Spring学习2_AOP通过XML配置简单实现

Spring在实际运用中可通过注解或者XML配置来实现AOP功能，这里在上一篇的基础上通过Demo来模拟XML配置实现AOP的过程。

代码结构如下

1、Spring配置如下,在<aop:config>中配置好对应的切点pointCut, 然后在切面aspect中引用对应的切点即可。

<?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">

   <bean id = "dao" class="com.dao.UserDaoImpl"/> 

   <bean id="userService" class="com.service.UserService">
       <property name="dao" ref="dao"></property>
   </bean> 

   <bean id = "logInter" class="com.handler.LogInterceptor"/>
   <aop:config>

       <aop:pointcut expression="execution(* com.service.UserService.*(..))" id="servicePointCut" />
       <aop:aspect id="LogAop" ref="logInter">
           <aop:before method="beforeExcute" pointcut-ref="servicePointCut"/>
       </aop:aspect>

   </aop:config>

</beans>

2、拦截类LogInterceptor

package com.handler;

public class LogInterceptor {
    public void beforeExcute(){
        System.out.println("aspect execute.");
    }

}

3、在UserService中通过Spring注入Dao层，完成接口调用。

测试类如下：

package com.test;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.service.UserService;

public class TestAopAnnotation {
    @Test
    public void testAopAnnotation(){

        ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");

        UserService service = (UserService) context.getBean("userService");
        service.save();
    }
}

测试结果：