Spring aop annotation

首先建立xml文档beans.xml

<?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-2.5.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"> (红色部分为aop所必需引入的)  <context:annotation-config />  <context:component-scan base-package="com.chpn"/>   <aop:aspectj-autoproxy />（aop 自动代理） </beans>

建立aop包，建立LogInterceptor.java

package com.chpn.aop; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.springframework.stereotype.Component; @Aspect @Component public class LogInterceptor {  @Before("execution (public * com.chpn.dao.impl.UserDAOImpl.save(com.chpn.model.User))")  public void before(){   System.out.println("Before method");  } }

在各个类上加注解

UserDaoImpl.java

package com.chpn.dao.impl; import org.springframework.stereotype.Component; import com.chpn.dao.UserDAO; import com.chpn.model.User; @Component("u") public class UserDAOImpl implements UserDAO {  @Override  public void save(User u) {   System.out.println("user save");  } }

UserService.java

 

package com.chpn.service; import javax.annotation.Resource; import org.springframework.stereotype.Component; import com.chpn.dao.UserDAO; import com.chpn.model.User; @Component("userService") public class UserService {  public UserDAO userDAO;  public void add(User user) {      userDAO.save(user);  }  public UserDAO getUserDAO() {   return userDAO;  }  @Resource(name="u")  public void setUserDAO(UserDAO userDAO) {   this.userDAO = userDAO;  } }

 Test.class

public class Test {  public static void main(String args[]){   ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");      UserService service = (UserService)ctx.getBean("userService");   System.out.println(service.getClass());   service.add(new User());      ctx.destroy();  } }