Spring之AOP编程

注意添加:
com.springsource.org.aopalliance-1.0.0.jar
com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar
两个jar包

方法调用拦截实现

package com.studio.advice;



import org.aopalliance.intercept.MethodInterceptor;

import org.aopalliance.intercept.MethodInvocation;

import org.springframework.stereotype.Component;



@Component

public class MyAdvice implements MethodInterceptor {



    @Override

    public Object invoke(MethodInvocation invocation) throws Throwable {

        

        try{

            

            System.out.println("interceptor-Befor:");

            Object object= invocation.proceed();

            System.out.println("interceptor-End:");

            return object;

        }catch(Exception ex){

            

            System.out.println("interceptor-ex:" + ex.getMessage());

            throw ex;

        }

        

    }



}

View Code

 

beens.xml配置文件:

<?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:aop="http://www.springframework.org/schema/aop"

    xmlns:tx="http://www.springframework.org/schema/tx"

    xmlns:context="http://www.springframework.org/schema/context"

    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.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-2.0.xsd

            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd">

            

     <context:component-scan base-package="com.studio.*"/>

       

       

         

     <aop:config>

        <aop:pointcut id="mypointcut" expression="execution(* com..service..*(..))"/>

        <aop:advisor

            advice-ref="myAdvice"

            pointcut-ref="mypointcut"

            order="1" />

        <aop:advisor

            advice-ref="myAdvice2"

            pointcut="execution(* com..service..*(..))"

            order="2" />

    </aop:config>  

     

</beans>

View Code

说明
pointcut的execution中“*”表示一个单词(字母组成中间没空格)而“..”表示0或任意多个

定义注解:

package com.studio;



import java.lang.annotation.Documented;

import java.lang.annotation.ElementType;

import java.lang.annotation.Retention;

import java.lang.annotation.RetentionPolicy;

import java.lang.annotation.Target;



@Target({ElementType.METHOD, ElementType.TYPE})

@Retention(RetentionPolicy.RUNTIME)

@Documented

public @interface CheckLogin {



}

View Code

注解切入点表达式

     <aop:config>

        <aop:pointcut id="mypointcut" expression="execution(* com..service..*(..))"/>

        <aop:advisor

            advice-ref="myAdvice"

            pointcut-ref="mypointcut"

            order="1" />

        <aop:advisor

            advice-ref="myAdvice2"

            pointcut="@annotation(com.studio.CheckLogin) 

                      or @target(com.studio.CheckLogin)"

            order="2" />

    </aop:config>  

View Code

 说明:
 允许在列或方法上放置CheckUser 以实现拦截
代码在参考华为网盘"软件测试与任务/spring"

参考:
http://blog.csdn.net/topwqp/article/details/8696897
http://blog.sina.com.cn/s/blog_5198c7370100hw1p.html
http://liusg123.iteye.com/blog/941546
http://lavasoft.blog.51cto.com/62575/172292/ 切入点表达式