{"id":557,"date":"2023-05-04T02:14:16","date_gmt":"2023-02-28T03:49:37","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/java%e4%be%9d%e8%b5%96%e6%b3%a8%e5%85%a5-di%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e7%a4%ba%e4%be%8b%e6%95%99%e7%a8%8b\/"},"modified":"2025-08-02T18:23:06","modified_gmt":"2025-08-02T10:23:06","slug":"java%e4%be%9d%e8%b5%96%e6%b3%a8%e5%85%a5-di%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e7%a4%ba%e4%be%8b%e6%95%99%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e4%be%9d%e8%b5%96%e6%b3%a8%e5%85%a5-di%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f%e7%a4%ba%e4%be%8b%e6%95%99%e7%a8%8b\/","title":{"rendered":"Java\u4f9d\u8d56\u6ce8\u5165(DI)\u8bbe\u8ba1\u6a21\u5f0f\u8be6\u89e3\uff1a\u5b9e\u6218\u6559\u7a0b\u4e0e\u4ee3\u7801\u793a\u4f8b"},"content":{"rendered":"

\u8fd9\u662f\u6587\u7ae0\u300aJava\u4f9d\u8d56\u6ce8\u5165 – DI\u8bbe\u8ba1\u6a21\u5f0f\u793a\u4f8b\u6559\u7a0b\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n

\u5185\u5bb9\u7247\u6bb5: Java\u7684\u4f9d\u8d56\u6ce8\u5165\u8bbe\u8ba1\u6a21\u5f0f\u5141\u8bb8\u6211\u4eec\u6d88\u9664\u786c\u7f16\u7801\u7684\u4f9d\u8d56\uff0c\u5e76\u4f7f\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u5b9e\u73b0\u677e\u8026\u5408\u3001\u53ef\u6269\u5c55\u548c\u6613\u7ef4\u62a4\u3002\u6211\u4eec\u53ef\u4ee5\u5728Java\u4e2d\u5b9e\u73b0\u4f9d\u8d56\u6ce8\u5165\uff0c\u5c06\u4f9d\u8d56\u89e3\u6790\u4ece\u7f16\u8bd1\u65f6\u79fb\u5230\u8fd0\u884c\u65f6\u3002<\/p>\n

Java\u4f9d\u8d56\u6ce8\u5165<\/h2>\n

Java\u7684\u4f9d\u8d56\u6ce8\u5165\u5728\u7406\u8bba\u4e0a\u4f3c\u4e4e\u5f88\u96be\u7406\u89e3\uff0c\u6240\u4ee5\u6211\u4f1a\u4e3e\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u7136\u540e\u6211\u4eec\u5c06\u770b\u5230\u5982\u4f55\u4f7f\u7528\u4f9d\u8d56\u6ce8\u5165\u6a21\u5f0f\u6765\u5b9e\u73b0\u5e94\u7528\u7a0b\u5e8f\u7684\u677e\u8026\u5408\u548c\u53ef\u6269\u5c55\u6027\u3002\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\uff0c\u6211\u4eec\u4f7f\u7528EmailService\u6765\u53d1\u9001\u7535\u5b50\u90ae\u4ef6\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u4f1a\u50cf\u4e0b\u9762\u8fd9\u6837\u5b9e\u73b0\u3002<\/p>\n

package com.Olivia.java.legacy;\r\n\r\npublic class EmailService {\r\n\r\n\tpublic void sendEmail(String message, String receiver){\r\n\t\t\/\/ \u53d1\u9001\u90ae\u4ef6\u7684\u903b\u8f91\r\n\t\tSystem.out.println(\"\u90ae\u4ef6\u5df2\u53d1\u9001\u81f3 \"+receiver+ \"\uff0c\u5185\u5bb9\u4e3a=\"+message);\r\n\t}\r\n}\r\n<\/code><\/pre>\n
EmailService\u7c7b\u6301\u6709\u5c06\u7535\u5b50\u90ae\u4ef6\u6d88\u606f\u53d1\u9001\u5230\u63a5\u6536\u65b9\u7535\u5b50\u90ae\u4ef6\u5730\u5740\u7684\u903b\u8f91\u3002\u6211\u4eec\u7684\u5e94\u7528\u4ee3\u7801\u5c06\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
package com.Olivia.java.legacy;\r\n\r\npublic class MyApplication {\r\n\r\n\tprivate EmailService email = new EmailService();\r\n\t\r\n\tpublic void processMessages(String msg, String rec){\r\n\t\t\/\/ \u6267\u884c\u4e00\u4e9b\u6d88\u606f\u9a8c\u8bc1\u3001\u64cd\u4f5c\u903b\u8f91\u7b49\r\n\t\tthis.email.sendEmail(msg, rec);\r\n\t}\r\n}\r\n<\/code><\/pre>\n
