JDKProxy动态代理实现AOP

 

 

 

 

package cn.yourcompany.service;

public interface PersonService {
	public String getPersonName(Integer personid);
	public void save(String name);
	public void update(String name, Integer personid);
}

 

package cn.yourcompany.service.impl;

import cn.yourcompany.service.PersonService;

public class PersonServiceBean implements PersonService {
	private String user = null;

	public PersonServiceBean(String user) {
		this.user = user;
	}
	public PersonServiceBean() {
	}

	public String getPersonName(Integer personid) {
		if (user != null) {
			System.out.println("我是getPersonName()方法");
		}
		return "xxx";
	}

	public void save(String name) {
		if (user != null) {
			System.out.println("我是save()方法");
		}
	}

	public void update(String name, Integer personid) {
		if (user != null) {
			System.out.println("我是update()方法");
		}
	}

	public String getUser() {
		return user;
	}
}

 
 

package cn.yourcompany.aop;

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

import cn.yourcompany.service.impl.PersonServiceBean;

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 {
		PersonServiceBean bean = (PersonServiceBean) targetObject;
		Object result=null;
		if (bean.getUser() != null) {
			result = method.invoke(targetObject, args);
		}
		return result;
	}
}

 

 

 

 

 

package junit.test;

import org.junit.Test;

import cn.yourcompany.aop.JDKProxyFactory;
import cn.yourcompany.service.PersonService;
import cn.yourcompany.service.impl.PersonServiceBean;

public class JDKProxyTest {
	@Test
	public void testJDKProxy()
	{
		JDKProxyFactory factory=new JDKProxyFactory();
		PersonService service = (PersonService)factory.createProxyInstance(new PersonServiceBean("sss"));
		service.save("sss");
	}
}