{"id":12612,"date":"2023-09-06T16:06:53","date_gmt":"2023-09-06T08:06:53","guid":{"rendered":"https:\/\/92it.top\/?p=12612"},"modified":"2023-09-06T16:06:53","modified_gmt":"2023-09-06T08:06:53","slug":"spring%e5%ae%b9%e5%99%a8-%e6%b3%a8%e5%85%a5%e7%ae%a1%e7%90%86%e5%af%b9%e8%b1%a1%e6%9c%89%e4%bb%80%e4%b9%88%e5%a5%bd%e5%a4%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=12612","title":{"rendered":"Spring\u5bb9\u5668 \u6ce8\u5165\u7ba1\u7406\u5bf9\u8c61\u6709\u4ec0\u4e48\u597d\u5904\uff1f"},"content":{"rendered":"\n<p><strong>1.\u524d\u8a00<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u5728Spring\u6846\u67b6\u4e2d\uff0c\u5c06\u4e00\u4e2a\u7c7b\u901a\u8fc7\u6ce8\u89e3\u7684\u65b9\u5f0f\u6ce8\u5165\u5230Spring\u5bb9\u5668\u4e2d\uff0c\u4e00\u822c\u6307\u5728\u7c7b\u4e0a\u4f7f\u7528@Component\u6216\u5176\u884d\u751f\u6ce8\u89e3\uff08\u5982@Service\u3001@Repository\u7b49\uff09\uff0c\u7528\u4e8e\u544a\u8bc9Spring\u5bb9\u5668\u5c06\u8be5\u7c7b\u5b9e\u4f8b\u5316\u5e76\u7ba1\u7406\u5b83\u7684\u751f\u547d\u5468\u671f\u3002<\/p>\n\n\n\n<p>\u901a\u8fc7\u6ce8\u5165\uff0c\u53ef\u4ee5\u5b9e\u73b0Spring\u6846\u67b6\u7684IOC\uff08\u63a7\u5236\u53cd\u8f6c\uff09\u548cDI\uff08\u4f9d\u8d56\u6ce8\u5165\uff09\u529f\u80fd\uff0c\u5373\u5c06\u5bf9\u8c61\u7684\u521b\u5efa\u3001\u7ba1\u7406\u548c\u4f7f\u7528\u5206\u79bb\u5f00\u6765\uff0c\u901a\u8fc7Spring\u5bb9\u5668\u81ea\u52a8\u7ba1\u7406\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\uff0c\u964d\u4f4e\u4e86\u7cfb\u7edf\u7684\u8026\u5408\u5ea6\uff0c\u63d0\u9ad8\u4e86\u7cfb\u7edf\u7684\u53ef\u6269\u5c55\u6027\u3001\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u6d4b\u8bd5\u6027\u3002\u53e6\u5916\uff0c\u6ce8\u5165\u8fd8\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3001\u4f18\u96c5\uff0c\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u4e0d\u6ce8\u5165\u5728Spring\u5bb9\u5668\u4e2d\uff0c\u5176\u5b9e\u4f8b\u5316\u548c\u7ba1\u7406\u9700\u8981\u6211\u4eec\u624b\u52a8\u5b8c\u6210\uff0c\u5373\u9700\u8981\u901a\u8fc7new\u5173\u952e\u5b57\u624b\u52a8\u521b\u5efa\u5bf9\u8c61\uff0c\u5e76\u4e14\u9700\u8981\u7ba1\u7406\u8be5\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\uff0c\u6bd4\u5982\u624b\u52a8\u9500\u6bc1\u8be5\u5bf9\u8c61\u7b49\u3002\u8fd9\u6837\u4f1a\u5bfc\u81f4\u4ee3\u7801\u5197\u4f59\u5ea6\u9ad8\u3001\u7ef4\u62a4\u6210\u672c\u9ad8\uff0c\u4e14\u4e0d\u5229\u4e8e\u6a2a\u5411\u6269\u5c55\u548c\u5355\u5143\u6d4b\u8bd5\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u5c06\u4e00\u4e2a\u7c7b\u901a\u8fc7\u6ce8\u89e3\u7684\u65b9\u5f0f\u6ce8\u5165\u5230spring\u5bb9\u5668\u4e2d\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u5b9e\u8df5\uff0c\u5b83\u80fd\u591f\u5e2e\u52a9\u6211\u4eec\u7b80\u5316\u4ee3\u7801\uff0c\u63d0\u9ad8\u7cfb\u7edf\u7684\u53ef\u7ef4\u62a4\u6027\u3001\u6269\u5c55\u6027\u548c\u53ef\u6d4b\u8bd5\u6027\u3002<\/p>\n\n\n\n<p>\u5f53\u6211\u4eec\u5c06\u4e00\u4e2a\u7c7b\u901a\u8fc7\u6ce8\u89e3\u7684\u65b9\u5f0f\u6ce8\u5165\u5230Spring\u5bb9\u5668\u4e2d\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7Autowired\u7b49\u6ce8\u5165\u5f62\u5f0f\u6765\u83b7\u53d6\u8be5\u5bf9\u8c61\u7684\u5b9e\u4f8b\uff0c\u5e76\u76f4\u63a5\u4f7f\u7528\u8be5\u5b9e\u4f8b\uff0c\u65e0\u9700\u624b\u52a8\u521b\u5efa\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Component\npublic