动态代理模式的使用

package 设计模式;

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

//主题接口
interface  Isubject
{
    public void f1();
    public void f2();
}
class Subject implements Isubject
{

    @Override
    public void f1() {
        // TODO Auto-generated method stub
        System.out.println("调用方法1");
        
    }

    @Override
    public void f2() {
        // TODO Auto-generated method stub
        System.out.println("调用方法2");
        
    }
}
//静态代理类的实现
class  StaticProxy implements Isubject
{
    //被代理的对象
    private Isubject real=null;
    public StaticProxy(Isubject real)
    {
        this.real =real;
    }

    @Override
    public void f1() {
        System.out.println("调用前处理");
        real.f1();
        System.out.println("调用后处理");
        
    }

    @Override
    public void f2() {
        // TODO Auto-generated method stub
        System.out.println("调用前处理");
        real.f2();
        System.out.println("调用后处理");
        
    }
    

}
class Handler implements InvocationHandler

{
    private Isubject real=null; //一个实际主题
    public  Handler(Isubject real)
    {
        this.real=real;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args)
            throws Throwable {
        System.out.println("before"+method.getName());
        method.invoke(real, args);
        System.out.println("after"+method.getName());
        return null;
        
    }
}

public class 动态代理2 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        //静态代理类的测试
        Subject sub=new Subject();
        //StaticProxy sp=new StaticProxy(sub);
        //sp.f1();
        ClassLoader loader=sub.getClass().getClassLoader();//获得具体类的加载器
        Class[] interfaces=sub.getClass().getInterfaces();
        Handler h=new Handler(sub);
        Proxy proxy=(Proxy) Proxy.newProxyInstance(loader, interfaces, h);
        ((Isubject) proxy).f1();
        ((Isubject) proxy).f2();
        
        
        
        
        
        
        

    }

}