{"id":1971,"date":"2021-02-04T15:50:10","date_gmt":"2021-02-04T07:50:10","guid":{"rendered":"https:\/\/www.yusian.com\/blog\/?p=1971"},"modified":"2021-02-06T15:33:36","modified_gmt":"2021-02-06T07:33:36","slug":"spring%e8%a7%a3%e8%80%a6%e7%9a%84%e7%ae%80%e5%8d%95%e6%bc%94%e7%a4%ba","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/java\/2021\/02\/04\/1550101971.html","title":{"rendered":"Spring\u89e3\u8026\u7684\u7b80\u5355\u6f14\u793a"},"content":{"rendered":"

0\u3001\u76f8\u5173\u7c7b<\/h2>\n

\n User\n<\/p><\/blockquote>\n

package com.yusian;\n\npublic class User {\n\n    private String username;\n    private String password;\n\n    public User(String username, String password) {\n        this.username = username;\n        this.password = password;\n    }\n}\n\n<\/code><\/pre>\n
\n  UserDao\n<\/p><\/blockquote>\n
package com.yusian;\n\npublic interface UserDao {\n\n    void register(User user);\n\n    boolean login(String username, String password);\n}\n\n<\/code><\/pre>\n
\n  UserDaoImpl\n<\/p><\/blockquote>\n
package com.yusian;\n\npublic class UserDaoImpl implements UserDao {\n\n    @Override\n    public void register(User user) {\n        System.out.println(\"user \" + user + \" register success!!\");\n    }\n\n    @Override\n    public boolean login(String username, String password) {\n        System.out.println(\"user \" + username + \" login success!!\");\n        return false;\n    }\n}\n\n<\/code><\/pre>\n
\n  UserService\n<\/p><\/blockquote>\n
package com.yusian;\n\npublic interface UserService {\n\n    void register(User user);\n\n    boolean login(String username, String password);\n\n}\n\n<\/code><\/pre>\n
\n  UserServiceImpl\n<\/p><\/blockquote>\n
package com.yusian;\n\npublic class UserServiceImpl implements UserService{\n    private UserDao userDao = new UserDaoImpl();\n    @Override\n    public void register(User user) {\n        userDao.register(user);\n    }\n\n    @Override\n    public boolean login(String username, String password) {\n        return userDao.login(username, password);\n    }\n}\n\n<\/code><\/pre>\n
1\u3001\u6784\u9020\u51fd\u6570\u65b9\u5f0f\u521b\u5efa\u5bf9\u8c61<\/h2>\n
  @Test\n  public void userTest() {\n      UserService userService = new UserServiceImpl();\n      User user = new User(\"sian\", \"123456\");\n      userService.register(user);\n      userService.login(\"sian\", \"12345\");\n  }\n<\/code><\/pre>\n
\u6b64\u65f6\uff0c\u63a5\u53e3UserService\u7684\u5b9e\u73b0\u5bf9\u8c61\u4e0e\u4e1a\u52a1\u662f\u8026\u5408\u7684\uff0c\u56e0\u4e3a\u5982\u679c\u8981\u66f4\u6362\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u662f\u9700\u8981\u5728\u8c03\u7528\u5904\u53bb\u4fee\u6539new\u51fa\u6765\u7684\u7c7b\u540d\uff0c\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u521b\u5efa\u63a5\u53e3\u5b9e\u4f8b\u7684\u8fc7\u7a0b\u8fdb\u884c\u5c01\u88c5\uff0c\u901a\u8fc7\u4e00\u4e2a\u5de5\u5177\u7c7b\u521b\u5efa\u51fa\u6765\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u5c06\u521b\u5efa\u5bf9\u8c61\u7684\u8fc7\u7a0b\u4ece\u4e1a\u52a1\u4ee3\u7801\u4e2d\u91ca\u653e\u51fa\u6765\u3002<\/p>\n
2\u3001\u5de5\u5382\u6a21\u5f0f\u521b\u5efa\u5bf9\u8c61<\/h2>\n
