{"id":49008,"date":"2025-07-30T14:44:17","date_gmt":"2025-07-30T06:44:17","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/49008.html"},"modified":"2025-07-30T14:44:17","modified_gmt":"2025-07-30T06:44:17","slug":"%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e4%b9%8b%e5%8d%95%e4%be%8b%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/49008.html","title":{"rendered":"\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u5355\u4f8b\u6a21\u5f0f"},"content":{"rendered":"<p>\u672c\u6587\u4e2d\u6d89\u53ca\u5230\u7684\u5b8c\u6574\u4ee3\u7801\u5b58\u653e\u4e8e\u4ee5\u4e0b GitHub \u4ed3\u5e93\u4e2d LearningCode<\/p>\n<h2>1. \u7406\u8bba\u90e8\u5206<\/h2>\n<p>\u5355\u4f8b\u6a21\u5f0f&#xff08;Singleton Pattern&#xff09;&#xff1a;\u786e\u4fdd\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b&#xff0c;\u5e76\u63d0\u4f9b\u4e00\u4e2a\u5168\u5c40\u8bbf\u95ee\u70b9\u6765\u8bbf\u95ee\u8fd9\u4e2a\u552f\u4e00\u5b9e\u4f8b\u3002<\/p>\n<h3>1.1 \u7ed3\u6784\u4e0e\u5b9e\u73b0<\/h3>\n<p>\u5355\u4f8b\u6a21\u5f0f\u53ea\u5305\u542b\u4e00\u4e2a\u89d2\u8272 \u2014\u2014 Singleton&#xff1a;<\/p>\n<ul>\n<li>\u804c\u8d23&#xff1a;\u8d1f\u8d23\u521b\u5efa\u5b83\u81ea\u5df1\u7684\u552f\u4e00\u5b9e\u4f8b&#xff0c;\u5e76\u5141\u8bb8\u5916\u90e8\u8bbf\u95ee\u5b83\u7684\u552f\u4e00\u5b9e\u4f8b\u3002<\/li>\n<li>\u5b9e\u73b0&#xff1a;Singleton \u4e00\u822c\u58f0\u660e\u4e3a\u7c7b\u3002Singleton \u5728\u5185\u90e8\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u578b\u4e3a Singleton \u7684\u9759\u6001\u5bf9\u8c61&#xff0c;\u7528\u4e8e\u6307\u5411\u4f9b\u5916\u90e8\u5171\u4eab\u8bbf\u95ee\u7684\u552f\u4e00\u5b9e\u4f8b\u3002\u4e3a\u4e86\u9632\u6b62\u5728\u5916\u90e8\u5bf9\u5355\u4f8b\u7c7b\u5b9e\u4f8b\u5316&#xff0c;Sington \u4f1a\u5c06\u5176\u6784\u9020\u51fd\u6570\u7684\u53ef\u89c1\u6027\u8bbe\u4e3a\u79c1\u6709\u3002Singleton \u4f1a\u5728\u5176\u5185\u90e8\u521b\u5efa\u5b83\u7684\u552f\u4e00\u5b9e\u4f8b&#xff0c;\u5e76\u901a\u8fc7\u7c7b\u65b9\u6cd5 getInstance() \u8ba9\u5ba2\u6237\u7aef\u4f7f\u7528\u5b83\u7684\u552f\u4e00\u5b9e\u4f8b\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u552f\u4e00\u5b9e\u4f8b\u7684\u521b\u5efa\u65f6\u673a\u8fdb\u884c\u533a\u5206&#xff0c;\u5355\u4f8b\u6a21\u5f0f\u5206\u4e3a\u4ee5\u4e0b\u4e24\u79cd&#xff1a;<\/p>\n<ul>\n<li>\u997f\u6c49\u5f0f\u5355\u4f8b<\/li>\n<li>\u61d2\u6c49\u5f0f\u5355\u4f8b<\/li>\n<\/ul>\n<h4>1.1.1 \u997f\u6c49\u5f0f\u5355\u4f8b<\/h4>\n<p>\u997f\u6c49\u5f0f\u5355\u4f8b\u7c7b\u5728\u7c7b\u88ab\u52a0\u8f7d\u65f6\u5c31\u5c06\u81ea\u5df1\u5b9e\u4f8b\u5316&#xff1a;<\/p>\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u5b9e\u73b0\u7b80\u5355&#xff0c;\u65e0\u987b\u8003\u8651\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u7684\u95ee\u9898&#xff0c;\u53ef\u4ee5\u786e\u4fdd\u5b9e\u4f8b\u7684\u552f\u4e00\u6027\u3002<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u65e0\u8bba\u7cfb\u7edf\u5728\u8fd0\u884c\u65f6\u662f\u5426\u9700\u8981\u4f7f\u7528\u8be5\u5355\u4f8b\u5bf9\u8c61&#xff0c;\u7531\u4e8e\u5728\u7c7b\u52a0\u8f7d\u65f6\u8be5\u5bf9\u8c61\u5c31\u9700\u8981\u521b\u5efa&#xff0c;\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u4f1a\u5bfc\u81f4\u8d44\u6e90\u6d6a\u8d39\u3002<\/li>\n<\/ul>\n<p>\u997f\u6c49\u5f0f\u5355\u4f8b\u5728\u5b9e\u73b0\u4e0a\u53ef\u4ee5\u91c7\u7528\u7684\u65b9\u5f0f\u6709&#xff1a;\u9759\u6001\u8d4b\u503c\u3001\u9759\u6001\u4ee3\u7801\u5757\u3001\u679a\u4e3e\u7c7b\u7b49\u3002\u4ee5\u4e0b\u5c55\u793a\u7684\u997f\u6c49\u5f0f\u5355\u4f8b\u7684 UML \u7c7b\u56fe\u5c31\u662f\u91c7\u7528\u9759\u6001\u8d4b\u503c\u7684\u65b9\u5f0f&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730064414-6889bf3e44299.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>1.1.2 \u61d2\u6c49\u5f0f\u5355\u4f8b<\/h4>\n<p>\u61d2\u6c49\u5f0f\u5355\u4f8b\u7c7b\u5728 getInstance \u65b9\u6cd5\u7b2c\u4e00\u6b21\u88ab\u8c03\u7528\u65f6\u5c06\u81ea\u5df1\u5b9e\u4f8b\u5316&#xff1a;<\/p>\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u5b9e\u73b0\u4e86\u5ef6\u8fdf\u52a0\u8f7d\u3002<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u5b9e\u73b0\u590d\u6742&#xff0c;\u9700\u8981\u5904\u7406\u591a\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u7684\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p>\u61d2\u6c49\u5f0f\u5355\u4f8b\u5728\u5b9e\u73b0\u4e0a\u53ef\u4ee5\u91c7\u7528\u7684\u65b9\u5f0f\u6709&#xff1a;\u9501\u63a7\u5236&#xff0c;IoDH&#xff08;\u4f9d\u8d56\u4e8e\u8bed\u8a00\u7279\u6027&#xff0c;\u4f8b\u5982 Java \u4e2d\u7684\u9759\u6001\u5185\u90e8\u7c7b&#xff09;\u3002<\/p>\n<p>\u4ee5\u4e0b\u5c55\u793a\u7684\u61d2\u6c49\u5f0f\u5355\u4f8b\u7684 UML \u7c7b\u56fe\u7701\u7565\u4e86\u5904\u7406\u591a\u4e2a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\u7684\u4ee3\u7801&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730064414-6889bf3e827af.