java动态代理

java动态代理实现方式:

 

1. 创建接口

package com.test.proxyTest;

/**
 * 对象接口 
 */
public interface Subject {

	public String say(String name, int age);  //定义抽象方法 say
	
	public String listenMe(String name, int age); 
	
}

 

2.创建实现类

package com.test.proxyTest;

public class RealSubject implements Subject {

	public RealSubject() {
		// TODO Auto-generated constructor stub
	}

	public String listenMe(String name, int age) {
		// TODO Auto-generated method stub
		
		return "姓名: "+name+" 年龄:"+age ;
	}

	public String say(String name, int age) {
		// TODO Auto-generated method stub
		return "say:"+name+"---"+age;
	}

}

 

3.创建动态代理类（动态代理的关键，重点）

package com.test.proxyTest;

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

public class MyInvocationHandler implements InvocationHandler {
    /**
     * 动态代理类
     */
	private Object obj;
	//绑定真实操作主题
	public Object bind(Object obj){
		this.obj = obj;
	    //动态生成实现类
		return Proxy.newProxyInstance(obj.getClass().getClassLoader(),
				  obj.getClass().getInterfaces(), this);
	}
	
	//动态调用方法
	public Object invoke(Object proxy, Method method, Object[] args)
			throws Throwable {
		// TODO Auto-generated method stub
		Object temp = method.invoke(this.obj, args);
		return temp;
	}

	
	
}

 

4.动态代理实现

package com.test.proxyTest;

public class DailiProxy {

	/**
	 * 测试类
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		MyInvocationHandler handler = new MyInvocationHandler();   //实例化代理操作类
		Subject sub = (Subject)handler.bind(new RealSubject());    //绑定对象
		String info = sub.say("张三", 31);
		System.out.println(info);
		
	}

}