Proxy 示例

见附件，可运行，本人亲写亲测。

package com.test.proxy;

public interface ProxyInterface {

public void realMethod();

}



package com.test.proxy;

public class ProxyImpl implements ProxyInterface {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

}

public void realMethod(){
System.out.println("method in real Impl.");
}



}


package com.test.proxy;

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

public class proxyImplHandler implements InvocationHandler{

public ProxyInterface impl;
proxyImplHandler(ProxyInterface impl){
this.impl=impl;
}

@Override
public Object invoke(Object obj, Method method, Object[] args)
throws Throwable {
// TODO Auto-generated method stub
System.out.println("Before realmethod invoke........");
method.invoke(this.impl, args);
System.out.println("after realmethod invoke........");
return null;
}

}



package com.test.proxy;

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

public class ProxyTest {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
ProxyInterface imp =new ProxyImpl();
InvocationHandler handler = new proxyImplHandler(imp);
ProxyInterface o = (ProxyInterface)Proxy.newProxyInstance(
imp.getClass().getClassLoader(),
imp.getClass().getInterfaces(),
handler);
o.realMethod();

}

}