创建交通工具接口：Vehicle
package proxy;
public interface Vehicle {
void drive();
}
创建充电接口：Rechargable
package proxy;
public interface Rechargable {
void recharge();
}
创建电动车实现类：ElectricCar
package proxy;
public class ElectricCar implements Rechargable, Vehicle {
@Override
public void drive() {
System.out.println("电动车跑起来了!!!");
}
@Override
public void recharge() {
System.out.println("电动车正在充电!!!");
}
}
创建测试类：Test
package proxy;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
/**
* @ClassName Test
* @Description TODO
* @Date 2019/8/6 9:16
* @Created by sunyiwei
*/
public class Test {
public static void main(String[] args){
ElectricCar car = new ElectricCar();
// 1.获取对应的ClassLoader
ClassLoader classLoader = car.getClass().getClassLoader();
// 2.获取ElectricCar 所实现的所有接口
Class[] interfaces = car.getClass().getInterfaces();
/*
3.根据上面提供的信息，创建代理对象 在这个过程中，
a.JDK会通过根据传入的参数信息动态地在内存中创建和.class 文件等同的字节码
b.然后根据相应的字节码转换成对应的class，
c.然后调用newInstance()创建实例
*/
Object proxy = Proxy.newProxyInstance(classLoader, interfaces, new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
System.out.println("将要调用 " + method.getName() + " 方法!!!");
method.invoke(car);
System.out.println(method.getName() + " 调用完成!!!");
return null;
}
});
Vehicle vehicle = (Vehicle) proxy;
vehicle.drive();
Rechargable rechargable = (Rechargable) proxy;
rechargable.recharge();
}
}
