">ObjectFactory<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> factory <span class=\"token operator\">&#061;<\/span> singletonFactories<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">A<\/span> earlyA <span class=\"token operator\">&#061;<\/span> factory<span class=\"token punctuation\">.<\/span><span class=\"token function\">getObject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 8. \u5c06\u65e9\u671f A \u4ece\u4e09\u7ea7\u7f13\u5b58\u79fb\u5230\u4e8c\u7ea7\u7f13\u5b58<\/span><br \/>\nearlySingletonObjects<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a&#034;<\/span><span class=\"token punctuation\">,<\/span> earlyA<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nsingletonFactories<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>5. \u5b8c\u6210 B \u7684\u521b\u5efa<\/h4>\n<p><span class=\"token comment\">\/\/ 9. B \u521d\u59cb\u5316\u5b8c\u6210&#xff0c;\u653e\u5165\u4e00\u7ea7\u7f13\u5b58<\/span><br \/>\n<span class=\"token function\">addSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;b&#034;<\/span><span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>6. \u5b8c\u6210 A \u7684\u521b\u5efa<\/h4>\n<p><span class=\"token comment\">\/\/ 10. A \u83b7\u53d6\u5230 B&#xff0c;\u586b\u5145\u5c5e\u6027\u5b8c\u6210<\/span><br \/>\n<span class=\"token comment\">\/\/ 11. A \u521d\u59cb\u5316\u5b8c\u6210&#xff0c;\u653e\u5165\u4e00\u7ea7\u7f13\u5b58<\/span><br \/>\n<span class=\"token function\">addSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a&#034;<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ 12. \u4ece\u4e8c\u7ea7\u7f13\u5b58\u79fb\u9664 A<\/span><br \/>\nearlySingletonObjects<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h3>\u56db\u3001\u6838\u5fc3\u6e90\u7801\u5206\u6790<\/h3>\n<h4>1. getBean() \u65b9\u6cd5<\/h4>\n<p><span class=\"token keyword\">protected<\/span> <span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token class-name\">T<\/span> <span class=\"token function\">doGetBean<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Class<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> requiredType<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ 1. \u5c1d\u8bd5\u4ece\u7f13\u5b58\u83b7\u53d6<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> sharedInstance <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getSingleton<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sharedInstance <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 keyword\">return<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">T<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token function\">getObjectForBeanInstance<\/span><span class=\"token punctuation\">(<\/span>sharedInstance<span class=\"token punctuation\">,<\/span> name<span class=\"token punctuation\">,<\/span> beanName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 2. \u521b\u5efa Bean \u5b9e\u4f8b<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token function\">createBean<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> mbd<span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2. getSingleton() \u65b9\u6cd5&#xff08;\u5173\u952e&#xff09;<\/h4>\n<p><span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">getSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> beanName<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">boolean<\/span> allowEarlyReference<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ 1. \u4ece\u4e00\u7ea7\u7f13\u5b58\u83b7\u53d6<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> singletonObject <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>singletonObjects<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 2. \u4e00\u7ea7\u7f13\u5b58\u6ca1\u6709&#xff0c;\u4e14\u5f53\u524d Bean \u6b63\u5728\u521b\u5efa\u4e2d<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>singletonObject <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token function\">isSingletonCurrentlyInCreation<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ 3. \u4ece\u4e8c\u7ea7\u7f13\u5b58\u83b7\u53d6<\/span><br \/>\n        singletonObject <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>earlySingletonObjects<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 4. \u4e8c\u7ea7\u7f13\u5b58\u6ca1\u6709&#xff0c;\u4e14\u5141\u8bb8\u65e9\u671f\u5f15\u7528<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>singletonObject <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span> <span class=\"token operator\">&amp;&amp;<\/span> allowEarlyReference<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>singletonObjects<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token comment\">\/\/ 5. \u53cc\u91cd\u68c0\u67e5<\/span><br \/>\n                singletonObject <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>singletonObjects<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>singletonObject <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                    singletonObject <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>earlySingletonObjects<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>singletonObject <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token comment\">\/\/ 6. \u4ece\u4e09\u7ea7\u7f13\u5b58\u83b7\u53d6\u5de5\u5382<\/span><br \/>\n                        <span class=\"token class-name\">ObjectFactory<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> singletonFactory <span class=\"token operator\">&#061;<\/span><br \/>\n                            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>singletonFactories<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>singletonFactory <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 comment\">\/\/ 7. \u8c03\u7528\u5de5\u5382\u65b9\u6cd5\u83b7\u53d6\u65e9\u671f Bean<\/span><br \/>\n                            singletonObject <span class=\"token operator\">&#061;<\/span> singletonFactory<span class=\"token punctuation\">.