\u6211\u4eec\u7684\u5ba2\u6237\u4ee3\u7801\u5c06\u4f7f\u7528MyApplication\u7c7b\u53d1\u9001\u7535\u5b50\u90ae\u4ef6\u6d88\u606f\uff0c\u4ee3\u7801\u5982\u4e0b\u3002<\/p>\n
package com.Olivia.java.legacy;\r\n\r\npublic class MyLegacyTest {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tMyApplication app = new MyApplication();\r\n\t\tapp.processMessages(\"Hi Pankaj\", \"scdev@abc.com\");\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
\u4e4d\u4e00\u770b\uff0c\u4e0a\u8ff0\u5b9e\u73b0\u4f3c\u4e4e\u6ca1\u6709\u95ee\u9898\u3002\u4f46\u662f\uff0c\u4e0a\u8ff0\u4ee3\u7801\u903b\u8f91\u5b58\u5728\u4e00\u5b9a\u7684\u9650\u5236\u3002<\/p>\n
    \n
  • MyApplication\u7c7b\u8d1f\u8d23\u521d\u59cb\u5316\u90ae\u4ef6\u670d\u52a1\u7136\u540e\u4f7f\u7528\u5b83\u3002\u8fd9\u5bfc\u81f4\u4e86\u786c\u7f16\u7801\u4f9d\u8d56\u3002\u5982\u679c\u6211\u4eec\u5c06\u6765\u60f3\u8981\u5207\u6362\u5230\u5176\u4ed6\u66f4\u9ad8\u7ea7\u7684\u90ae\u4ef6\u670d\u52a1\uff0c\u5c06\u9700\u8981\u5728MyApplication\u7c7b\u4e2d\u8fdb\u884c\u4ee3\u7801\u66f4\u6539\u3002\u8fd9\u4f7f\u5f97\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u96be\u4ee5\u6269\u5c55\uff0c\u5982\u679c\u90ae\u4ef6\u670d\u52a1\u5728\u591a\u4e2a\u7c7b\u4e2d\u4f7f\u7528\uff0c\u90a3\u5c06\u4f1a\u66f4\u52a0\u56f0\u96be\u3002<\/li>\n
  • \u5982\u679c\u6211\u4eec\u60f3\u8981\u6269\u5c55\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u4ee5\u63d0\u4f9b\u989d\u5916\u7684\u6d88\u606f\u529f\u80fd\uff0c\u5982\u77ed\u4fe1\u6216Facebook\u6d88\u606f\uff0c\u90a3\u4e48\u6211\u4eec\u9700\u8981\u4e3a\u6b64\u7f16\u5199\u53e6\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u3002\u8fd9\u5c06\u6d89\u53ca\u5e94\u7528\u7a0b\u5e8f\u7c7b\u548c\u5ba2\u6237\u7aef\u7c7b\u7684\u4ee3\u7801\u66f4\u6539\u3002<\/li>\n
  • \u6d4b\u8bd5\u5e94\u7528\u7a0b\u5e8f\u5c06\u975e\u5e38\u56f0\u96be\uff0c\u56e0\u4e3a\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u76f4\u63a5\u521b\u5efa\u90ae\u4ef6\u670d\u52a1\u5b9e\u4f8b\u3002\u6211\u4eec\u65e0\u6cd5\u5728\u6d4b\u8bd5\u7c7b\u4e2d\u6a21\u62df\u8fd9\u4e9b\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n
    \u53ef\u4ee5\u8bf4\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5728MyApplication\u7c7b\u4e2d\u6dfb\u52a0\u4e00\u4e2a\u8981\u6c42\u7535\u5b50\u90ae\u4ef6\u670d\u52a1\u4f5c\u4e3a\u53c2\u6570\u7684\u6784\u9020\u51fd\u6570\uff0c\u6765\u53d6\u6d88\u7535\u5b50\u90ae\u4ef6\u670d\u52a1\u5b9e\u4f8b\u7684\u521b\u5efa\u3002<\/p>\n
    package com.Olivia.java.legacy;\r\n\r\npublic class MyApplication {\r\n\r\n\tprivate EmailService email = null;\r\n\t\r\n\tpublic MyApplication(EmailService svc){\r\n\t\tthis.email=svc;\r\n\t}\r\n\t\r\n\tpublic void processMessages(String msg, String rec){\r\n\t\t\/\/ \u6267\u884c\u4e00\u4e9b\u6d88\u606f\u9a8c\u8bc1\u3001\u64cd\u4f5c\u903b\u8f91\u7b49\r\n\t\tthis.email.sendEmail(msg, rec);\r\n\t}\r\n}\r\n<\/code><\/pre>\n
