spring AOP @Around @Before @After 区别

此段小代码演示了spring aop中@Around @Before @After三个注解的区别@Before是在所拦截方法执行之前执行一段逻辑。@After 是在所拦截方法执行之后执行一段逻辑。@Around是可以同时在所拦截方法的前后执行一段逻辑。

[Java]代码

package com.itsoft.action;

import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Controller;

/**
*

  • @author zxf

  • 演示aop测试类
    */
    @Controller
    public class UserAction {

    public void queryUsers(){

     </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"查询所有用户【all users list】"</span><span class="pun">);</span><span class="pln">
    

    }

    public static void main(String[] args) {

     </span><span class="typ">ClassPathXmlApplicationContext</span><span class="pln"> ctx </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">ClassPathXmlApplicationContext</span><span class="pun">(</span><span class="str">"application-aop.xml"</span><span class="pun">);</span><span class="pln">
    
     </span><span class="typ">UserAction</span><span class="pln"> userAction </span><span class="pun">=</span><span class="pln"> </span><span class="pun">(</span><span class="typ">UserAction</span><span class="pun">)</span><span class="pln">ctx</span><span class="pun">.</span><span class="pln">getBean</span><span class="pun">(</span><span class="str">"userAction"</span><span class="pun">);</span><span class="pln">
     userAction</span><span class="pun">.</span><span class="pln">queryUsers</span><span class="pun">();</span><span class="pln">
    
     ctx</span><span class="pun">.</span><span class="pln">destroy</span><span class="pun">();</span><span class="pln">
    

    }
    }

[Java]代码

package com.itsoft;

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

/**
*

  • @author Administrator

  • 通过aop拦截后执行具体操作
    */
    @Aspect
    @Component
    public class LogIntercept {

    @Pointcut("execution(public * com.itsoft.action...(..))")
    public void recordLog(){}

    @Before("recordLog()")
    public void before() {
    this.printLog("已经记录下操作日志@Before 方法执行前");
    }

    @Around("recordLog()")
    public void around(ProceedingJoinPoint pjp) throws Throwable{
    this.printLog("已经记录下操作日志@Around 方法执行前");
    pjp
    .proceed();
    this.printLog("已经记录下操作日志@Around 方法执行后");
    }

    @After("recordLog()")
    public void after() {
    this.printLog("已经记录下操作日志@After 方法执行后");
    }

    private void printLog(String str){
    System.out.println(str);
    }
    }

演示@Around @Before @After 区别

<?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:context="http://www.springframework.org/schema/context"
      xsi:schemaLocation="
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd
       http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/aop 
       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
    <context:annotation-config />
    <context:component-scan base-package="com.itsoft"/>
    <aop:aspectj-autoproxy />
</beans>
posted @ 2017-11-28 15:20  星朝  阅读(1201)  评论(0)    收藏  举报