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。

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(){

System.out.println("查询所有用户【all users list】");
}

public static void main(String[] args) {

ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("application-aop.xml");

UserAction userAction = (UserAction)ctx.getBean("userAction");
userAction.queryUsers();

ctx.destroy();
}
}

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>