Spring代理方式2

一：UserService.java

package com.cloud.demo6; public interface UserService { void querUsers(); void saveUser(); void deleteUser(); }

二：UserServiceImpl.java

package com.cloud.demo6;

public class UserServiceImpl implements UserService{

@Override

public void querUsers() {

System.out.println("UserServiceImpl.querUsers()");

}

@Override

public void saveUser() {

System.out.println("UserServiceImpl.saveUser()");

}

@Override

public void deleteUser() {

System.out.println("UserServiceImpl.deleteUser()");

}

}

三：LogJdkProxy.java

package com.cloud.demo6;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

public class LogJdkProxy implements InvocationHandler{

private Object target;

public LogJdkProxy(Object target){

this.target=target;

}

/**

* 创建代理对象

* @return

*/

public Object createProxyInstance(){

return Proxy.newProxyInstance(getClass().getClassLoader(), target.getClass().getInterfaces(), this);

}

public Object invoke(Object proxy, Method method, Object[] args)

throws Throwable {

System.out.println("操作前");

//执行原始对象方法

Object result=method.invoke(target, args);

System.out.println("操作后");

return result;

}

}
四：MainTest.java

package com.cloud.demo6;

import org.junit.Test;

public class MainTest {

@Test

public void test1() throws Exception {

UserService userService=new UserServiceImpl();

userService=(UserService) new LogJdkProxy(userService).createProxyInstance();

userService.querUsers();

}

}