Java实现aop案例

MyPersonService.java代码如下:

package com.shihuan.jdkaop.service;

public interface MyPersonService {
	
	public void findPerson(String name);
	
}

MyPersonServiceImpl.java代码如下:

package com.shihuan.jdkaop.service.impl;

import com.shihuan.jdkaop.service.MyPersonService;

public class MyPersonServiceImpl implements MyPersonService {

	public String myproperty = "shihuan...";
	
	@Override
	public void findPerson(String name) {
		System.out.println("在com.shihuan.jdkaop.service.impl.MyPersonServiceImpl.findPerson()中: " + name);
	}

}

SecurityHandler.java代码如下:

package com.shihuan.jdkaop.handler;

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

import com.shihuan.jdkaop.service.MyPersonService;
import com.shihuan.jdkaop.service.impl.MyPersonServiceImpl;

public class SecurityHandler implements InvocationHandler {

	private Object targetObject;
	
	public Object createProxyInstance(Object targetObject){
		this.targetObject = targetObject;
		
		//创建一个代理对象，此对象是一个与目标对象实现了相同接口的对象，第一个参数为目标对象的类加载器，第二个参数为目标对象所实现的所有接口，第三个参数为实现了InvocationHandler接口的对象实例，这里是SecurityHandler本身
		return Proxy.newProxyInstance(this.targetObject.getClass().getClassLoader(), this.targetObject.getClass().getInterfaces(), this);
	}
	
	/**
	 * InvocationHandler接口的方法
	 * @param proxy 代理对象
	 * @param method 被拦截到的方法
	 * @param args 被拦截到的方法的输入参数
	 * @return 代理对象最后又将拦截到的方法处理委派回给目标对象自己处理
	 */
	@Override
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {

		MyPersonServiceImpl bean = (MyPersonServiceImpl) this.targetObject;
		
		Object result = null;
		
		System.out.println("before advice()");
		result = method.invoke(bean, args);
		System.out.println("after advice()");
		System.out.println("参数个数: " + args.length);
		for (int i = 0; i < args.length; i++) {
			System.out.println("每一个具体的参数值: " + args[i]);
		}
		System.out.println(bean.myproperty);
		
		return result;
	}

}

TestMyAop.java代码如下:

package com.shihuan.jdkaop.test;

import com.shihuan.jdkaop.handler.SecurityHandler;
import com.shihuan.jdkaop.service.MyPersonService;
import com.shihuan.jdkaop.service.impl.MyPersonServiceImpl;

public class TestMyAop {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		SecurityHandler myhandler = new SecurityHandler();
		
		MyPersonService mybz = (MyPersonService) myhandler.createProxyInstance(new MyPersonServiceImpl());
		
		mybz.findPerson("yushibo");
	}

}