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>1.2 \u6269\u5c55&#xff1a;\u521b\u5efa\u5355\u4f8b\u7c7b\u7684\u5b50\u7c7b<\/h3>\n<p>\u5f53\u552f\u4e00\u5b9e\u4f8b\u7684\u7c7b\u578b\u53ef\u80fd\u662f\u5355\u4f8b\u7c7b&#xff0c;\u4e5f\u53ef\u80fd\u662f\u5355\u4f8b\u7c7b\u7684\u5b50\u7c7b\u65f6&#xff0c;\u5373\u9700\u8981\u83b7\u53d6\u5355\u4f8b\u7c7b\u53ca\u5176\u5b50\u7c7b\u7684\u552f\u4e00\u5b9e\u4f8b&#xff0c;\u9700\u8981\u5bf9\u5355\u4f8b\u6a21\u5f0f\u8fdb\u884c\u6269\u5c55\u3002\u5b9e\u73b0\u4e0a\u8ff0\u76ee\u6807\u4e00\u822c\u6709\u4ee5\u4e0b 3 \u79cd\u65b9\u5f0f&#xff1a;<\/p>\n<ul>\n<li>\u5728 getInstance \u65b9\u6cd5\u4e2d\u786c\u7f16\u7801\u6240\u6709\u53ef\u80fd\u7684\u5355\u4f8b\u7c7b&#xff0c;\u901a\u8fc7\u73af\u5883\u53d8\u91cf\u6216\u914d\u7f6e\u6587\u4ef6\u7684\u65b9\u5f0f\u52a8\u6001\u6307\u5b9a\u5355\u4f8b\u7c7b\u3002\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u5b9e\u73b0\u7b80\u5355\u3002<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u786c\u6027\u9650\u5b9a\u4e86\u53ef\u80fd\u7684\u5355\u4f8b\u7c7b\u96c6\u5408&#xff0c;\u4e0d\u591f\u7075\u6d3b\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5728\u7f16\u8bd1\u65f6\u94fe\u63a5\u6307\u5b9a\u5355\u4f8b\u7c7b\u3002\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u4e0d\u9700\u8981\u5728 getInstance \u65b9\u6cd5\u4e2d\u786c\u7f16\u7801\u6240\u6709\u53ef\u80fd\u7684\u5355\u4f8b\u7c7b\u3002<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u96be\u4ee5\u5728\u8fd0\u884c\u65f6\u9009\u62e9\u5355\u4f8b\u7c7b&#xff0c;\u4e0d\u591f\u7075\u6d3b\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u4f7f\u7528\u5355\u4ef6\u6ce8\u518c\u8868&#xff1a;\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u5c06\u552f\u4e00\u5b9e\u4f8b\u7684\u9009\u62e9\u6743\u4ea4\u7ed9\u4e86\u5916\u90e8&#xff0c;\u56e0\u6b64\u53ef\u4ee5\u5728\u8fd0\u884c\u65f6\u9009\u62e9\u5355\u4f8b\u7c7b&#xff0c;\u8db3\u591f\u7075\u6d3b\u3002<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u5b9e\u73b0\u590d\u6742&#xff0c;\u9700\u8981\u8bbe\u8ba1\u4e00\u79cd\u6ce8\u518c\u673a\u5236\u4f9b\u5355\u4f8b\u7c7b\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u5728\u4e0d\u8003\u8651\u53cd\u5c04\u7684\u60c5\u51b5\u4e0b&#xff0c;\u4e0a\u8ff0\u5355\u4f8b\u7c7b\u53ca\u5176\u5b50\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u7684\u53ef\u89c1\u6027\u4e0d\u4e00\u5b9a\u662f\u79c1\u6709&#xff0c;\u5426\u5219\u53ef\u80fd\u65e0\u6cd5\u521b\u5efa\u552f\u4e00\u5b9e\u4f8b\u3002<\/p>\n<p>\u91cd\u70b9\u4ecb\u7ecd\u5355\u4ef6\u6ce8\u518c\u8868\u3002\u5355\u4ef6\u6ce8\u518c\u8868\u901a\u5e38\u662f\u4e00\u4e2a\u5168\u5c40\u552f\u4e00\u7684\u7ec4\u4ef6&#xff0c;\u5185\u90e8\u7ef4\u62a4\u4e00\u4e2a\u79c1\u6709\u952e\u503c\u5bf9&#xff0c;\u7528\u4e8e\u5728\u552f\u4e00\u6807\u8bc6\u7b26 key\u4e0e\u5bf9\u5e94\u7684\u5355\u4f8b\u5b9e\u4f8b\u4e4b\u95f4\u5efa\u7acb\u6620\u5c04\u5173\u7cfb\u3002\u5355\u4ef6\u6ce8\u518c\u8868\u4e00\u822c\u4f1a\u63d0\u4f9b\u4e24\u7c7b\u6838\u5fc3\u64cd\u4f5c&#xff0c;\u4e00\u7c7b\u64cd\u4f5c\u662f\u6839\u636e key \u67e5\u627e\u6307\u5b9a\u552f\u4e00\u5b9e\u4f8b&#xff0c;\u53e6\u4e00\u7c7b\u64cd\u4f5c\u662f\u5411\u6ce8\u518c\u8868\u4e2d\u6ce8\u518c\u65b0\u7684\u552f\u4e00\u5b9e\u4f8b&#xff1b;\u9664\u6b64\u4e4b\u5916&#xff0c;\u5355\u4ef6\u6ce8\u518c\u8868\u8fd8\u53ef\u4ee5\u63d0\u4f9b\u66ff\u6362\u3001\u5220\u9664\u7b49\u64cd\u4f5c\u3002\u6839\u636e\u6ce8\u518c\u884c\u4e3a\u7684\u53d1\u8d77\u8005\u4e0d\u540c&#xff0c;\u5411\u5355\u4ef6\u6ce8\u518c\u8868\u6ce8\u518c\u5355\u4f8b\u7684\u65b9\u5f0f\u53ef\u5206\u4e3a\u4ee5\u4e0b\u4e24\u7c7b&#xff1a;<\/p>\n<ul>\n<li>\u5355\u4f8b\u7c7b\u53ef\u4ee5\u5728\u7c7b\u52a0\u8f7d\u9636\u6bb5\u4e3b\u52a8\u5411\u6ce8\u518c\u8868\u6ce8\u518c\u81ea\u8eab\u3002<\/li>\n<li>\u5ba2\u6237\u7aef\u5728\u8fd0\u884c\u65f6\u663e\u5f0f\u6ce8\u518c\u6240\u9700\u5355\u4f8b\u5b50\u7c7b\u3002<\/li>\n<\/ul>\n<p>\u57fa\u4e8e\u5355\u4ef6\u6ce8\u518c\u8868\u8fdb\u884c\u6269\u5c55\u7684\u5355\u4f8b\u6a21\u5f0f\u7684\u901a\u7528 UML \u7c7b\u56fe\u5982\u4e0b\u6240\u793a&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730064414-6889bf3ecd4e3.