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>
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