Java深入浅出讲解代理模式

static Object newProxyInstance(ClassLoader loader, Class[] interfaces,InvocationHandler h):

public interface Moveable {
    void move();
}

//实现Moveable 接口，并随机暂停一段时间

import java.util.Random;
public class Car implements Moveable{
    @Override
    public void move() {
        try{
            Thread.sleep(new Random().nextInt(1000));
            System.out.println("汽车行驶中");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

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

public class TimeHandler implements InvocationHandler{

    public TimeHandler(Object target){
        super();
        this.target = target;
    }
    private Object target;


    
    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        long startTime = System.currentTimeMillis();
        System.out.println("汽车开始行使");

        method.invoke(target);

        long endTime = System.currentTimeMillis();
        System.out.println("汽车行驶结束，行驶的时间为："+(endTime-startTime)+"毫秒");
        return null;
    }
}

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

public class Test {
    public static void main(String[] args) {

        Car car = new Car();
        InvocationHandler h = new TimeHandler(car);
        Class<?> cls = car.getClass();

        
        Moveable m = (Moveable) Proxy.newProxyInstance(cls.getClassLoader(),
                cls.getInterfaces(),h);
        m.move();
    }
}