    \u4f46\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u8981\u6c42\u5ba2\u6237\u7aef\u5e94\u7528\u7a0b\u5e8f\u6216\u6d4b\u8bd5\u7c7b\u521d\u59cb\u5316\u7535\u5b50\u90ae\u4ef6\u670d\u52a1\uff0c\u8fd9\u5e76\u4e0d\u662f\u4e00\u4e2a\u597d\u7684\u8bbe\u8ba1\u51b3\u7b56\u3002\u73b0\u5728\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u5e94\u7528Java\u4f9d\u8d56\u6ce8\u5165\u6a21\u5f0f\u6765\u89e3\u51b3\u4e0a\u8ff0\u5b9e\u73b0\u4e2d\u7684\u6240\u6709\u95ee\u9898\u3002Java\u7684\u4f9d\u8d56\u6ce8\u5165\u81f3\u5c11\u9700\u8981\u4ee5\u4e0b\u5185\u5bb9\uff1a<\/p>\n
      \n
    1. \u670d\u52a1\u7ec4\u4ef6\u5e94\u8be5\u8bbe\u8ba1\u4e3a\u57fa\u7c7b\u6216\u63a5\u53e3\u3002\u6700\u597d\u9009\u62e9\u63a5\u53e3\u6216\u62bd\u8c61\u7c7b\u6765\u5b9a\u4e49\u670d\u52a1\u7684\u5951\u7ea6\u3002<\/li>\n
    2. \u6d88\u8d39\u8005\u7c7b\u5e94\u8be5\u6309\u7167\u670d\u52a1\u63a5\u53e3\u7f16\u5199\u3002<\/li>\n
    3. \u6ce8\u5165\u5668\u7c7b\u8d1f\u8d23\u521d\u59cb\u5316\u670d\u52a1\uff0c\u7136\u540e\u518d\u521d\u59cb\u5316\u6d88\u8d39\u8005\u7c7b\u3002<\/li>\n<\/ol>\n
      Java \u4f9d\u8d56\u6ce8\u5165 – \u670d\u52a1\u7ec4\u4ef6<\/h3>\n
      \u5bf9\u4e8e\u6211\u4eec\u7684\u60c5\u51b5\uff0c\u6211\u4eec\u53ef\u4ee5\u6709\u4e00\u4e2a MessageService \u7528\u6765\u58f0\u660e\u670d\u52a1\u7684\u5b9e\u73b0\u5408\u7ea6\u3002<\/p>\n
      package com.Olivia.java.dependencyinjection.service;\r\n\r\npublic interface MessageService {\r\n\r\n\tvoid sendMessage(String msg, String rec);\r\n}\r\n<\/code><\/pre>\n
      \u73b0\u5728\u5047\u8bbe\u6211\u4eec\u6709\u5b9e\u73b0\u4e0a\u8ff0\u63a5\u53e3\u7684\u7535\u5b50\u90ae\u4ef6\u548c\u77ed\u4fe1\u670d\u52a1\u3002<\/p>\n
      package com.Olivia.java.dependencyinjection.service;\r\n\r\npublic class EmailServiceImpl implements MessageService {\r\n\r\n\t@Override\r\n\tpublic void sendMessage(String msg, String rec) {\r\n\t\t\/\/ \u53d1\u9001\u90ae\u4ef6\u7684\u903b\u8f91\r\n\t\tSystem.out.println(\"\u90ae\u4ef6\u5df2\u53d1\u9001\u81f3 \"+rec+ \"\uff0c\u5185\u5bb9\u4e3a=\"+msg);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
      package com.Olivia.java.dependencyinjection.service;\r\n\r\npublic class SMSServiceImpl implements MessageService {\r\n\r\n\t@Override\r\n\tpublic void sendMessage(String msg, String rec) {\r\n\t\t\/\/ \u53d1\u9001\u77ed\u4fe1\u7684\u903b\u8f91\r\n\t\tSystem.out.println(\"\u77ed\u4fe1\u5df2\u53d1\u9001\u81f3 \"+rec+ \"\uff0c\u5185\u5bb9\u4e3a=\"+msg);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
      \u6211\u4eec\u7684\u4f9d\u8d56\u6ce8\u5165Java\u670d\u52a1\u5df2\u7ecf\u51c6\u5907\u5c31\u7eea\uff0c\u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u6211\u4eec\u7684\u6d88\u8d39\u8005\u7c7b\u3002<\/p>\n
      Java\u4f9d\u8d56\u6ce8\u5165 – \u670d\u52a1\u6d88\u8d39\u8005<\/h3>\n
      \u6211\u4eec\u4e0d\u9700\u8981\u6d88\u8d39\u8005\u7c7b\u7684\u57fa\u63a5\u53e3\uff0c\u4f46\u662f\u6211\u4f1a\u6709\u4e00\u4e2a\u58f0\u660e\u6d88\u8d39\u8005\u7c7b\u5408\u540c\u7684\u6d88\u8d39\u8005\u63a5\u53e3\u3002<\/p>\n
