Java的动态代理实现

最新推荐文章于 2025-07-20 18:42:29 发布

原创最新推荐文章于 2025-07-20 18:42:29 发布 · 315 阅读

0 ·

CC 4.0 BY-SA版权

java 专栏收录该内容

5 篇文章

订阅专栏

实现InvocationHandler接口，重写invoke()方法

package proxy;

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

public class MyInvocationHandler implements InvocationHandler {
    private Object target;

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

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        System.out.println("---before method----");
        Object result = method.invoke(target, args);
        System.out.println("---after method----");

        return result;
    }

    public Object getProxy() {
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
                target.getClass().getInterfaces(), this);
    }
}

定义接口类，该接口被被代理类和Proxy同时实现

package proxy;

public interface UserService {
    public void add();
}

实现

package proxy;

public class UserServiceImp implements UserService {
    @Override
    public void add() {
        System.out.println("--add---");
    }
}

Test

package proxy;

public class ProxyTest {
    public static void main(String [] args) {
        UserService userService = new UserServiceImp();
        MyInvocationHandler myInvocationHandler = new MyInvocationHandler(userService);
        UserService proxy = (UserService) myInvocationHandler.getProxy();
        proxy.add();
    }
}