InvocationHandler接口与Proxy类

（动态代理简而言之，就是对于一个对象，在调用其方法时，能够附加的做些其他操作而产生的。）

package com.ygl.dynamicproxy;
 


 import java.lang.reflect.InvocationHandler;

 import java.lang.reflect.Method;

 import java.lang.reflect.Proxy;

 import java.util.List;

 import java.util.Vector;



 public class VectorProxy  implements  InvocationHandler{

private Object proxyobj;


public VectorProxy(Object obj){

this.proxyobj=obj;

}

//往里面传对象，对象实现什么接口，返回的代理就实现什么接口

public static Object factory(Object obj){

Class<?> clazz=obj.getClass();

return Proxy.newProxyInstance(clazz.getClassLoader(), clazz.getInterfaces(),new VectorProxy(obj));

}



@Override

public Object invoke(Object proxy, Method method, Object[] args)

throws Throwable {


System.out.println("before Calling"+method);

if(null!=args){

for(Object obj:args){

System.out.println(obj);

}

}


Object object=method.invoke(proxyobj, args);

System.out.println("after Calling"+method);

return object;

}

public static void main(String[] args) {

List v=(List) factory(new Vector());


v.add("New");


v.add("HH");

System.out.println(v);

}

}
//*******************************
before Callingpublic abstract boolean java.util.List.add(java.lang.Object)
 New
 after Callingpublic abstract boolean java.util.List.add(java.lang.Object)
 before Callingpublic abstract boolean java.util.List.add(java.lang.Object)
 HH
 after Callingpublic abstract boolean java.util.List.add(java.lang.Object)
 before Callingpublic java.lang.String java.lang.Object.toString()
 after Callingpublic java.lang.String java.lang.Object.toString()
 [New, HH]