      package com.Olivia.java.dependencyinjection.consumer;\r\n\r\npublic interface Consumer {\r\n\r\n\tvoid processMessages(String msg, String rec);\r\n}\r\n<\/code><\/pre>\n
      \u6211\u7684\u6d88\u8d39\u8005\u7c7b\u5b9e\u73b0\u5982\u4e0b\u3002<\/p>\n
      package com.Olivia.java.dependencyinjection.consumer;\r\n\r\nimport com.Olivia.java.dependencyinjection.service.MessageService;\r\n\r\npublic class MyDIApplication implements Consumer{\r\n\r\n\tprivate MessageService service;\r\n\t\r\n\tpublic MyDIApplication(MessageService svc){\r\n\t\tthis.service=svc;\r\n\t}\r\n\t\r\n\t@Override\r\n\tpublic void processMessages(String msg, String rec){\r\n\t\t\/\/ \u6267\u884c\u4e00\u4e9b\u6d88\u606f\u9a8c\u8bc1\u3001\u64cd\u4f5c\u903b\u8f91\u7b49\r\n\t\tthis.service.sendMessage(msg, rec);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
      \u8bf7\u6ce8\u610f\uff0c\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u7c7b\u4ec5\u4ec5\u4f7f\u7528\u670d\u52a1\uff0c\u800c\u4e0d\u662f\u521d\u59cb\u5316\u670d\u52a1\uff0c\u8fd9\u6837\u53ef\u4ee5\u66f4\u597d\u5730\u5b9e\u73b0”\u5173\u6ce8\u70b9\u5206\u79bb”\u3002\u540c\u65f6\uff0c\u4f7f\u7528\u670d\u52a1\u63a5\u53e3\u4f7f\u6211\u4eec\u80fd\u591f\u901a\u8fc7\u6a21\u62df\u6d88\u606f\u670d\u52a1\u6765\u8f7b\u677e\u6d4b\u8bd5\u5e94\u7528\u7a0b\u5e8f\uff0c\u5e76\u5728\u8fd0\u884c\u65f6\u800c\u4e0d\u662f\u7f16\u8bd1\u65f6\u7ed1\u5b9a\u670d\u52a1\u3002\u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u5199Java\u4f9d\u8d56\u6ce8\u5165\u5668\u7c7b\uff0c\u8fd9\u4e9b\u7c7b\u4f1a\u521d\u59cb\u5316\u670d\u52a1\u548c\u6d88\u8d39\u7c7b\u3002<\/p>\n
      Java \u4f9d\u8d56\u6ce8\u5165 – \u6ce8\u5165\u5668\u7c7b<\/h3>\n
      \u8fd9\u662f\u6587\u7ae0\u300aJava\u4f9d\u8d56\u6ce8\u5165 – DI\u8bbe\u8ba1\u6a21\u5f0f\u793a\u4f8b\u6559\u7a0b\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002<\/p>\n
      \u8ba9\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aMessageServiceInjector\u7684\u63a5\u53e3\uff0c\u8be5\u63a5\u53e3\u5305\u542b\u4e00\u4e2a\u8fd4\u56deConsumer\u7c7b\u7684\u65b9\u6cd5\u58f0\u660e\u3002<\/p>\n
      package com.Olivia.java.dependencyinjection.injector;\r\n\r\nimport com.Olivia.java.dependencyinjection.consumer.Consumer;\r\n\r\npublic interface MessageServiceInjector {\r\n\r\n\tpublic Consumer getConsumer();\r\n}\r\n<\/code><\/pre>\n
      \u73b0\u5728\uff0c\u9488\u5bf9\u6bcf\u9879\u670d\u52a1\uff0c\u6211\u4eec\u9700\u8981\u521b\u5efa\u76f8\u5e94\u7684\u6ce8\u5165\u5668\u7c7b\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
      package com.Olivia.java.dependencyinjection.injector;\r\n\r\nimport com.Olivia.java.dependencyinjection.consumer.Consumer;\r\nimport com.Olivia.java.dependencyinjection.consumer.MyDIApplication;\r\nimport com.Olivia.java.dependencyinjection.service.EmailServiceImpl;\r\n\r\npublic class EmailServiceInjector implements MessageServiceInjector {\r\n\r\n\t@Override\r\n\tpublic Consumer getConsumer() {\r\n\t\treturn new MyDIApplication(new EmailServiceImpl());\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