package com.yusian;\npublic class BeanFactory {\n    public static UserService getUserService() {\n        return new UserServiceImpl();\n    }\n}\n<\/code><\/pre>\n
\u867d\u7136\u901a\u8fc7\u6784\u9020\u51fd\u6570\u521b\u5efa\u5b9e\u4f8b\u7684\u8fc7\u7a0b\u4ece\u4e1a\u52a1\u4e2d\u62bd\u79bb\u51fa\u6765\uff0c\u4f46\u53ea\u662f\u8f6c\u79fb\u4e86\u4f4d\u7f6e\u800c\u5df2\uff0c\u5e76\u6ca1\u6709\u4ece\u6839\u672c\u4e0a\u89e3\u51b3\u95ee\u9898\uff0c\u5982\u679c\u9700\u8981\u66f4\u6362\u63a5\u53e3\u5b9e\u73b0\u7c7b\uff0c\u8fd8\u662f\u9700\u8981\u4fee\u6539\u4ee3\u7801\u91cd\u65b0\u7f16\u8bd1\uff0c\u80fd\u4e0d\u80fd\u4e0d\u7f16\u8bd1\u6539\u4e86\u5c31\u751f\u6548\u5462\uff1f\u53ef\u4ee5\u7684\uff01<\/p>\n
3\u3001\u901a\u8fc7\u914d\u7f6e\u6587\u4ef6\u53ca\u53cd\u5c04\u65b9\u5f0f\u521b\u5efa\u5b9e\u73b0<\/h2>\n
3.1\u3001\u53cd\u5c04\u521b\u5efa\u5b9e\u4f8b<\/h3>\n
public static UserService getUserService() {\n    try  {\n        Class cls = Class.forName(\"UserServiceImpl\");\n        return (UserService) cls.newInstance();\n    } catch (ClassNotFoundException e) {\n        e.printStackTrace();\n    } catch (InstantiationException e) {\n        e.printStackTrace();\n    } catch (IllegalAccessException e) {\n        e.printStackTrace();\n    }\n    return null;\n}\n<\/code><\/pre>\n
\u53cd\u5c04\u673a\u5236\u53ef\u4ee5\u52a8\u6001\u521b\u5efa\u5bf9\u8c61\uff0c\u7ed9\u5b9a\u7c7b\u540d\u5c31\u80fd\u5b9e\u73b0\uff0c\u8fd9\u79cd\u65b9\u5f0f\u5960\u5b9a\u4e86\u901a\u8fc7\u914d\u7f6e\u5c31\u80fd\u4fee\u6539\u63a5\u53e3\u5b9e\u4f8b\u7684\u57fa\u7840\u3002\u76ee\u524d\u7c7b\u540d\u8fd8\u662f\u5728\u5199\u5728\u4ee3\u7801\u4e2d\u7684\uff0c\u63a5\u4e0b\u6765\u53ea\u9700\u8981\u5c06\u8fd9\u4e2a\u5b57\u7b26\u4e32\u4ece\u4ee3\u7801\u4e2d\u89e3\u8131\u51fa\u6765\uff0c\u4ece\u914d\u7f6e\u6587\u4ef6\u8bfb\u53d6\u5373\u53ef\u3002<\/p>\n
\n  ApplicationContext.properties\n<\/p><\/blockquote>\n
userService = com.yusian.UserServiceImpl\n<\/code><\/pre>\n
\n  BeanFactory\n<\/p><\/blockquote>\n
package com.yusian;\n\nimport java.io.IOException;\nimport java.io.InputStream;\nimport java.util.Properties;\n\npublic class BeanFactory {\n\n    private static Properties prop = new Properties();\n\n    static {\n        ClassLoader classLoader = BeanFactory.class.getClassLoader();\n        try (InputStream is = classLoader.getResourceAsStream(\"ApplicationContext.properties\")) {\n            prop.load(is);\n        } catch (IOException e) {\n            e.printStackTrace();\n        }\n    }\n\n    public static UserService getUserService() {\n        try  {\n            Class cls = Class.forName(prop.getProperty(\"userService\"));\n            return (UserService) cls.newInstance();\n        } catch (ClassNotFoundException e) {\n            e.printStackTrace();\n        } catch (InstantiationException e) {\n            e.printStackTrace();\n        } catch (IllegalAccessException e) {\n            e.printStackTrace();\n        }\n        return null;\n    }\n}\n<\/code><\/pre>\n