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>1.3 \u6269\u5c55&#xff1a;\u591a\u4f8b\u6a21\u5f0f<\/h3>\n<p>\u591a\u4f8b\u6a21\u5f0f\u662f\u5355\u4f8b\u6a21\u5f0f\u7684\u6269\u5c55&#xff0c;\u5141\u8bb8\u5b58\u5728\u591a\u4e2a\u5b9e\u4f8b&#xff0c;\u4f46\u8fd9\u4e9b\u5b9e\u4f8b\u7684\u6570\u91cf\u662f\u6709\u9650\u5236\u7684&#xff0c;\u5e76\u4e14\u6bcf\u4e2a\u5b9e\u4f8b\u90fd\u901a\u8fc7\u4e00\u4e2a\u552f\u4e00\u7684\u952e\u6765\u6807\u8bc6\u548c\u8bbf\u95ee\u3002 \u4e0e\u5355\u4f8b\u6a21\u5f0f\u4e00\u6837&#xff0c;\u591a\u4f8b\u6a21\u5f0f\u6839\u636e\u5b9e\u4f8b\u7684\u521b\u5efa\u65f6\u673a\u5206\u4e3a\u997f\u6c49\u5f0f\u4e0e\u61d2\u6c49\u5f0f\u3002 \u591a\u4f8b\u6a21\u5f0f\u7684 UML \u7c7b\u56fe\u5982\u4e0b\u6240\u793a&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730064415-6889bf3f553ba.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>1.4 \u4f18\u7f3a\u70b9\u4e0e\u9002\u7528\u573a\u666f<\/h3>\n<p>\u5355\u4f8b\u6a21\u5f0f\u5177\u6709\u4ee5\u4e0b\u4f18\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u5355\u4f8b\u6a21\u5f0f\u63d0\u4f9b\u4e86\u5bf9\u552f\u4e00\u5b9e\u4f8b\u7684\u53d7\u63a7\u8bbf\u95ee\u3002\u56e0\u4e3a\u5355\u4f8b\u7c7b\u5c01\u88c5\u4e86\u5b83\u7684\u552f\u4e00\u5b9e\u4f8b&#xff0c;\u6240\u4ee5\u5b83\u53ef\u4ee5\u4e25\u683c\u63a7\u5236\u5ba2\u6237\u600e\u6837\u4ee5\u53ca\u4f55\u65f6\u8bbf\u95ee\u5b83\u3002<\/li>\n<li>\u4e0e\u5168\u5c40\u53d8\u91cf\u76f8\u6bd4&#xff0c;\u5355\u4f8b\u6a21\u5f0f\u907f\u514d\u4e86\u90a3\u4e9b\u5b58\u50a8\u552f\u4e00\u5b9e\u4f8b\u7684\u5168\u5c40\u53d8\u91cf\u6c61\u67d3\u547d\u540d\u7a7a\u95f4\u3002<\/li>\n<li>\u4e0e\u7c7b\u65b9\u6cd5\u76f8\u6bd4&#xff0c;\u5355\u4f8b\u6a21\u5f0f\u652f\u6301\u901a\u8fc7\u5b50\u7c7b\u5316\u6269\u5c55\u5176\u529f\u80fd&#xff0c;\u4ece\u800c\u5141\u8bb8\u5728\u4e0d\u4fee\u6539\u539f\u6709\u5b9e\u73b0\u7684\u524d\u63d0\u4e0b\u7075\u6d3b\u91cd\u5b9a\u4e49\u5176\u884c\u4e3a\u3002<\/li>\n<li>\u5141\u8bb8\u53ef\u53d8\u6570\u76ee\u7684\u5b9e\u4f8b\u3002\u57fa\u4e8e\u5355\u4f8b\u6a21\u5f0f\u53ef\u4ee5\u8fdb\u884c\u6269\u5c55&#xff0c;\u4f7f\u7528\u4e0e\u63a7\u5236\u5355\u4f8b\u5bf9\u8c61\u76f8\u4f3c\u7684\u65b9\u6cd5\u6765\u83b7\u5f97\u6307\u5b9a\u4e2a\u6570\u7684\u5b9e\u4f8b\u5bf9\u8c61&#xff0c;\u65e2\u8282\u7701\u7cfb\u7edf\u8d44\u6e90&#xff0c;\u53c8\u89e3\u51b3\u4e86\u7531\u4e8e\u5355\u4f8b\u5bf9\u8c61\u5171\u4eab\u8fc7\u591a\u6709\u635f\u6027\u80fd\u7684\u95ee\u9898\u3002<\/li>\n<\/ul>\n<p>\u5355\u4f8b\u6a21\u5f0f\u5b58\u5728\u4ee5\u4e0b\u7f3a\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u7531\u4e8e\u5355\u4f8b\u6a21\u5f0f\u4e2d\u6ca1\u6709\u62bd\u8c61\u5c42&#xff0c;\u56e0\u6b64\u5355\u4f8b\u7c7b\u7684\u6269\u5c55\u6709\u5f88\u5927\u7684\u56f0\u96be\u3002<\/li>\n<li>\u5355\u4f8b\u7c7b\u7684\u804c\u8d23\u8fc7\u91cd&#xff0c;\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u8fdd\u80cc\u4e86\u5355\u4e00\u804c\u8d23\u539f\u5219\u3002\u56e0\u4e3a\u5355\u4f8b\u7c7b\u65e2\u63d0\u4f9b\u4e86\u4e1a\u52a1\u65b9\u6cd5&#xff0c;\u53c8\u63d0\u4f9b\u4e86\u521b\u5efa\u5bf9\u8c61\u7684\u65b9\u6cd5&#xff0c;\u5c06\u5bf9\u8c61\u7684\u521b\u5efa\u548c\u5bf9\u8c61\u672c\u8eab\u7684\u529f\u80fd\u8026\u5408\u5728\u4e00\u8d77\u3002<\/li>\n<\/ul>\n<p>\u5355\u4f8b\u6a21\u5f0f\u9002\u7528\u4e8e\u4ee5\u4e0b\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>\u5f53\u7c7b\u53ea\u80fd\u6709\u4e00\u4e2a\u5b9e\u4f8b\u800c\u4e14\u7cfb\u7edf\u8c03\u7528\u7c7b\u7684\u5355\u4e2a\u5b9e\u4f8b\u53ea\u5141\u8bb8\u4f7f\u7528\u4e00\u4e2a\u516c\u5171\u8bbf\u95ee\u70b9\u65f6\u3002<\/li>\n<li>\u5f53\u7cfb\u7edf\u6240\u9700\u7684\u552f\u4e00\u5b9e\u4f8b\u5e94\u8be5\u662f\u901a\u8fc7\u5b50\u7c7b\u5316\u53ef\u6269\u5c55\u7684&#xff0c;\u5e76\u4e14\u5ba2\u6237\u5e94\u8be5\u65e0\u987b\u66f4\u6539\u4ee3\u7801\u5c31\u80fd\u4f7f\u7528\u4e00\u4e2a\u6269\u5c55\u7684\u5b9e\u4f8b\u65f6\u3002<\/li>\n<\/ul>\n<h2>2. \u5b9e\u73b0\u90e8\u5206<\/h2>\n<p>\u4ee5 Java \u4ee3\u7801\u4e3a\u4f8b&#xff0c;\u6f14\u793a\u5355\u4f8b\u6a21\u5f0f\u53ca\u5176\u6269\u5c55\u7684\u5b9e\u73b0\u3002<\/p>\n<h3>2.1 Java 5 \u79cd\u5355\u4f8b\u6a21\u5f0f\u7684\u5b9e\u73b0<\/h3>\n<p>\u8bf7\u53c2\u8003\u6587\u7ae0 \u5355\u4f8b\u6a21\u5f0f\u4e0e Volidate\u7684\u5b66\u4e60 \u2014\u2014 \u6211\u7231\u5b66\u4e60\u5440<\/p>\n<h3>2.2 \u6269\u5c55&#xff1a;\u521b\u5efa\u5355\u4f8b\u7c7b\u7684\u5b50\u7c7b<\/h3>\n<p>\u6848\u4f8b\u4ecb\u7ecd&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730064415-6889bf3fa575c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h4>2.2.1 \u65b9\u5f0f\u4e00<\/h4>\n<p>getInstance \u4e2d\u786c\u7f16\u7801\u6240\u6709\u53ef\u80fd\u7684\u5355\u4f8b\u7c7b\u3002<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LoadBalancer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">volatile<\/span> <span class=\"token class-name\">LoadBalancer<\/span> INSTANCE<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">String<\/span> ENV_TYPE <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Load_Balancer_TYPE&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">protected<\/span> <span class=\"token class-name\">LoadBalancer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">LoadBalancer<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">LoadBalancer<\/span> localRef <span class=\"token operator\">&#061;<\/span> INSTANCE<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>localRef <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 keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">LoadBalancer<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                localRef <span class=\"token operator\">&#061;<\/span> INSTANCE<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>localRef <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 class-name\">String<\/span> className <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getenv<\/span><span class=\"token punctuation\">(<\/span>ENV_TYPE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>className <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 keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalArgumentException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Environment variable not set or invalid: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> ENV_TYPE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><br \/>\n                    localRef <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>className<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">case<\/span> <span class=\"token string\">&#034;ROUND&#034;<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RoundLoadBalancer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">case<\/span> <span class=\"token string\">&#034;RANDOM&#034;<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RandomLoadBalancer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">case<\/span> <span class=\"token string\">&#034;LEAST_CONNECTION&#034;<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">LeastConnectionLoadBalancer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">case<\/span> <span class=\"token string\">&#034;IP_HASH&#034;<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IpHashLoadBalancer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        <span class=\"token keyword\">default<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalArgumentException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Unsupported load balancer type: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> className<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    INSTANCE <span class=\"token operator\">&#061;<\/span> localRef<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><\/p>\n<p>        <span class=\"token keyword\">return<\/span> localRef<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">addServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> server<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">removeServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> server<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getServer<\/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<h4>2.2.2 \u65b9\u5f0f\u4e8c<\/h4>\n<p>Java \u4e2d\u4e0d\u80fd\u50cf C&#043;&#043; \u4e00\u6837\u5728\u7f16\u8bd1\u65f6\u5c06\u5b50\u7c7b\u7684\u7c7b\u578b\u7ed1\u5b9a\u5230\u552f\u4e00\u5b9e\u4f8b\u4e0a&#xff0c;\u8fd9\u91cc\u4f7f\u7528 ServiceLoader \u673a\u5236\u6765\u6a21\u4eff\u8be5\u884c\u4e3a\u3002<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ServiceLoader<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LoadBalancer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">volatile<\/span> <span class=\"token class-name\">LoadBalancer<\/span> INSTANCE<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">LoadBalancer<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">LoadBalancer<\/span> localRef <span class=\"token operator\">&#061;<\/span> INSTANCE<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>localRef <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 keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">LoadBalancer<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                