      package com.Olivia.java.dependencyinjection.injector;\r\n\r\nimport com.Olivia.java.dependencyinjection.consumer.Consumer;\r\nimport com.Olivia.java.dependencyinjection.consumer.MyDIApplication;\r\nimport com.Olivia.java.dependencyinjection.service.SMSServiceImpl;\r\n\r\npublic class SMSServiceInjector implements MessageServiceInjector {\r\n\r\n\t@Override\r\n\tpublic Consumer getConsumer() {\r\n\t\treturn new MyDIApplication(new SMSServiceImpl());\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
      \u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u7a0b\u5e8f\u793a\u4f8b\uff0c\u4e86\u89e3\u5ba2\u6237\u7aef\u5e94\u7528\u7a0b\u5e8f\u5982\u4f55\u4f7f\u7528\u8fd9\u4e2a\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n
      package com.Olivia.java.dependencyinjection.test;\r\n\r\nimport com.Olivia.java.dependencyinjection.consumer.Consumer;\r\nimport com.Olivia.java.dependencyinjection.injector.EmailServiceInjector;\r\nimport com.Olivia.java.dependencyinjection.injector.MessageServiceInjector;\r\nimport com.Olivia.java.dependencyinjection.injector.SMSServiceInjector;\r\n\r\npublic class MyMessageDITest {\r\n\r\n\tpublic static void main(String[] args) {\r\n\t\tString msg = \"Hi Pankaj\";\r\n\t\tString email = \"scdev@abc.com\";\r\n\t\tString phone = \"4088888888\";\r\n\t\tMessageServiceInjector injector = null;\r\n\t\tConsumer app = null;\r\n\t\t\r\n\t\t\/\/\u53d1\u9001\u7535\u5b50\u90ae\u4ef6\r\n\t\tinjector = new EmailServiceInjector();\r\n\t\tapp = injector.getConsumer();\r\n\t\tapp.processMessages(msg, email);\r\n\t\t\r\n\t\t\/\/\u53d1\u9001\u77ed\u4fe1\r\n\t\tinjector = new SMSServiceInjector();\r\n\t\tapp = injector.getConsumer();\r\n\t\tapp.processMessages(msg, phone);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
      \u6b63\u5982\u60a8\u6240\u89c1\uff0c\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u7c7b\u4ec5\u8d1f\u8d23\u4f7f\u7528\u670d\u52a1\uff0c\u800c\u670d\u52a1\u7c7b\u7684\u521b\u5efa\u5219\u662f\u5728\u6ce8\u5165\u5668\u4e2d\u5b8c\u6210\u7684\u3002\u6b64\u5916\uff0c\u5982\u679c\u6211\u4eec\u5e0c\u671b\u8fdb\u4e00\u6b65\u6269\u5c55\u5e94\u7528\u7a0b\u5e8f\u4ee5\u652f\u6301Facebook\u6d88\u606f\u4f20\u9012\u529f\u80fd\uff0c\u53ea\u9700\u7f16\u5199\u76f8\u5e94\u7684\u670d\u52a1\u7c7b\u548c\u6ce8\u5165\u5668\u7c7b\u5373\u53ef\u3002\u56e0\u6b64\uff0c\u4f9d\u8d56\u6ce8\u5165\u5b9e\u73b0\u89e3\u51b3\u4e86\u786c\u7f16\u7801\u4f9d\u8d56\u7684\u95ee\u9898\uff0c\u4f7f\u5e94\u7528\u7a0b\u5e8f\u53d8\u5f97\u66f4\u52a0\u7075\u6d3b\u548c\u6613\u4e8e\u6269\u5c55\u3002\u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u901a\u8fc7\u6a21\u62df\u6ce8\u5165\u5668\u548c\u670d\u52a1\u7c7b\u6765\u8f7b\u677e\u6d4b\u8bd5\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u7c7b\u3002<\/p>\n
      Java\u4f9d\u8d56\u6ce8\u5165 – \u4f7f\u7528Mock\u6ce8\u5165\u5668\u548c\u670d\u52a1\u7684JUnit\u6d4b\u8bd5\u7528\u4f8b<\/h3>\n
