学步园

@Test
	public void proxyTest()
	{
		JDKProxyFactory factory = new JDKProxyFactory();
		PeopleService peopleService = (PeopleService) factory.createProxyInstance(new PeopleServiceBean("张三"));
		peopleService.save("hello");
	}

package com.tiger.aop;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

import com.tiger.service.impl.PeopleServiceBean;

public class JDKProxyFactory implements InvocationHandler
{
	private Object targetObject;

	public Object createProxyInstance(Object targetObject)
	{
		this.targetObject = targetObject;
		return Proxy.newProxyInstance(this.targetObject.getClass().getClassLoader(),
				this.targetObject.getClass().getInterfaces(), this);
	}

	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable
	{
		PeopleServiceBean bean = (PeopleServiceBean) this.targetObject;
		Object result = null;
		
		if(bean.getUser() != null)
		{
			result = method.invoke(targetObject, args);
		}
		
		return result;
	}
}

package com.tiger.service;

public interface PeopleService
{
	public void save(String name);
	
	public void update(String name,Integer peopleid);
	
	public String getPeopleName(Integer peopleid);
}

package com.tiger.service.impl;

import com.tiger.service.PeopleService;

public class PeopleServiceBean implements PeopleService
{
	private String user = null;
	
	public PeopleServiceBean(){}
	
	public PeopleServiceBean(String user)
	{
		this.user = user;
	}
	
	public void save(String name)
	{
		System.out.println("我是save()方法");
	}

	public void update(String name, Integer peopleid)
	{
		System.out.println("我是update()方法");
	}

	public String getPeopleName(Integer peopleid)
	{
		System.out.println("我是getPeopleName()方法");
		return "xxx";
	}

	public String getUser()
	{
		return user;
	}
}

结果：

我是save()方法