localRef <span class=\"token operator\">&#061;<\/span> INSTANCE<span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>localRef <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 class-name\">ServiceLoader<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LoadBalancer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> loader <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">ServiceLoader<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">load<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">LoadBalancer<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    localRef <span class=\"token operator\">&#061;<\/span> loader<span class=\"token punctuation\">.<\/span><span class=\"token function\">findFirst<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                            <span class=\"token punctuation\">.<\/span><span class=\"token function\">orElseThrow<\/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 keyword\">new<\/span> <span class=\"token class-name\">IllegalStateException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;No LoadBalancer implementation found&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    INSTANCE <span class=\"token operator\">&#061;<\/span> localRef<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><\/p>\n<p>        <span class=\"token keyword\">return<\/span> localRef<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">addServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> server<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">removeServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> server<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getServer<\/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<h4>2.2.3 \u65b9\u5f0f\u4e09<\/h4>\n<p>\u4f7f\u7528\u5355\u4ef6\u6ce8\u518c\u8868\u3002\u8be5\u8bbe\u8ba1\u65b9\u6848\u4e3a&#xff1a;\u7236\u7c7b LoadBalancer \u4ec5\u63d0\u4f9b\u4e00\u4e2a getInstance \u4f5c\u4e3a\u552f\u4e00\u5b9e\u4f8b\u7684\u5168\u5c40\u8bbf\u95ee\u70b9&#xff0c; \u5b50\u7c7b\u5728\u9759\u6001\u4ee3\u7801\u5757\u4e2d\u5411\u6ce8\u518c\u8868\u6ce8\u518c\u81ea\u8eab&#xff0c;\u5916\u90e8\u5ba2\u6237\u7aef\u52a0\u8f7d\u6307\u5b9a\u5b50\u7c7b\u5373\u53ef\u5728\u8fd0\u884c\u671f\u95f4\u6307\u5b9a\u552f\u4e00\u5b9e\u4f8b\u7684\u7c7b\u578b\u3002<\/p>\n<p>\u5355\u4f8b\u7c7b\u4ee3\u7801\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LoadBalancer<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">String<\/span> KEY <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;org.example.case03.LoadBalancer&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">LoadBalancer<\/span> <span class=\"token function\">getInstance<\/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\">SingletonRegistry<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>KEY<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">addServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> server<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">removeServer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> server<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">abstract<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getServer<\/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>\u5355\u4ef6\u6ce8\u518c\u8868\u4ee3\u7801\u5982\u4e0b&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>concurrent<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ConcurrentHashMap<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>concurrent<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ConcurrentMap<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SingletonRegistry<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ConcurrentMap<\/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> INSTANCE_MAP <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 punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> key<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Object<\/span> instance<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        INSTANCE_MAP<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>key<span class=\"token