\u641e\u5b9a\uff0c\u6253\u5b8c\u6536\u5de5\uff01\u73b0\u5728\u5982\u679c\u6709UserService\u7684\u5176\u4ed6\u5b9e\u73b0\u7c7b\uff0c\u53ea\u9700\u8981\u5c06ApplicationContext.properties\u4e2d\u7684\u5b57\u7b26\u4e32\u4fee\u6539\u6210\u5bf9\u5e94\u7684\u7c7b\u540d\u5373\u53ef\uff0c\u5c06\u8026\u5408\u4ece\u4ee3\u7801\u4e2d\u89e3\u8131\u51fa\u6765\uff0c\u901a\u8fc7\u914d\u7f6e\u6587\u4ef6\u5b8c\u6210\u5207\u6362\u3002<\/p>\n
3.2\u3001\u5c01\u88c5\u53cd\u5c04\u65b9\u6cd5\u4e3a\u5de5\u5382<\/h3>\n
public static Object getBean(String name) {\n    try  {\n        Class cls = Class.forName(prop.getProperty(name));\n        return cls.newInstance();\n    } catch (Exception e) {\n        e.printStackTrace();\n    }\n    return null;\n}\n<\/code><\/pre>\n
4\u3001Sping\u521b\u5efa\u5bf9\u8c61\u7684\u57fa\u672c\u4f7f\u7528<\/h2>\n
\u56de\u987e\u4ee5\u4e0a\u89e3\u8026\u7684\u6b65\u9aa4\uff0c\u5927\u81f4\u5206\u4e3a\uff1a<\/p>\n
    \n
  1. \u51c6\u5907POJO\u7c7b\u3001\u914d\u7f6e\u6587\u4ef6\uff1b<\/li>\n
  2. \u8bfb\u53d6\u914d\u7f6e\u6587\u4ef6\uff0c\u83b7\u53d6\u9700\u8981\u521b\u5efa\u5bf9\u8c61\u7684\u5168\u9650\u5b9a\u7c7b\u540d\uff1b<\/li>\n
  3. \u901a\u8fc7\u53cd\u5c04\u673a\u5236\u521b\u5efa\u5b9e\u4f8b\u5bf9\u8c61<\/li>\n<\/ol>\n
    Sping\u5176\u5b9e\u4e5f\u4e00\u6837\uff1a<\/p>\n
      \n
    1. \u51c6\u5907POJO\u7c7b\u3001\u914d\u7f6e\u6587\u4ef6(applicationContext.xml)\uff1b<\/p>\n<\/li>\n
    2. \n
      \u8bfb\u53d6\u914d\u7f6e\u6587\u4ef6\uff0c\u83b7\u53d6\u4e0a\u4e0b\u6587\u5bf9\u8c61\uff1b<\/p>\n
      ApplicationContext ctx = new ClassPathXmlApplicationContext(\"applicationContext.xml\");\n<\/code><\/pre>\n<\/li>\n
    3. \u901a\u8fc7\u53cd\u5c04\u673a\u5236\u521b\u5efa\u5b9e\u4f8b\u5bf9\u8c61\n
      Object obj = ctx.getBean(\"object\");\n<\/code><\/pre>\n<\/li>\n<\/ol>\n
      \u6700\u7b80\u5355\u7684Spring\u4f7f\u7528\u53ca\u5176\u539f\u7406\u89e3\u6790\u5c31\u662f\u8fd9\u4e48\u7b80\u5355\uff0c\u91cd\u70b9\u5728\u8fd9\u79cd\u601d\u60f3\uff0c\u7406\u89e3\u4e86\u5c31\u77e5\u9053\u4e3a\u4ec0\u4e48\u4f1a\u662f\u8fd9\u6837\u4e86\uff01<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"
      0\u3001\u76f8\u5173\u7c7b User package com.yusian; public class User { private String username; private String password; public User(String username, String password) { this.username = username; this.password = password; } } UserDao package com.yusian; public interface UserDao { void register(User user); boolean login(String username, String password); } UserDaoImpl package com.yusian; public class UserDaoImpl implements UserDao { @Override public […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[347],"class_list":["post-1971","post","type-post","status-publish","format-standard","hentry","category-java","tag-spring"],"_links":{"self":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1971","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/comments?post=1971"}],"version-history":[{"count":0,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/posts\/1971\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/media?parent=1971"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/categories?post=1971"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yusian.com\/blog\/wp-json\/wp\/v2\/tags?post=1971"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}