Java 动态代理小示例（官方自带，基于接口）

目录

写一个类

package Proxy;

public class Son implements IWork{
    public void work(){
        System.out.println("儿子你在工作");
    }
}

写一个接口，让Son类实现接口

package Proxy;

public interface IWork {
    public void work();
}

写一个代理类，代理Son

package Proxy;

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

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

        IWork son = new Son();

        IWork o = (IWork) Proxy.newProxyInstance(son.getClass().getClassLoader(), son.getClass().getInterfaces(), new InvocationHandler() {
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                System.out.println("父亲我帮你看合同");
                method.invoke(son, args);
                System.out.println("父亲我帮你拿工资");
                return null;
            }
        });
        o.work();
    }
}

效果

没有用代理

package Proxy;

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

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

        IWork son = new Son();

        IWork o = (IWork) Proxy.newProxyInstance(son.getClass().getClassLoader(), son.getClass().getInterfaces(), new InvocationHandler() {
            @Override
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                System.out.println("父亲我帮你看合同");
                method.invoke(son, args);
                System.out.println("父亲我帮你拿工资");
                return null;
            }
        });
//        o.work();

        son.work();
    }
}

效果