Spring AOP（二、注解配置实现）

前一篇博文已经介绍过了通过XML文件配置实现AOP切面编程，这一篇介绍一下注解实现AOP切面编程，相对于Xml文件配置，注解方式就显得十分的简便

这是项目的结构：

首先，使用注解实现AOP要在applicationContext.xml中的beans加入下面配置

xmlns:aop="http://www.springframework.org/schema/aop"
 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd"
<aop:aspectj-autoproxy/>

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns:context="http://www.springframework.org/schema/context"
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.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/>
<context:component-scan base-package="com.pro"/>
<aop:aspectj-autoproxy/>

<bean id="studentsDaoImpl" class="com.pro.vo.StudentsDAOImpl"></bean>

</beans>

下面我们看一下在切面类中是如何使用AOP注解的

StudentsDAOAspectJ.java

package com.pro.proxy;

import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class StudentsDAOAspectJ {

@Pointcut("execution(public void com.pro.vo.StudentsDAOImpl.*Students())")
public void doFilter(){

}

@Before("doFilter()")
public void preMethod(){
System.out.println("--------执行方法之前---------");
}
@After("doFilter()")
public void afterMethod(){
System.out.println("--------执行方法之后---------");
}

}

test.java

package com.pro.test;

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

import com.pro.dao.StudentsDAO;

public class Test {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
StudentsDAO sDao = (StudentsDAO) ctx.getBean("studentsDaoImpl");
sDao.saveStudents();

}

}

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