      package com.Olivia.java.dependencyinjection.test;\r\n\r\nimport org.junit.After;\r\nimport org.junit.Before;\r\nimport org.junit.Test;\r\n\r\nimport com.Olivia.java.dependencyinjection.consumer.Consumer;\r\nimport com.Olivia.java.dependencyinjection.consumer.MyDIApplication;\r\nimport com.Olivia.java.dependencyinjection.injector.MessageServiceInjector;\r\nimport com.Olivia.java.dependencyinjection.service.MessageService;\r\n\r\npublic class MyDIApplicationJUnitTest {\r\n\r\n\tprivate MessageServiceInjector injector;\r\n\t@Before\r\n\tpublic void setUp(){\r\n\t\t\/\/mock the injector with anonymous class\r\n\t\tinjector = new MessageServiceInjector() {\r\n\t\t\t\r\n\t\t\t@Override\r\n\t\t\tpublic Consumer getConsumer() {\r\n\t\t\t\t\/\/mock the message service\r\n\t\t\t\treturn new MyDIApplication(new MessageService() {\r\n\t\t\t\t\t\r\n\t\t\t\t\t@Override\r\n\t\t\t\t\tpublic void sendMessage(String msg, String rec) {\r\n\t\t\t\t\t\tSystem.out.println(\"Mock Message Service implementation\");\r\n\t\t\t\t\t\t\r\n\t\t\t\t\t}\r\n\t\t\t\t});\r\n\t\t\t}\r\n\t\t};\r\n\t}\r\n\t\r\n\t@Test\r\n\tpublic void test() {\r\n\t\tConsumer consumer = injector.getConsumer();\r\n\t\tconsumer.processMessages(\"Hi Pankaj\", \"scdev@abc.com\");\r\n\t}\r\n\t\r\n\t@After\r\n\tpublic void tear(){\r\n\t\tinjector = null;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
      \u5982\u60a8\u6240\u89c1\uff0c\u6211\u6b63\u5728\u4f7f\u7528\u533f\u540d\u7c7b\u6765\u6a21\u62df\u6ce8\u5165\u5668\u548c\u670d\u52a1\u7c7b\uff0c\u4ee5\u4fbf\u8f7b\u677e\u6d4b\u8bd5\u6211\u7684\u5e94\u7528\u7a0b\u5e8f\u65b9\u6cd5\u3002\u6211\u6b63\u5728\u4f7f\u7528JUnit 4\u8fdb\u884c\u4e0a\u8ff0\u6d4b\u8bd5\u7c7b\uff0c\u56e0\u6b64\uff0c\u5982\u679c\u60a8\u6b63\u5728\u8fd0\u884c\u4e0a\u8ff0\u6d4b\u8bd5\u7c7b\uff0c\u8bf7\u786e\u4fdd\u8be5\u7c7b\u5728\u9879\u76ee\u7684\u6784\u5efa\u8def\u5f84\u4e2d\u3002\u6211\u4eec\u4f7f\u7528\u6784\u9020\u51fd\u6570\u6765\u5728\u5e94\u7528\u7a0b\u5e8f\u7c7b\u4e2d\u6ce8\u5165\u4f9d\u8d56\u9879\uff0c\u53e6\u4e00\u79cd\u65b9\u5f0f\u662f\u4f7f\u7528setter\u65b9\u6cd5\u5728\u5e94\u7528\u7a0b\u5e8f\u7c7b\u4e2d\u6ce8\u5165\u4f9d\u8d56\u9879\u3002\u5bf9\u4e8esetter\u65b9\u6cd5\u4f9d\u8d56\u6ce8\u5165\uff0c\u6211\u4eec\u7684\u5e94\u7528\u7a0b\u5e8f\u7c7b\u5c06\u88ab\u5b9e\u73b0\u5982\u4e0b\u3002<\/p>\n
      package com.Olivia.java.dependencyinjection.consumer;\r\n\r\nimport com.Olivia.java.dependencyinjection.service.MessageService;\r\n\r\npublic class MyDIApplication implements Consumer{\r\n\r\n\tprivate MessageService service;\r\n\t\r\n\tpublic MyDIApplication(){}\r\n\r\n\t\/\/setter dependency injection\t\r\n\tpublic void setService(MessageService service) {\r\n\t\tthis.service = service;\r\n\t}\r\n\r\n\t@Override\r\n\tpublic void processMessages(String msg, String rec){\r\n\t\t\/\/do some msg validation, manipulation logic etc\r\n\t\tthis.service.sendMessage(msg, rec);\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
