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;
        }
        
    }

}

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>

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 {

}

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>  

 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