动态代理Demo

package reflect;

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

public class ProxyDemo {
	public static void main(String[] args) {
		LoginProxy lp = new LoginProxy();
		Login login =(Login)lp.proxy(new LoginImpl());
		login.login();
		
	}
}
interface Login{
	public void login();
}
class LoginImpl implements Login{
	public void login(){
		System.out.println("login.......");
	}
}
class LoginProxy implements InvocationHandler{

	private Object obj;
	public Object proxy(Object obj){
		this.obj = obj;
		return Proxy.newProxyInstance(obj.getClass().getClassLoader(), obj.getClass().getInterfaces(), this);
	}
	@Override
	public Object invoke(Object arg0, Method arg1, Object[] arg2)
			throws Throwable {
		doBefore();
		Object result = arg1.invoke(obj, arg2);
		doAfter();
		return result;
	}
	 private void doBefore() {  
	        System.out.println("before....");  
	    }    
	private void doAfter() {  
	        System.out.println("after....");  
	    }  
}