<\/span><span class=\"token function\">getObject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                            <span class=\"token comment\">\/\/ 8. \u653e\u5165\u4e8c\u7ea7\u7f13\u5b58<\/span><br \/>\n                            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>earlySingletonObjects<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> singletonObject<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                            <span class=\"token comment\">\/\/ 9. \u4ece\u4e09\u7ea7\u7f13\u5b58\u79fb\u9664<\/span><br \/>\n                            <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>singletonFactories<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token punctuation\">}<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                <span class=\"token punctuation\">}<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> singletonObject<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. createBean() \u65b9\u6cd5<\/h4>\n<p><span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">createBean<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> beanName<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">RootBeanDefinition<\/span> mbd<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Object<\/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 comment\">\/\/ 1. \u5b9e\u4f8b\u5316 Bean<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> beanInstance <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">doCreateBean<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> mbdToUse<span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> beanInstance<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">doCreateBean<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> beanName<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">RootBeanDefinition<\/span> mbd<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Object<\/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 comment\">\/\/ 1. \u5b9e\u4f8b\u5316<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> bean <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">createBeanInstance<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> mbd<span class=\"token punctuation\">,<\/span> args<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 2. \u5141\u8bb8\u5faa\u73af\u4f9d\u8d56&#xff0c;\u5c06\u5de5\u5382\u653e\u5165\u4e09\u7ea7\u7f13\u5b58<\/span><br \/>\n    <span class=\"token keyword\">boolean<\/span> earlySingletonExposure <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>mbd<span class=\"token punctuation\">.<\/span><span class=\"token function\">isSingleton<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>allowCircularReferences <span class=\"token operator\">&amp;&amp;<\/span><br \/>\n        <span class=\"token function\">isSingletonCurrentlyInCreation<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>earlySingletonExposure<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">addSingletonFactory<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token function\">getEarlyBeanReference<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> mbd<span class=\"token punctuation\">,<\/span> bean<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 comment\">\/\/ 3. \u586b\u5145\u5c5e\u6027&#xff08;\u53ef\u80fd\u89e6\u53d1\u5faa\u73af\u4f9d\u8d56&#xff09;<\/span><br \/>\n    <span class=\"token function\">populateBean<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> mbd<span class=\"token punctuation\">,<\/span> bean<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 4. \u521d\u59cb\u5316<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> exposedObject <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">initializeBean<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> exposedObject<span class=\"token punctuation\">,<\/span> mbd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ 5. \u653e\u5165\u4e00\u7ea7\u7f13\u5b58<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>earlySingletonExposure<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Object<\/span> earlySingletonReference <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">getSingleton<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>earlySingletonReference <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            exposedObject <span class=\"token operator\">&#061;<\/span> earlySingletonReference<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">addSingleton<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> exposedObject<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">return<\/span> exposedObject<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u4e94\u3001\u4e3a\u4ec0\u4e48\u9700\u8981\u4e09\u7ea7\u7f13\u5b58<\/h3>\n<h4>\u4e00\u7ea7\u7f13\u5b58\u4e0d\u591f\u5417&#xff1f;<\/h4>\n<ul>\n<li>\u4e00\u7ea7\u7f13\u5b58\u53ea\u5b58\u653e\u5b8c\u6574\u7684 Bean&#xff0c;\u5faa\u73af\u4f9d\u8d56\u65f6 Bean \u8fd8\u672a\u521b\u5efa\u5b8c\u6210<\/li>\n<\/ul>\n<h4>\u4e8c\u7ea7\u7f13\u5b58\u4e0d\u591f\u5417&#xff1f;<\/h4>\n<ul>\n<li>\u4e8c\u7ea7\u7f13\u5b58\u53ef\u4ee5\u89e3\u51b3\u7b80\u5355\u5faa\u73af\u4f9d\u8d56<\/li>\n<li>\u4f46\u5f53\u6d89\u53ca AOP \u4ee3\u7406\u65f6&#xff0c;\u9700\u8981\u4e09\u7ea7\u7f13\u5b58\u6765\u5ef6\u8fdf\u521b\u5efa\u4ee3\u7406\u5bf9\u8c61<\/li>\n<\/ul>\n<h4>\u4e09\u7ea7\u7f13\u5b58\u7684\u4f5c\u7528<\/h4>\n<p><span class=\"token comment\">\/\/ \u4e09\u7ea7\u7f13\u5b58\u5b58\u653e\u7684\u662f\u5de5\u5382&#xff0c;\u53ef\u4ee5\u5ef6\u8fdf\u521b\u5efa\u4ee3\u7406\u5bf9\u8c61<\/span><br \/>\n<span class=\"token function\">addSingletonFactory<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token function\">getEarlyBeanReference<\/span><span class=\"token punctuation\">(<\/span>beanName<span class=\"token punctuation\">,<\/span> mbd<span class=\"token punctuation\">,<\/span> bean<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">Object<\/span> <span class=\"token function\">getEarlyBeanReference<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> beanName<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">RootBeanDefinition<\/span> mbd<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Object<\/span> bean<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">Object<\/span> exposedObject <span class=\"token operator\">&#061;<\/span> bean<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5982\u679c\u9700\u8981 AOP \u4ee3\u7406&#xff0c;\u5728\u8fd9\u91cc\u521b\u5efa\u4ee3\u7406\u5bf9\u8c61<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>mbd<span class=\"token punctuation\">.<\/span><span class=\"token function\">isSynthetic<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> <span class=\"token function\">hasInstantiationAwareBeanPostProcessors<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">BeanPostProcessor<\/span> bp <span class=\"token operator\">:<\/span> <span class=\"token function\">getBeanPostProcessors<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>bp <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">SmartInstantiationAwareBeanPostProcessor<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token class-name\">SmartInstantiationAwareBeanPostProcessor<\/span> ibp <span class=\"token operator\">&#061;<\/span><br \/>\n                    <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">SmartInstantiationAwareBeanPostProcessor<\/span><span class=\"token punctuation\">)<\/span> bp<span class=\"token punctuation\">;<\/span><br \/>\n                exposedObject <span class=\"token operator\">&#061;<\/span> ibp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getEarlyBeanReference<\/span><span class=\"token punctuation\">(<\/span>exposedObject<span class=\"token punctuation\">,<\/span> beanName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> exposedObject<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u516d\u3001\u5faa\u73af\u4f9d\u8d56\u7684\u9650\u5236<\/h3>\n<h4>1. \u53ea\u80fd\u89e3\u51b3\u5355\u4f8b Bean \u7684\u5faa\u73af\u4f9d\u8d56<\/h4>\n<p><span class=\"token comment\">\/\/ \u539f\u578b Bean \u4e0d\u652f\u6301\u5faa\u73af\u4f9d\u8d56<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Scope<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;prototype&#034;<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u4f1a\u629b\u51fa\u5f02\u5e38<\/span><\/p>\n<h4>2. \u6784\u9020\u5668\u6ce8\u5165\u65e0\u6cd5\u89e3\u51b3<\/h4>\n<p><span class=\"token comment\">\/\/ \u6784\u9020\u5668\u6ce8\u5165\u4f1a\u629b\u51fa BeanCurrentlyInCreationException<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Component<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/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\">B<\/span> b<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">B<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>  <span class=\"token comment\">\/\/ \u6784\u9020\u5668\u6ce8\u5165<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>b <span class=\"token operator\">&#061;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. &#064;Async \u6ce8\u89e3\u7684 Bean<\/h4>\n<p><span class=\"token comment\">\/\/ &#064;Async \u4f1a\u5bfc\u81f4\u5faa\u73af\u4f9d\u8d56\u5931\u8d25<\/span><br \/>\n<span class=\"token annotation punctuation\">&#064;Component<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Async<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">method<\/span><span class=\"token punctuation\">(<\/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<h3>\u4e03\u3001\u89e3\u51b3\u65b9\u6848<\/h3>\n<h4>1. \u4f7f\u7528 &#064;Lazy \u6ce8\u89e3&#xff08;\u6784\u9020\u5668\u6ce8\u5165&#xff09;<\/h4>\n<p><span class=\"token annotation punctuation\">&#064;Component<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/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\">B<\/span> b<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">(<\/span><span class=\"token annotation punctuation\">&#064;Lazy<\/span> <span class=\"token class-name\">B<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>  <span class=\"token comment\">\/\/ \u5ef6\u8fdf\u52a0\u8f7d<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>b <span class=\"token operator\">&#061;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2. \u6539\u7528 Setter \u6ce8\u5165<\/h4>\n<p><span class=\"token annotation punctuation\">&#064;Component<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">B<\/span> b<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\">setB<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">B<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>b <span class=\"token operator\">&#061;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u4f7f\u7528 &#064;PostConstruct \u521d\u59cb\u5316<\/h4>\n<p><span class=\"token annotation punctuation\">&#064;Component<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/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\">B<\/span> b<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\">\/\/ \u5728\u8fd9\u91cc\u4f7f\u7528 b<\/span><br \/>\n    <span class=\"token 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