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">

}

}

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);
}
}

<?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>