Java的动态代理实现

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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();    }}

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