package cn.hc.domain;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;

import java.lang.reflect.Proxy;

/**

 * 代理对象创建的工厂类

 * @author hc

 *

 */

public class JDKProxyFactory implements InvocationHandler{

	//被代理对象

	private Object target;

	public JDKProxyFactory(Object target){

		this.target=target;

	}

	//创建代理

	public Object createProxy(){

		//三个参数：类加载器 实现接口 invocationHandler

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

	}

	public Object invoke(Object arg0, Method arg1, Object[] arg2)

			throws Throwable {

		// TODO Auto-generated method stub

		//调用目标真是的方法

		System.out.println("日志已经被记录");

		return arg1.invoke(target, arg2);

	}

}

package cn.hc.domain;

//代理对象的接口

public interface  UserDao {

	public void save();

	public void update();

}package cn.hc.domain;

/**

 * 被代理的目标对象

 * @author hc

 *

 */

public class UserDaoImpl implements UserDao {

	public void save() {

		// TODO Auto-generated method stub

		System.out.println("添加用户");

	}

	public void update() {

		// TODO Auto-generated method stub

		System.out.println("更新用户");

	}

}

//测试类package cn.hc.domain;

import org.junit.Test;

public class TestProxy {

	@Test

	public void testJdkProxy(){

		//测试jdk动态代理

		//1真实目标对象

		UserDao userDao=new UserDaoImpl();

		//System.out.println(userDao);

		UserDao proxy=(UserDao) new JDKProxyFactory(userDao).createProxy();

		proxy.save();

		proxy.update();

	}

}

package cn.hc.cglibProxy;

import java.lang.reflect.Method;

import org.springframework.cglib.proxy.Enhancer;

import org.springframework.cglib.proxy.MethodInterceptor;

import org.springframework.cglib.proxy.MethodProxy;

public class CGlibProxyFactory implements MethodInterceptor{

	private Object target;

	public CGlibProxyFactory(Object target){

		this.target=target;

	}

	//创建代理对象的方法

	public Object createProxy() {

		//创建Enhance对象

		Enhancer enhancer=new Enhancer();

		//cglib创建代理，对目标对象创建子类对象

		enhancer.setSuperclass(target.getClass());

		//传入callback对象，对目标增强

		enhancer.setCallback(this);

		return enhancer.create();

	}

	//arg3 用于执行父类的方法

	public Object intercept(Object arg0, Method arg1, Object[] arg2,

			MethodProxy arg3) throws Throwable {

		// TODO Auto-generated method stub

		System.out.println("开始记录日志");

		return arg1.invoke(target,arg2);

	}

}

package cn.hc.cglibProxy;

public class ProductDao {

	public void add(){

		System.out.println("添加");

	}

	public void delete(){

		System.out.println("删除");

	}

}

//测试方法

package cn.hc.cglibProxy;

import org.junit.Test;

public class CGlibTest {

	@Test

  public void test1(){

	  //创建目标对象

	  ProductDao dao=new ProductDao();

	  ProductDao proxy=(ProductDao) new CGlibProxyFactory(dao).createProxy();

	  proxy.add();

	  proxy.delete();

  }

}