spring aop应用场景

1.事务处理:

2.监控

 package com.albert.spring.proxy;

 import org.aspectj.lang.JoinPoint;
 import org.aspectj.lang.ProceedingJoinPoint;

 public class Interceptor
 {
     public void before()
     {
         System.out.println("前置通知");
     }

     public void afterReturning()
     {
         System.out.println("後置通知");
     }

     public void beforeAdd(JoinPoint jp)
     {
         System.out.println("前置通知，獲取類名：" + jp.getTarget().getClass().getName());
         System.out.println("前置通知，獲取方法名：" + jp.getSignature().getName());
         System.out.print("前置通知，獲取參數：");
         for (Object obj : jp.getArgs())
         {
             System.out.print(obj + "\t");
         }
     }

     public void afterReturningRes(String result)
     {
         System.out.println("後置通知,返回結果:" + result);
     }

     public void after()
     {
         System.out.println("最終通知");
     }

     public void AfterThrowing()
     {
         System.out.println("例外通知");
     }

     public void catchException(Exception e)
     {
         System.out.println("獲取拋出的異常：" + e);
     }

     public Object around(ProceedingJoinPoint pjp)
         throws Throwable
     {
         System.out.println("進入環繞");
         // if(){ // 進行一些判斷，再執行環繞Object result = pjp.proceed();
         // }
         System.out.println("退出環繞");
         return result;
     }
 }

 

 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-2.5.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">
     <aop:aspectj-autoproxy />
     <bean id="userDaoImp" class="com.albert.spring.proxy.aop.UserDaoImp" />
     <bean id="aspectBean" class="com.albert.spring.proxy.aop.Interceptor" />
     <aop:config>

         <aop:aspect id="asp" ref="aspectBean">

             <aop:pointcut id="thecut"
                 expression="execution(* com.albert.spring.proxy.aop.UserDaoImp.*(..))" />
             <aop:after-returning pointcut-ref="thecut"
                 method="afterReturningRes" returning="result" />
             <aop:around pointcut-ref="thecut" method="around" />
             <aop:after-throwing pointcut-ref="thecut" method="catchException"
                 throwing="e" />
             <aop:after pointcut-ref="thecut" method="after" />
             <aop:before pointcut-ref="thecut" method="before" />
             <aop:before pointcut-ref="thecut" method="beforeAdd" />
         aop:aspect>
     aop:config>

 beans>