c/c++语言开发共享详细了解MVC+proxy

目录

• 1、创建业务层userservice接口定义需要完成的功能
• 2、创建持久层userdao接口定义具体的curd
• 3、完成userservice接口和userdao的实现类
• 4、创建invocationhandler接口的实现类
• 5、创建表示层servlet去完成调用

  /**   * 创建目标接口，定义目标接口要完成的功能   */  public interface userservice {      boolean save(user user);  }  

  /**   * 创建目标接口，定义目标接口要完成的功能   */  public interface userservice {      boolean save(user user);  }  

  public class userserviceimpl implements userservice {      private userdao dao=new userdaoimpl();      @override      public boolean save(user user) {          boolean success=false;          success=dao.insert(user);          return success;      }  }  

  public class userdaoimpl implements userdao {      @override      public boolean insert(user user) {          system.out.println("insert into t_user (username,password)values('"+user.getusername()+"','"+user.getpassword()+"')");          return true;      }  }  

  public class userhandler implements invocationhandler {        //动态创建目标对象      object target=null;      public userhandler(object target){          this.target=target;      }      @override      public object invoke(object proxy, method method, object[] args) throws throwable {          //返回值          object result=null;          //增强功能          system.out.println("begin transaction.....");          result=result=method.invoke(target,args);          system.out.println("commit transaction.....");          system.out.println("rollback transaction.....");          system.out.println("end transaction.....");          //返回值          return result;      }  }  

  public class usersaveservlet {      public static void main(string[] args) throws exception {          //需要调用的目标类          class c= userserviceimpl.class;          object obj = c.newinstance();          //获取该类的类加载器          classloader loader = obj.getclass().getclassloader();          //目标对象实现的接口          class<?>[] interfaces=obj.getclass().getinterfaces();          //获取invocationhandler对象          invocationhandler handler=new userhandler(obj);          //创建代理对象          //将返回值转为接口类型          userservice service=(userservice)proxy.newproxyinstance(loader,interfaces,handler);          boolean success=service.save(new user("张三","123456"));          system.out.println(success?"保存成功":"保存失败");      }  }