1,AOP名词解释

 

 2,AOP演示

(1)导包:

(2)准备目标对象

package com.songyan.service;

import org.aspectj.lang.ProceedingJoinPoint;

import sun.net.www.content.text.plain;

/**
 * 通知类
 * @author sy
 *
 */
public class MyAdvice {
    //前置通知-->目标方法调用前调用
    //后置通知(如果发生异常不在调用)-->目标方法调用后调用
    //环绕通知-->目标方法调用前和后调用
    //异常拦截通知-->出现异常调用
    //后置通知(不论是否发生异常都会调用)-->目标方法调用后调用
/*-----------------------前置--------------------------*/
    public void before()
    {
        System.out.println("before~~~~~~");
    }
    
    /*-----------------------后置(如果发生异常不在调用)--------------------------*/
    public void after()
    {
        System.out.println("after(如果发生异常不在调用)~~~~~~");
    }
    
    /*-----------------------环绕--------------------------*/
    public Object around(ProceedingJoinPoint joinPoint) throws Throwable
    {
        System.out.println("around(上)~~~~~~");
        //调用目标代码
        Object proceed=joinPoint.proceed();
        System.out.println("around(下)~~~~~~");
        return proceed;
    }
    
    /*-----------------------异常拦截--------------------------*/
    public void afterException()
    {
        System.out.println("afterException~~~~~~");
    }
    
    
    /*-----------------------后置(不论是否发生异常都会调用)--------------------------*/
    public void after_final()
    {
        System.out.println("after(不论是否发生异常都会调用)~~~~~~");
    }
    
    
}

 

(3)准备通知(事物管理的代码)

  S1:导入AOP命名空间

<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.springframework.org/schema/beans" 
   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-4.2.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context-4.2.xsd
  http://www.springframework.org/schema/aop
  http://www.springframework.org/schema/aop/spring-aop-4.2.xsd "
> </beans>

S2:配置目标对象

    <!--配置目标对象 -->
    <bean name="userservice" class="com.songyan.service.UsrServiceImpl"></bean>

S3:配置通知对象

    <!--配置通知对象 -->
    <bean name="myadvice" class="com.songyan.service.MyAdvice"></bean>

S4:将通知织入目标对象

    <!--将通知对象织入目标对象 -->
    <aop:config>
        <!--设置切入点 -->
        <!--public void com.songyan.service.UsrServiceImpl.save() 
       void com.songyan.service.UsrServiceImpl.save() * com.songyan.service.UsrServiceImpl.save()
       * com.songyan.service.UsrServiceImpl.*() * com.songyan.service.*ServiceImpl.*()
       * com.songyan.service.*ServiceImpl.*(..) * com.songyan.service..*ServiceImpl.*(..)
--> <aop:pointcut expression="* com.songyan.service..*ServiceImpl.*(..)" id="pc" />

(4)配置进行织入(通知织入目标对象)

        <!--给通知 设置切面 -->
        <aop:aspect ref="myadvice">
            <aop:before method="before" pointcut-ref="pc" />
            <aop:after-returning method="after" pointcut-ref="pc" />
            <aop:around method="around" pointcut-ref="pc" />
            <aop:after-throwing method="afterException" pointcut-ref="pc" />
            <aop:after method="after_final" pointcut-ref="pc" />
        </aop:aspect>
    </aop:config>
</beans>

 

完整配置信息

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://www.springframework.org/schema/beans" 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-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd ">
    <!--配置目标对象 -->
    <bean name="userservice" class="com.songyan.service.UsrServiceImpl"></bean>
    <!--配置通知对象 -->
    <bean name="myadvice" class="com.songyan.service.MyAdvice"></bean>
    <!--将通知对象织入目标对象 -->
    <aop:config>
        <!--设置切入点 -->
        <!--public void com.songyan.service.UsrServiceImpl.save() void com.songyan.service.UsrServiceImpl.save() 
            * com.songyan.service.UsrServiceImpl.save() * com.songyan.service.UsrServiceImpl.*() 
            * com.songyan.service.*ServiceImpl.*() * com.songyan.service.*ServiceImpl.*(..) 
            * com.songyan.service..*ServiceImpl.*(..) -->
        <aop:pointcut expression="execution(* com.songyan.service.*ServiceImpl.*(..))" id="pc" />
        <!--给通知 设置切面 -->
        <aop:aspect ref="myadvice">
            <aop:before method="before" pointcut-ref="pc" />
            <aop:after-returning method="after" pointcut-ref="pc" />
            <aop:around method="around" pointcut-ref="pc" />
            <aop:after-throwing method="afterException" pointcut-ref="pc" />
            <aop:after method="after_final" pointcut-ref="pc" />
        </aop:aspect>
    </aop:config>
</beans>

(4)测试

package com.songyan.service;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Demo {
public static void main(String[] args) {
    ApplicationContext applicationContext=new ClassPathXmlApplicationContext("com/songyan/service/beans1.xml");
    UserService userService=(UserService)applicationContext.getBean("userservice");
    userService.delete();
}
}

 将delete里面的代码修改:

    public void before()
    {
        System.out.println("before~~~~~~");
    }

这样在运行的时候就会发生异常,

after-returning 定义的方法就不会运行
after-throwing 定义的方法就会运行
after 不管什么情况都会运行

 

posted on 2018-06-03 21:48  song.yan  阅读(218)  评论(0编辑  收藏  举报