class UserService {\n \n    @Autowired\n    private UserDao userDao;\n \n    public User getUserById(Long id) {\n        return userDao.getUserById(id);\n    }\n}\n \n@Repository\npublic class UserDaoImpl implements UserDao {\n \n    @Override\n    public User getUserById(Long id) {\n        \/\/ ...\u67e5\u8be2\u6570\u636e\u5e93\u5e76\u8fd4\u56de\u7528\u6237\u4fe1\u606f\n    }\n}<\/pre>\n\n\n\n<p>\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cUserService\u548cUserDaoImpl\u90fd\u88ab\u6ce8\u89e3\u4e3aSpring Bean\uff0c\u5728UserService\u4e2d\u901a\u8fc7@Autowired\u6ce8\u89e3\u6ce8\u5165\u4e86UserDao\u7c7b\u578b\u7684\u5b9e\u4f8b\uff0c\u800cUserDaoImpl\u5b9e\u73b0\u4e86UserDao\u63a5\u53e3\uff0c\u540c\u65f6\u4e5f\u88ab\u6ce8\u89e3\u4e3aSpring Bean\u3002\u8fd9\u6837\u4e00\u6765\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u5176\u4ed6\u5730\u65b9\u76f4\u63a5\u4f7f\u7528UserService\uff0c\u800c\u4e0d\u7528\u5173\u5fc3UserDaoImpl\u7684\u5b9e\u4f8b\u5316\u548c\u7ba1\u7406\uff0cSpring\u5bb9\u5668\u4f1a\u81ea\u52a8\u4e3a\u6211\u4eec\u7ba1\u7406\u8be5\u5bf9\u8c61\u7684\u521b\u5efa\u548c\u751f\u547d\u5468\u671f\u3002<\/p>\n\n\n\n<p>\u5047\u8bbe\u6211\u4eec\u5e0c\u671b\u5c06UserDaoImpl\u66ff\u6362\u4e3a\u53e6\u4e00\u4e2a\u5b9e\u73b0\u65b9\u5f0f\uff0c\u53ea\u9700\u8981\u5b9e\u73b0UserDao\u63a5\u53e3\u5e76\u6ce8\u89e3\u4e3aSpring Bean\u5373\u53ef\uff0c\u5bf9\u4e8eUserService\u53ca\u5176\u4ed6\u8c03\u7528UserDao\u7684\u4ee3\u7801\u6765\u8bf4\uff0c\u90fd\u65e0\u9700\u4fee\u6539\u3002\u8fd9\u6837\u5e26\u6765\u7684\u597d\u5904\u5c31\u662f\u53ef\u4ee5\u8f7b\u677e\u5730\u8fdb\u884c\u7ec4\u4ef6\u66ff\u6362\uff0c\u964d\u4f4e\u4e86\u8026\u5408\u5ea6\uff0c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u6269\u5c55\u6027\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u662f\u53e6\u4e00\u4e2a\u5173\u4e8e@Component\u6ce8\u89e3\u7684\u4f8b\u5b50\uff0c\u5047\u8bbe\u6211\u4eec\u9700\u8981\u5b9a\u4e49\u4e00\u4e2aJDBC\u8fde\u63a5\u6c60\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u5b9a\u4e49\u4e3aSpring\u7ec4\u4ef6\uff0c\u5e76\u5728\u5176\u4ed6\u5730\u65b9\u4f7f\u7528\u5b83\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Component\npublic class ConnectionPool {\n    \n    private String url;\n    private String username;\n    private String password;\n \n    public ConnectionPool(@Value(\"${jdbc.url}\") String url, \n                          @Value(\"${jdbc.username}\") String username, \n                          @Value(\"${jdbc.password}\") String password) {\n        this.url = url;\n        this.username = username;\n        this.password = password;\n    }\n \n    public Connection getConnection() {\n        \/\/...