punctuation\">,<\/span> instance<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;SuppressWarnings<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;unchecked&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/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\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> key<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> INSTANCE_MAP<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>key<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>\u5b8c\u6574\u7684 UML \u7c7b\u56fe\u5982\u4e0b\u6240\u793a&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/07\/20250730064416-6889bf4007fe4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>2.3 \u6269\u5c55&#xff1a;\u591a\u4f8b\u6a21\u5f0f<\/h3>\n<p>\u6f14\u793a\u4ee5\u4e0b 2 \u79cd\u591a\u4f8b\u6a21\u5f0f\u7684\u7f16\u5199&#xff1a;<\/p>\n<ul>\n<li>\u997f\u6c49\u5f0f<\/li>\n<li>\u61d2\u6c49\u5f0f<\/li>\n<\/ul>\n<h4>2.3.1 \u997f\u6c49\u5f0f<\/h4>\n<p>\u67d0\u516c\u53f8\u5e0c\u671b\u4e3a\u51e0\u4e2a\u56fa\u5b9a\u90e8\u95e8&#xff08;\u5982 HR\u3001IT\u3001Finance&#xff09;\u9884\u5206\u914d\u6253\u5370\u673a\u8d44\u6e90&#xff0c;\u4ee5\u786e\u4fdd\u6bcf\u6b21\u8bf7\u6c42\u90fd\u80fd\u5feb\u901f\u83b7\u53d6\u6253\u5370\u673a\u3002\u56e0\u6b64&#xff0c;\u51b3\u5b9a\u4f7f\u7528\u997f\u6c49\u5f0f\u591a\u4f8b\u6a21\u5f0f\u8bbe\u8ba1\u4e00\u4e2a\u6253\u5370\u673a\u7ba1\u7406\u7cfb\u7edf\u3002\u8be5\u7cfb\u7edf\u5e94\u6ee1\u8db3\u4ee5\u4e0b\u8981\u6c42&#xff1a;<\/p>\n<ul>\n<li>\u5728\u7cfb\u7edf\u542f\u52a8\u65f6&#xff0c;\u9884\u5148\u521b\u5efa\u597d\u6bcf\u4e2a\u90e8\u95e8\u7684\u6253\u5370\u673a\u5b9e\u4f8b\u3002<\/li>\n<li>\u6240\u6709\u6253\u5370\u673a\u5b9e\u4f8b\u5b58\u50a8\u5728\u4e00\u4e2a\u6ce8\u518c\u8868\u4e2d\u3002<\/li>\n<li>\u6bcf\u4e2a\u90e8\u95e8\u53ea\u80fd\u62e5\u6709\u4e00\u4e2a\u6253\u5370\u673a\u5b9e\u4f8b&#xff08;\u901a\u8fc7\u90e8\u95e8\u540d\u79f0\u552f\u4e00\u6807\u8bc6&#xff09;\u3002<\/li>\n<li>\u8bf7\u6c42\u6253\u5370\u673a\u65f6&#xff0c;\u76f4\u63a5\u4ece\u6ce8\u518c\u8868\u4e2d\u83b7\u53d6&#xff0c;\u4e0d\u91cd\u65b0\u521b\u5efa\u3002<\/li>\n<li>\u7cfb\u7edf\u652f\u6301\u56fa\u5b9a\u7684\u51e0\u4e2a\u90e8\u95e8&#xff0c;\u4e0d\u652f\u6301\u52a8\u6001\u6dfb\u52a0\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>concurrent<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ConcurrentHashMap<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>concurrent<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ConcurrentMap<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PrinterManager<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ConcurrentMap<\/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\">Printer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> MAP <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 punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        MAP<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4eba\u529b\u8d44\u6e90\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Printer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4eba\u529b\u8d44\u6e90\u90e8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        MAP<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8d22\u52a1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Printer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8d22\u52a1\u90e8&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        MAP<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u9500\u552e\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Printer<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u9500\u552e\u90e8&#034;<\/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 keyword\">private<\/span> <span class=\"token class-name\">PrinterManager<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Printer<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> departmentName<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Printer<\/span> printer <span class=\"token operator\">&#061;<\/span> MAP<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>departmentName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>printer <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 keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RuntimeException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;No printer is available for department: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> departmentName <span class=\"token operator\">&#043;<\/span><br \/>\n                    <span class=\"token string\">&#034;. Only predefined departments are supported.