使用JDK中的Proxy技术实现AOP功能[动态代理]

package cn.itcase.service;

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

package cn.itcase.service.impl;

import cn.itcase.service.PersonService;

public class PersonSerciceBean implements PersonService {
private String user = null;//业务需求，如果有权限（及user不为空）则容许执行方法。

public PersonSerciceBean() {
}

public PersonSerciceBean(String name) {
this.user = name;
}

public String getPersonName(Integer personId) {
// TODO Auto-generated method stub
return "xxx";
}

public void save(String name) {
// TODO Auto-generated method stub
System.out.println("我是save()方法");

}

public void update(String name, Integer perooid) {
// TODO Auto-generated method stub
System.out.println("我是update()方法");
}

public String getUser() {
return user;
}

}

package cn.itcase.aop;

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

import cn.itcase.service.impl.PersonSerciceBean;

public class JDKPROxyFactory implements InvocationHandler {
private Object targetObject;

public Object createProxyIntance(Object targetObject) {
this.targetObject = targetObject;

//第1个参数：类转载器，2个参数：代理对象要实现的接口，3个参数：回调【改类实现上面那个接口】，当拦截到方法时，则执行方法
return Proxy.newProxyInstance(this.targetObject.getClass()
.getClassLoader(),
this.targetObject.getClass().getInterfaces(), this);
}

public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
// TODO Auto-generated method stub
PersonSerciceBean bean = (PersonSerciceBean) this.targetObject;

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

}

package cn.itcase;

import org.junit.BeforeClass;
import org.junit.Test;
import cn.itcase.aop.JDKPROxyFactory;
import cn.itcase.service.PersonService;
import cn.itcase.service.impl.PersonSerciceBean;

public class AOPTest {

@BeforeClass
public static void setUpBeforeClass() throws Exception {
}
@Test public void proxyTest(){
JDKPROxyFactory factory=new JDKPROxyFactory();
PersonService service =  (PersonService)factory.createProxyIntance(new PersonSerciceBean());
//    (PersonService)factory.createProxyIntance(new PersonSerciceBean("xxx"));
service.save("");
}
}