?

接口

public interface UserService {void addUser();void updateUser(); }

接口的實現類?

public class UserServiceImpl implements UserService {@Overridepublic void addUser() {System.out.println("adduser...");}@Overridepublic void updateUser() {System.out.println("updateUser...");}}

?切面

public class MyAspect {public void before(){System.out.println("事務開啟");}public void after(){System.out.println("事務開啟");} }

工廠類，創建代理類?

import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy;public class BeanFactory {public static UserService createProxyService(){final UserService userService = new UserServiceImpl();final MyAspect myAspect = new MyAspect();UserService userServiceProxy = (UserService)Proxy.newProxyInstance(BeanFactory.class.getClassLoader(),userService.getClass().getInterfaces(), new InvocationHandler() {@Overridepublic Object invoke(Object proxy, Method method, Object[] args)throws Throwable {myAspect.before();Object res = method.invoke(userService, args);myAspect.after();return res;}});return userServiceProxy;}}

測試類?

import org.junit.Test;public class TestProxy {@Testpublic void test(){UserService us = BeanFactory.createProxyService();us.addUser();us.updateUser();} }

?

總結

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