&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> printer<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2.3.2 \u61d2\u6c49\u5f0f<\/h4>\n<p>\u5728\u4e00\u5bb6\u5927\u578b\u516c\u53f8\u4e2d&#xff0c;\u6bcf\u4e2a\u90e8\u95e8&#xff08;\u5982 HR\u3001IT\u3001Finance&#xff09;\u90fd\u9700\u8981\u4e00\u53f0\u6253\u5370\u673a\u3002\u4e3a\u4e86\u8282\u7701\u7cfb\u7edf\u8d44\u6e90&#xff0c;\u516c\u53f8\u51b3\u5b9a\u4f7f\u7528\u61d2\u6c49\u5f0f\u591a\u4f8b\u6a21\u5f0f\u8bbe\u8ba1\u4e00\u4e2a\u6253\u5370\u673a\u7ba1\u7406\u7cfb\u7edf\u3002\u8be5\u7cfb\u7edf\u5e94\u6ee1\u8db3\u4ee5\u4e0b\u8981\u6c42&#xff1a;<\/p>\n<ul>\n<li>\u6bcf\u4e2a\u90e8\u95e8\u53ea\u80fd\u62e5\u6709\u4e00\u4e2a\u6253\u5370\u673a\u5b9e\u4f8b&#xff08;\u901a\u8fc7\u90e8\u95e8\u540d\u79f0\u552f\u4e00\u6807\u8bc6&#xff09;\u3002<\/li>\n<li>\u6253\u5370\u673a\u5b9e\u4f8b\u5e94\u6309\u9700\u521b\u5efa&#xff0c;\u5373\u53ea\u6709\u5728\u7b2c\u4e00\u6b21\u8bf7\u6c42\u8be5\u90e8\u95e8\u7684\u6253\u5370\u673a\u65f6\u624d\u521b\u5efa\u3002<\/li>\n<li>\u6240\u6709\u90e8\u95e8\u7684\u6253\u5370\u673a\u90fd\u901a\u8fc7\u4e00\u4e2a\u7edf\u4e00\u7684\u7ba1\u7406\u7c7b\u6765\u83b7\u53d6\u3002<\/li>\n<li>\u7cfb\u7edf\u652f\u6301\u591a\u4e2a\u90e8\u95e8&#xff0c;\u4f46\u6bcf\u4e2a\u90e8\u95e8\u7684\u6253\u5370\u673a\u5b9e\u4f8b\u53ea\u80fd\u6709\u4e00\u4e2a\u3002<\/li>\n<li>\u7cfb\u7edf\u9700\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u3002<\/li>\n<\/ul>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>concurrent<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ConcurrentHashMap<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>concurrent<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ConcurrentMap<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PrinterManager<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ConcurrentMap<\/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\">Printer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> MAP <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 punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> MAX_PRINTER_INSTANCES <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">PrinterManager<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Printer<\/span> <span class=\"token function\">getInstance<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> departmentName<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Printer<\/span> printer <span class=\"token operator\">&#061;<\/span> MAP<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>departmentName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>printer <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 keyword\">synchronized<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">PrinterManager<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                printer <span class=\"token operator\">&#061;<\/span> MAP<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span>departmentName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>printer <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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>MAP<span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> MAX_PRINTER_INSTANCES<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        printer <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Printer<\/span><span class=\"token punctuation\">(<\/span>departmentName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                        MAP<span class=\"token punctuation\">.<\/span><span class=\"token function\">put<\/span><span class=\"token punctuation\">(<\/span>departmentName<span class=\"token punctuation\">,<\/span> printer<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                    <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                        <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">RuntimeException<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Department &#039;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> departmentName <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;&#039; cannot get a printer now. &#034;<\/span> <span class=\"token operator\">&#043;<\/span><br \/>\n                                <span class=\"token string\">&#034;All printers are in use. Please wait&#8230;&#034;<\/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><br \/>\n            <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token keyword\">return<\/span> printer<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">releasePrinter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> departmentName<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Printer<\/span> removed <span class=\"token operator\">&#061;<\/span> MAP<span class=\"token punctuation\">.