Spring Mvc那点事---(27)Spring Mvc基于aspect的AOP实现

   spring中通过使用aspect注解，不需要在配置文件中进行配置，就可以实现切面编程.

   需要引用如下JAR包

  

<dependencies>     <!-- spring 组件配置 -->  <dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.2.5.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-aop --><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-aop</artifactId>    <version>4.2.5.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver --><dependency>    <groupId>org.aspectj</groupId>    <artifactId>aspectjweaver</artifactId>    <version>1.8.9</version></dependency>    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>3.8.1</version>      <scope>test</scope>    </dependency>  </dependencies>

   创建业务类

  

package com.springdemo.aopdeom;import org.aspectj.lang.annotation.Before;import org.springframework.stereotype.Component;@Componentpublic class Ticket {public void SaleTicket(){System.out.println("售票");}}

创建切面

package com.springdemo.aopdeom;import java.util.Date;import org.aspectj.lang.JoinPoint;import org.aspectj.lang.ProceedingJoinPoint;import org.aspectj.lang.annotation.AfterReturning;import org.aspectj.lang.annotation.AfterThrowing;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.core.annotation.Order;import org.springframework.stereotype.Component;@Component@Order(1)@Aspectpublic class TicketAspect {@Pointcut("execution(* com.springdemo.aopdeom.*.*(..))")public void TicketMethod(){} @Before(value = "execution(* com.springdemo.aopdeom.*.*(..))")    public void doBefore(JoinPoint jp) {        System.out.println("执行前准备,方法名称"+jp.getSignature().getName()+",时间:"+new Date());                    }     @AfterReturning(value = "TicketMethod()")    public void doAfter(JoinPoint jp) {        System.out.println("执行后,时间:"+new Date());    }        @Around(value = "execution(* com.springdemo.aopdeom.*.*(..))")    public void doAround(ProceedingJoinPoint pjp) throws Throwable {        System.out.println("执行前环绕\n");        Object result = pjp.proceed();        System.out.println("执行后环绕\n");    }        @AfterThrowing(value = "execution(* com.springdemo.aopdeom.*.*(..))", throwing = "e")    public void doThrow(JoinPoint jp, Throwable e) {        System.out.println("出现异常");    }}

配置文件aop.xml

<?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:p="http://www.springframework.org/schema/p"    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-3.0.xsd               http://www.springframework.org/schema/context               http://www.springframework.org/schema/context/spring-context-3.0.xsd           http://www.springframework.org/schema/aop               http://www.springframework.org/schema/aop/spring-aop-3.0.xsd"    default-autowire="byName">    <context:component-scan base-package="com.springdemo.aopdeom" />    <!-- 打开aop 注解 -->    <aop:aspectj-autoproxy /></beans>

package com.springdemo.aopdeom;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;/** * Hello world! * */public class App {    public static void main( String[] args )    {     ApplicationContext context = new ClassPathXmlApplicationContext("classpath:com/springdemo/aopdeom/aop.xml");     Ticket t = (Ticket)context.getBean("ticket");     t.SaleTicket();    }}

1.前置通知/环绕通知(proceed方法执行之前)--执行顺序不确定
2.被通知方法
3.后置通知/环绕通知(proceed方法执行之后)--执行顺序不确定