      package com.Olivia.java.dependencyinjection.injector;\r\n\r\nimport com.Olivia.java.dependencyinjection.consumer.Consumer;\r\nimport com.Olivia.java.dependencyinjection.consumer.MyDIApplication;\r\nimport com.Olivia.java.dependencyinjection.service.EmailServiceImpl;\r\n\r\npublic class EmailServiceInjector implements MessageServiceInjector {\r\n\r\n\t@Override\r\n\tpublic Consumer getConsumer() {\r\n\t\tMyDIApplication app = new MyDIApplication();\r\n\t\tapp.setService(new EmailServiceImpl());\r\n\t\treturn app;\r\n\t}\r\n\r\n}\r\n<\/code><\/pre>\n
      \u4f9d\u8d56\u6ce8\u5165\u662f\u5b9e\u73b0\u63a7\u5236\u53cd\u8f6c\uff08IoC\uff09\u7684\u4e00\u79cd\u65b9\u5f0f\uff0c\u901a\u8fc7\u5c06\u5bf9\u8c61\u7ed1\u5b9a\u4ece\u7f16\u8bd1\u65f6\u79fb\u52a8\u5230\u8fd0\u884c\u65f6\u6765\u5b9e\u73b0\u3002\u5728Java\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5de5\u5382\u6a21\u5f0f\u3001\u6a21\u677f\u65b9\u6cd5\u8bbe\u8ba1\u6a21\u5f0f\u3001\u7b56\u7565\u6a21\u5f0f\u548c\u670d\u52a1\u5b9a\u4f4d\u5668\u6a21\u5f0f\u6765\u5b9e\u73b0IoC\u3002Spring\u4f9d\u8d56\u6ce8\u5165\u3001Google Guice\u548cJava EE CDI\u6846\u67b6\u901a\u8fc7\u4f7f\u7528Java Reflection API\u548cJava\u6ce8\u89e3\u6765\u7b80\u5316\u4f9d\u8d56\u6ce8\u5165\u7684\u8fc7\u7a0b\u3002\u6211\u4eec\u53ea\u9700\u5728\u914d\u7f6eXML\u6587\u4ef6\u6216\u7c7b\u4e2d\u6ce8\u91ca\u5b57\u6bb5\u3001\u6784\u9020\u51fd\u6570\u6216setter\u65b9\u6cd5\u5373\u53ef\u3002<\/p>\n
      \u5176\u4e2d\u4e00\u4e2a\u6700\u597d\u7684setter\u4f9d\u8d56\u6ce8\u5165\u7684\u4f8b\u5b50\u662fStruts2\u7684Servlet API Aware\u63a5\u53e3\u3002\u4f7f\u7528\u6784\u9020\u51fd\u6570\u57fa\u4e8e\u4f9d\u8d56\u6ce8\u5165\u8fd8\u662f\u57fa\u4e8esetter\u7684\u4f9d\u8d56\u6ce8\u5165\u662f\u4e00\u4e2a\u8bbe\u8ba1\u51b3\u7b56\uff0c\u53d6\u51b3\u4e8e\u60a8\u7684\u9700\u6c42\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u7684\u5e94\u7528\u7a0b\u5e8f\u6ca1\u6709\u670d\u52a1\u7c7b\u6839\u672c\u65e0\u6cd5\u5de5\u4f5c\uff0c\u6211\u4f1a\u66f4\u503e\u5411\u4e8e\u9009\u62e9\u57fa\u4e8e\u6784\u9020\u51fd\u6570\u7684DI\u3002\u5426\u5219\uff0c\u5f53\u786e\u5b9e\u9700\u8981\u65f6\uff0c\u6211\u4f1a\u9009\u62e9\u57fa\u4e8esetter\u65b9\u6cd5\u7684DI\u6765\u4f7f\u7528\u5b83\u3002<\/p>\n
      Java\u4f9d\u8d56\u6ce8\u5165\u7684\u597d\u5904<\/h3>\n
      \u5728Java\u4e2d\u4f7f\u7528\u4f9d\u8d56\u6ce8\u5165\u7684\u4e00\u4e9b\u597d\u5904\u662f\uff1a<\/p>\n
        \n
      • \u5173\u6ce8\u70b9\u5206\u79bb<\/li>\n
      • \u51cf\u5c11\u5e94\u7528\u7a0b\u5e8f\u7c7b\u4e2d\u7684\u6837\u677f\u4ee3\u7801\uff0c\u56e0\u4e3a\u521d\u59cb\u5316\u4f9d\u8d56\u9879\u7684\u6240\u6709\u5de5\u4f5c\u90fd\u7531\u6ce8\u5165\u5668\u7ec4\u4ef6\u5904\u7406<\/li>\n
      • \u53ef\u914d\u7f6e\u7ec4\u4ef6\u4f7f\u5e94\u7528\u7a0b\u5e8f\u6613\u4e8e\u6269\u5c55<\/li>\n
      • \u4f7f\u7528\u6a21\u62df\u5bf9\u8c61\u8fdb\u884c\u5355\u5143\u6d4b\u8bd5\u5f88\u5bb9\u6613<\/li>\n<\/ul>\n
        Java \u4f9d\u8d56\u6ce8\u5165\u7684\u7f3a\u70b9<\/h3>\n
        Java\u7684\u4f9d\u8d56\u6ce8\u5165\u4e5f\u6709\u4e00\u4e9b\u7f3a\u70b9\uff1a<\/p>\n
          \n
