spring-AOP

spring-AOP

1,实体类

public class User {private String username;private String password;public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}

2，数据库操作Dao类

public interface UserDao {public void save(User u);}

3，数据库实现类

@Componentpublic class UserDaoImpl implements UserDao{@Overridepublic void save(User u) {System.out.println("a user save !");}}

4，业务service类

@Servicepublic class UserService {private UserDao userDao;public UserDao getUserDao() {return userDao;}@Resource   //默认是按名称userDaopublic void setUserDao(UserDao userDao) {this.userDao = userDao;}public void Add(User u){this.userDao.save(u);}}

5，代理处理类

@Aspectpublic class LogInterceptor {public void before(){System.out.println("method start!");}public void end(){System.out.println("method end!");}}

6，xml配置

<?xml version="1.0" encoding="UTF-8"?><beans  xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans        http://www.springframework.org/schema/beans/spring-beans.xsd        http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-2.5.xsd        http://www.springframework.org/schema/aop        http://www.springframework.org/schema/aop/spring-aop-2.5.xsd" ><context:annotation-config />  <!--默认初始化4个处理annotation的bean，若扫描到写的有@Autowired 将会调用set方法注入    是根据byType注入的   若有两个类型u的话，可以使用@Qualifier("u")  --><context:component-scan base-package="com.cn.sxt" /><!-- 开启自动扫描，之后就不用bean注，会自动根据类名首字母小写作为bena的名字 --><bean id="logInteceptor" class="com.cn.sxt.aop.LogInterceptor"></bean><aop:config><aop:pointcut expression="execution(public * com.cn.sxt.service..*.*(..))" id="servicePointcut"/><aop:aspect id="logAspect" ref="logInteceptor"><aop:before method="before" pointcut-ref="servicePointcut"/><aop:after method="end" pointcut-ref="servicePointcut"/></aop:aspect></aop:config></beans>

7，测试类

@Testpublic void testAdd() throws JDOMException, IOException, InstantiationException, IllegalAccessException, ClassNotFoundException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException {ApplicationContext acx = new ClassPathXmlApplicationContext("beans.xml");UserService userService = (UserService) acx.getBean("userService");User u = new User();userService.Add(u);} 

8，结果输出：

method start!a user save !method end!