Spring_AOP_Xml

1.目录结构

2.User

package com.cloud.spring.model;

/**
 * @author cloud
 * @data 2016年5月13日
 * @version 1.0
 * @description:普通的JavaBean
 */
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;
    }
}

 

3.UserDAO

package com.cloud.spring.dao;

import com.cloud.spring.model.User;

/**
 * @author cloud
 * @data 2016年5月13日
 * @version 1.0
 * @description:定义接口，定义规范，必须实现save方法
 */
public interface UserDAO {
    public void save(User user);
    public void delete(User user);
}

 

4.UserDAOImpl

package com.cloud.spring.dao.imp;

import org.springframework.stereotype.Component;

import com.cloud.spring.dao.UserDAO;
import com.cloud.spring.model.User;

/**
 * 
 * @author cloud
 * @data 2016年5月13日
 * @version 1.0
 * @description:实现接口，重写方法
 */
@Component
public class UserDAOImpl implements UserDAO {

    public void save(User user) {
        System.out.println("user saved!");
    }

    public void delete(User user) {
        System.out.println("user delete!");
    }
}

 

5.UserService

 

package com.cloud.spring.service;

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.cloud.spring.dao.UserDAO;
import com.cloud.spring.model.User;

/**
 * 
 * @author cloud
 * @data 2016年5月13日
 * @version 1.0
 * @description:真正的业务处理
 */
@Component("userService")
public class UserService {
    
    private UserDAO userDAO;

    public void add(User user) {
        userDAO.save(user);
    }
    
    public void delete(User user) {
        userDAO.delete(user);
    }

    public UserDAO getUserDAO() {
        return userDAO;
    }

    @Resource
    public void setUserDAO(UserDAO userDAO) {
        this.userDAO = userDAO;
    }
}

 

6.LogIntercepter

package com.cloud.spring.aop;

public class LogIntercepter {
    public void before(){
        System.out.println("method before");
    }
    
    public void afterReturning(){
        System.out.println("method after returning");
    }
    
    public void around(){
        System.out.println("method around");
    }
}

 

7.TestSpring

package com.cloud.spring.test;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.cloud.spring.model.User;
import com.cloud.spring.service.UserService;

public class TestSpring {
    public static void main(String[] args) {
        try {
            ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
            UserService service = (UserService)ctx.getBean("userService");
            service.add(new User());
            service.delete(new User());
        } catch (BeansException e) {
            e.printStackTrace();
        }
    }
}

 

8.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.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">

    <context:component-scan base-package="com.cloud.spring" />

    <!-- 声明切面类 -->
    <bean id="logIntercepter" class="com.cloud.spring.aop.LogIntercepter"></bean>

    <!-- 配置切入点，设置切入方法 -->
    <!-- 执行dao.impl包及其子包中的方法时，发现表达式 -->
    <!-- 这个表达式有被引用的切面类 -->
    <!-- 于是在执行执行dao.impl包及其子包中的方法之前首先执行这个切面类中的before方法 -->
    <aop:config>
        <aop:pointcut expression="execution(* com.cloud.spring.dao.imp..*.*(..))"
            id="userDaoPointcut" />
        <aop:aspect id="logAspect" ref="logIntercepter">
            <!--可以参考切面语法 -->
            <aop:before method="before" pointcut-ref="userDaoPointcut" />
            
            <!--也可以直接写切面语法表达式  -->
            <aop:around method="around"  pointcut="execution(* com.cloud.spring.dao.imp..*.*(..))" />
            
            <aop:after-returning method="afterReturning" pointcut-ref="userDaoPointcut" />
        </aop:aspect>
    </aop:config>

    <!-- 1.pointcut-ref="userDaoPointcut"指定表达式 -->
    <!-- 2.before method="before" 指定Advise是@Before，@AfterReturning,@Around... -->
    <!-- 3.id="logAspect" ref="logIntercepter"指定需要织入的切面类 -->
    <!-- 4.最终的效果就是com.cloud.spring.dao.imp包及其子包下的所有类的所有方法执行之前 织入com.cloud.spring.test.LogInterceper切面类下的before方法 -->
</beans>