\u83b7\u53d6\u8fde\u63a5\n    }\n}<\/pre>\n\n\n\n<p>\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528@Component\u6ce8\u89e3\u5c06ConnectionPool\u7c7b\u6807\u8bb0\u4e3aSpring\u7ec4\u4ef6\uff0c\u5e76\u4f7f\u7528@Value\u6ce8\u89e3\u5c06\u8fde\u63a5\u6570\u636e\u5e93\u7684url\u3001username\u3001password\u4eceSpring\u5bb9\u5668\u4e2d\u6ce8\u5165\u5230ConnectionPool\u6784\u9020\u51fd\u6570\u4e2d\uff0c\u4ece\u800c\u5728ConnectionPool\u5b9e\u4f8b\u5316\u65f6\u81ea\u52a8\u83b7\u53d6\u8fd9\u4e9b\u914d\u7f6e\u4fe1\u606f\uff0c\u5b9e\u73b0\u4e86\u4f9d\u8d56\u6ce8\u5165\u7684\u7279\u6027\u3002<\/p>\n\n\n\n<p>\u53e6\u5916\uff0c\u901a\u8fc7\u5c06ConnectionPool\u7ec4\u4ef6\u6ce8\u5165\u5230\u5176\u4ed6\u7ec4\u4ef6\u4e2d\uff0c\u6211\u4eec\u80fd\u591f\u8f7b\u677e\u5730\u5bf9\u6570\u636e\u5e93\u76f8\u5173\u7684\u64cd\u4f5c\u8fdb\u884c\u7ba1\u7406\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@Service\npublic class UserService {\n \n    @Autowired\n    private UserDao userDao;\n \n    @Autowired\n    private ConnectionPool connectionPool;\n \n    \/\/...\u5176\u4ed6\u65b9\u6cd5\n}<\/pre>\n\n\n\n<p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528@Autowired\u6ce8\u89e3\u5c06ConnectionPool\u7ec4\u4ef6\u6ce8\u5165\u5230UserService\u7ec4\u4ef6\u4e2d\uff0c\u5e76\u5728\u9700\u8981\u8fde\u63a5\u6570\u636e\u5e93\u65f6\u4f7f\u7528\u5b83\u3002\u8fd9\u6837\u901a\u8fc7\u6ce8\u5165\u7684\u65b9\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u907f\u514d\u5728Service\u7ec4\u4ef6\u4e2d\u624b\u52a8\u521b\u5efaConnectionPool\u5bf9\u8c61\u6216\u786c\u7f16\u7801\u6570\u636e\u5e93\u8fde\u63a5\u4fe1\u606f\uff0c\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7075\u6d3b\u6027\u3002<\/p>\n\n\n\n<p><strong>2.\u90a3\u4e48\u5f88\u591a\u4eba\u5c31\u6709\u7591\u95ee\u4e86\uff0c\u90a3\u8fd9\u6837\u548c\u81ea\u5b9a\u4e49\u5de5\u5177\u7c7b\u4e0d\u662f\u4e00\u6837\u7684\u610f\u601d\u5417\uff0c\u53ea\u662f\u5c11\u4e86\u8282\u7701\u4e86\u521b\u5efa\u5bf9\u8c61\u65f6new\u7684\u8fc7\u7a0b\uff1f<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u5176\u5b9e\u4e0d\u5b8c\u5168\u4e00\u6837\u3002\u867d\u7136\u6ce8\u5165\u65b9\u5f0f\u548c\u81ea\u5b9a\u4e49\u5de5\u5177\u7c7b\u90fd\u53ef\u4ee5\u907f\u514d\u624b\u52a8\u521b\u5efa\u5bf9\u8c61\u3001\u91cd\u590d\u6784\u9020\u7b49\u95ee\u9898\uff0c\u4f46\u662f\u5b83\u4eec\u7684\u5b9e\u73b0\u65b9\u5f0f\u548c\u610f\u56fe\u4e0d\u540c\u3002<\/p>\n\n\n\n<p>\u81ea\u5b9a\u4e49\u5de5\u5177\u7c7b\u901a\u5e38\u662f\u4e3a\u4e86\u63d0\u4f9b\u4e00\u4e9b\u9759\u6001\u65b9\u6cd5\uff0c\u5b83\u4eec\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u7c7b\u6216\u7c7b\u7684\u5b9e\u4f8b\uff0c\u5e76\u4e14\u65e0\u72b6\u6001\uff0c\u4e00\u822c\u662f\u76f4\u63a5\u4f7f\u7528static\u5173\u952e\u5b57\u4fee\u9970\u65b9\u6cd5\uff0c\u4f8b\u5982\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class