<\/span><span class=\"token function\">remove<\/span><span class=\"token punctuation\">(<\/span>departmentName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>removed <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\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Printer released by department: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> departmentName<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;No printer was assigned to department: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> departmentName<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><\/p>\n<h2>\u53c2\u8003\u8d44\u6599<\/h2>\n<p>\u5b66\u4e60\u89c6\u9891&#xff1a;<\/p>\n<li>\u8bbe\u8ba1\u6a21\u5f0f\u5feb\u901f\u5165\u95e8 \u2014\u2014 \u56fe\u7075\u661f\u7403TuringPlanet \u2014\u2014 \u5355\u4f8b\u6a21\u5f0f<\/li>\n<li>Java\u8bbe\u8ba1\u6a21\u5f0f\u8be6\u89e3 \u2014\u2014 \u9ed1\u9a6c\u7a0b\u5e8f\u5458 \u2014\u2014 \u5355\u4f8b\u6a21\u5f0f&#xff08;P22 ~ P33&#xff09;<\/li>\n<li>Java\u8bbe\u8ba1\u6a21\u5f0f \u2014\u2014 \u5c1a\u7845\u8c37 \u2014\u2014 \u5355\u4f8b\u6a21\u5f0f&#xff08;P29 ~ P38&#xff09;<\/li>\n<p>\u5b66\u4e60\u8bfb\u7269&#xff1a;<\/p>\n<li>\u300a\u8bbe\u8ba1\u6a21\u5f0f&#xff1a;\u53ef\u590d\u7528\u9762\u5411\u5bf9\u8c61\u8f6f\u4ef6\u7684\u57fa\u7840\u300b\u2014\u2014 Erich Gamma \u8457 \u2014\u2014 \u674e\u82f1\u519b \u8bd1 \u2014\u2014 \u7b2c 3.5 \u8282&#xff08;P96&#xff09;<\/li>\n<li>\u300aJava \u8bbe\u8ba1\u6a21\u5f0f\u300b \u2014\u2014 \u5218\u4f1f \u8457 \u2014\u2014 \u7b2c 8 \u7ae0&#xff08;P86&#xff09;<\/li>\n<li>\u300a\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u7f8e\u300b\u2014\u2014 \u738b\u4e89 \u8457 \u2014\u2014 \u7b2c 6.1 \u8282&#xff08;P167&#xff09;<\/li>\n<li>\u300a\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u7985\u300b \u2014\u2014 \u7b2c 2 \u7248 \u2014\u2014 \u79e6\u5c0f\u6ce2 \u8457 \u2014\u2014 \u7b2c 7 \u7ae0&#xff08;P58&#xff09;<\/li>\n<li>\u300a\u56fe\u89e3\u8bbe\u8ba1\u6a21\u5f0f\u300b\u2014\u2014 \u7ed3\u57ce\u6d69 \u8457 \u2014\u2014 \u6768\u6587\u8f69 \u8bd1 \u2014\u2014 \u7b2c 5 \u7ae0&#xff08;P43&#xff09;<\/li>\n<p>\u7535\u5b50\u6587\u732e&#xff1a;<\/p>\n<li>\u8bbe\u8ba1\u6a21\u5f0f\u6559\u7a0b \u2014\u2014 \u83dc\u9e1f\u6559\u7a0b \u2014\u2014 \u5355\u4f8b\u6a21\u5f0f<\/li>\n<li>Threadsafe Singleton Design Pattern Java \u2014\u2014 Upasana<\/li>\n<li>\u5355\u4f8b\u6a21\u5f0f\u4e0e Volidate\u7684\u5b66\u4e60 \u2014\u2014 \u6211\u7231\u5b66\u4e60\u5440<\/li>\n<li>99&#043; \u79cd\u8f6f\u4ef6\u6a21\u5f0f \u2014\u2014 long2ge \u2014\u2014 \u5355\u4f8b\u6a21\u5f0f<\/li>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1k\u6b21\uff0c\u70b9\u8d5e21\u6b21\uff0c\u6536\u85cf11\u6b21\u3002\u672c\u6587\u4ecb\u7ecd\u4e86\u5355\u4f8b\u6a21\u5f0f\u7684\u7406\u8bba\u4e0e\u5b9e\u73b0\uff0c\u91cd\u70b9\u5206\u6790\u4e86\u997f\u6c49\u5f0f\u4e0e\u61d2\u6c49\u5f0f\u5355\u4f8b\u7684\u4f18\u7f3a\u70b9\u53ca\u9002\u7528\u573a\u666f\u3002\u5355\u4f8b\u6a21\u5f0f\u786e\u4fdd\u7c7b\u4ec5\u6709\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u5e76\u63d0\u4f9b\u5168\u5c40\u8bbf\u95ee\u70b9\u3002\u997f\u6c49\u5f0f\u5728\u7c7b\u52a0\u8f7d\u65f6\u5b9e\u4f8b\u5316\uff0c\u5b9e\u73b0\u7b80\u5355\u4f46\u53ef\u80fd\u6d6a\u8d39\u8d44\u6e90\uff1b\u61d2\u6c49\u5f0f\u5ef6\u8fdf\u52a0\u8f7d\u4f46\u9700\u5904\u7406\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u3002\u6587\u7ae0\u8fd8\u63a2\u8ba8\u4e86\u5355\u4f8b\u6a21\u5f0f\u7684\u6269\u5c55\u5e94\u7528\uff0c\u5305\u62ec\u521b\u5efa\u5b50\u7c7b\u5b9e\u4f8b\u7684\u4e09\u79cd\u65b9\u6cd5\uff08\u786c\u7f16\u7801\u3001\u7f16\u8bd1\u94fe\u63a5\u3001\u6ce8\u518c\u8868\uff09\u4ee5\u53ca\u591a\u4f8b\u6a21\u5f0f\u3002\u6700\u540e\u901a\u8fc7 Java \u4ee3\u7801\u8fdb\u884c\u6f14\u793a\u3002_\u8bbe\u8ba1\u6a21\u5f0f \u5355\u4f8b<\/p>\n","protected":false},"author":2,"featured_media":49002,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2246,2874],"topic":[],"class_list":["post-49008","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-2246","tag-2874"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u8bbe\u8ba1\u6a21\u5f0f\u4e4b\u5355\u4f8b\u6a21\u5f0f - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/49008.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" 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