        • \u5982\u679c\u8fc7\u5ea6\u4f7f\u7528\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7ef4\u62a4\u95ee\u9898\uff0c\u56e0\u4e3a\u66f4\u6539\u7684\u6548\u679c\u5728\u8fd0\u884c\u65f6\u624d\u80fd\u77e5\u9053\u3002<\/li>\n
        • Java\u4e2d\u7684\u4f9d\u8d56\u6ce8\u5165\u9690\u85cf\u4e86\u670d\u52a1\u7c7b\u7684\u4f9d\u8d56\u5173\u7cfb\uff0c\u53ef\u80fd\u5bfc\u81f4\u672c\u5e94\u5728\u7f16\u8bd1\u65f6\u6355\u83b7\u7684\u8fd0\u884c\u65f6\u9519\u8bef\u3002<\/li>\n<\/ul>\n
          \u4e0b\u8f7d\u4f9d\u8d56\u6ce8\u5165\u9879\u76ee<\/p>\n
          \u5728Java\u4e2d\uff0c\u4f9d\u8d56\u6ce8\u5165\u6a21\u5f0f\u5c31\u662f\u8fd9\u4e9b\u3002\u5f53\u6211\u4eec\u63a7\u5236\u7740\u670d\u52a1\u65f6\uff0c\u4e86\u89e3\u5e76\u4f7f\u7528\u5b83\u662f\u5f88\u597d\u7684\u9009\u62e9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
          \u8fd9\u662f\u6587\u7ae0\u300aJava\u4f9d\u8d56\u6ce8\u5165 – DI\u8bbe\u8ba1\u6a21\u5f0f\u793a\u4f8b\u6559\u7a0b\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51713\u90e8\u5206\uff09\u3002 \u5185\u5bb9\u7247\u6bb5: Jav […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[1622,1621,180,1089,1623],"class_list":{"0":"post-557","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-di","8":"tag-java","10":"tag-spring","11":"tag-ioc"},"yoast_head":"\nJava\u4f9d\u8d56\u6ce8\u5165(DI)\u8bbe\u8ba1\u6a21\u5f0f\u8be6\u89e3\uff1a\u5b9e\u6218\u6559\u7a0b\u4e0e\u4ee3\u7801\u793a\u4f8b - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u6df1\u5165\u89e3\u6790Java\u4f9d\u8d56\u6ce8\u5165(DI)\u8bbe\u8ba1\u6a21\u5f0f\u539f\u7406\u4e0e\u5e94\u7528\uff0c\u901a\u8fc7\u8be6\u7ec6\u7684\u4ee3\u7801\u793a\u4f8b\u548c\u5b9e\u6218\u6559\u7a0b\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u5168\u9762\u638c\u63e1DI\u6280\u672f\u3002\u6587\u7ae0\u6db5\u76d6\u4f9d\u8d56\u6ce8\u5165\u7684\u57fa\u672c\u6982\u5ff5\u3001\u5b9e\u73b0\u65b9\u5f0f\u3001\u6700\u4f73\u5b9e\u8df5\u4ee5\u53ca\u5e38\u89c1\u95ee\u9898\u89e3\u51b3\u65b9\u6848\u3002\" \/>\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.silicloud.com\/zh\/blog\/java\u4f9d\u8d56\u6ce8\u5165-di\u8bbe\u8ba1\u6a21\u5f0f\u793a\u4f8b\u6559\u7a0b\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java\u4f9d\u8d56\u6ce8\u5165(DI)\u8bbe\u8ba1\u6a21\u5f0f\u8be6\u89e3\uff1a\u5b9e\u6218\u6559\u7a0b\u4e0e\u4ee3\u7801\u793a\u4f8b\" \/>\n<meta property=\"og:description\" content=\"\u6df1\u5165\u89e3\u6790Java\u4f9d\u8d56\u6ce8\u5165(DI)\u8bbe\u8ba1\u6a21\u5f0f\u539f\u7406\u4e0e\u5e94\u7528\uff0c\u901a\u8fc7\u8be6\u7ec6\u7684\u4ee3\u7801\u793a\u4f8b\u548c\u5b9e\u6218\u6559\u7a0b\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u5168\u9762\u638c\u63e1DI\u6280\u672f\u3002\u6587\u7ae0\u6db5\u76d6\u4f9d\u8d56\u6ce8\u5165\u7684\u57fa\u672c\u6982\u5ff5\u3001\u5b9e\u73b0\u65b9\u5f0f\u3001\u6700\u4f73\u5b9e\u8df5\u4ee5\u53ca\u5e38\u89c1\u95ee\u9898\u89e3\u51b3\u65b9\u6848\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/java\u4f9d\u8d56\u6ce8\u5165-di\u8bbe\u8ba1\u6a21\u5f0f\u793a\u4f8b\u6559\u7a0b\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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