StringUtils {\n    \n    public static boolean isEmpty(String str) {\n        return str == null || str.trim().length() == 0;\n    }\n \n    public static String capitalize(String str) {\n        if (str == null || str.length() == 0) {\n            return str;\n        }\n        return Character.toUpperCase(str.charAt(0)) + str.substring(1);\n    }\n}<\/pre>\n\n\n\n<p>\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cStringUtils\u5e76\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u7c7b\u6216\u7c7b\u7684\u5b9e\u4f8b\uff0c\u5b83\u63d0\u4f9b\u9759\u6001\u65b9\u6cd5isEmpty\u548ccapitalize\uff0c\u7528\u4e8e\u5b57\u7b26\u4e32\u7684\u5e38\u89c1\u64cd\u4f5c\u3002\u6211\u4eec\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528StringUtils\u7c7b\u7684\u9759\u6001\u65b9\u6cd5\uff0c\u800c\u4e0d\u7528\u901a\u8fc7new\u5173\u952e\u5b57\u624b\u52a8\u521b\u5efa\u8be5\u7c7b\u7684\u5b9e\u4f8b\u3002<\/p>\n\n\n\n<p>\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u901a\u8fc7\u6ce8\u5165\u7684\u65b9\u5f0f\u53ef\u4ee5\u66f4\u597d\u5730\u5b9e\u73b0\u7ec4\u4ef6\u7684\u7ba1\u7406\u548c\u4f9d\u8d56\u6ce8\u5165\u3002\u867d\u7136\u5728\u6784\u9020\u51fd\u6570\u4e2d\u4f7f\u7528@Autowired\u6ce8\u89e3\u6ce8\u5165Bean\u5bf9\u8c61\u6709\u4e9b\u7c7b\u4f3c\u4e8e\u7b80\u5355\u7684\u5de5\u5382\u6a21\u5f0f\uff0c\u4f46\u6709\u533a\u522b\u3002\u5de5\u5382\u6a21\u5f0f\u662f\u5728\u9700\u8981\u5bf9\u8c61\u7684\u65f6\u5019\u5728\u5de5\u5382\u4e2d\u751f\u4ea7\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5e76\u76f4\u63a5\u8fd4\u56de\u5b83\uff0c\u800cSpring\u5bb9\u5668\u4f1a\u7ba1\u7406\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f\uff0c\u6bcf\u6b21\u5728\u9700\u8981\u5bf9\u8c61\u65f6\u8fd4\u56de\u5176\u5df2\u7ecf\u7ba1\u7406\u7684\u540c\u4e00\u4e2a\u5b9e\u4f8b\u3002\u6b64\u5916\uff0cSpring\u5bb9\u5668\u8fd8\u63d0\u4f9b\u4e86\u5f88\u591a\u4fbf\u6377\u7684\u529f\u80fd\uff0c\u4f8b\u5982\u63d0\u4f9b\u7ed9\u6846\u67b6\u4f7f\u7528\u7684AOP\u4ee5\u53ca\u7528\u4e8e\u5904\u7406\u4e8b\u52a1\u548c\u5b89\u5168\u6027\u7b49\u7684\u6a21\u5757\uff0c\u4ece\u800c\u7b80\u5316\u6211\u4eec\u7684\u4e1a\u52a1\u903b\u8f91\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u867d\u7136\u81ea\u5b9a\u4e49\u5de5\u5177\u7c7b\u548c\u901a\u8fc7\u6ce8\u5165\u65b9\u5f0f\u5b9e\u73b0\u529f\u80fd\u6709\u4e00\u4e9b\u76f8\u4f3c\u4e4b\u5904\uff0c\u4f46\u5b9e\u73b0\u65b9\u5f0f\u548c\u4f7f\u7528\u573a\u666f\u7565\u6709\u4e0d\u540c\uff0c\u9700\u8981\u8003\u8651\u5177\u4f53\u60c5\u51b5\u6765\u9009\u62e9\u6700\u5408\u9002\u7684\u65b9\u5f0f\u3002<\/p>\n\n\n\n<p><strong>3.\u90a3\u4e48\u54ea\u4e9b\u573a\u666f\u7528\u5de5\u5177\u7c7b\uff0c\u54ea\u4e9b\u573a\u666f\u9002\u5408\u7528\u5bf9\u8c61\u6ce8\u5165\u5462\uff1f<\/strong><\/p>\n\n\n\n<hr 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