spring通知的注解

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1、代理类接口Person.java

 package com.xiaostudy;

 /**
  * @desc 被代理类接口
  *
  * @author xiaostudy
  *
  */
 public interface Person {

     public void add();
     public void update();
     public void delete();
 }

2、代理类PersonImple.java

 package com.xiaostudy;

 import org.springframework.stereotype.Component;

 /**
  * @desc 被代理类
  *
  * @author xiaostudy
  *
  */
 @Component("person")//类注解
 public class PersonImple implements Person {

     /**
      * @desc 实现接口方法
      */
     public void add() {
         System.out.println("add().....");
     }

     @Override
     public void update() {
         System.out.println("update().....");
 //        int i = 1/0;
     }

     @Override
     public void delete() {
         System.out.println("delete().....");
     }

 }

3、通知类MyAspectJ.java

 package com.xiaostudy;

 import org.aspectj.lang.JoinPoint;
 import org.aspectj.lang.ProceedingJoinPoint;
 import org.aspectj.lang.annotation.After;
 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.stereotype.Component;

 /**
  * @desc 通知类
  *
  * @author xiaostudy
  *
  */
 @Component//类注解
 @Aspect//AspectJ注解
 public class MyAspectJ {

     //声明公共切入点
     @Pointcut("execution(* com.xiaostudy.PersonImple.*(..))")
     public void myPointcut() {

     }

     //前置通知注解，只有一个参数时，value可以省略不写
     @Before("execution(* com.xiaostudy.PersonImple.*(..))")
     public void myBefort(JoinPoint joinPoint) {
         System.out.println("前置通知>>>>>>>>>joinPoint: " + joinPoint.getSignature().getName());
     }

     //后置通知注解，当参数大于1时，value必须写
     @AfterReturning(value="myPointcut()", returning="ret")
     public void myAfterReturning(JoinPoint joinPoint, Object ret) {
         System.out.println("后置通知>>>>>>>>>joinPoint: " + joinPoint.getSignature().getName()
                 + ", ret: " + ret);
     }

     //环绕通知注解
     @Around("myPointcut()")
     public Object myAround(ProceedingJoinPoint joinPoint) throws Throwable {
         System.out.println("环绕通知====前>>>>>>>>>>>");
         Object obj = joinPoint.proceed();
         System.out.println("环绕通知====后<<<<<<<<<<<");
         return obj;
     }

     //异常通知注解
     @AfterThrowing(value="myPointcut()", throwing="e")
     public void myThrowint(JoinPoint joinPoint, Throwable e) {
         System.out.println("异常通知>>>>>>>>>joinPoint: " + joinPoint.getSignature().getName()
                 + ", e: " + e.getMessage());
         System.exit(0);
     }

     //最终通知注解
     @After("myPointcut()")
     public void myAfter(JoinPoint joinPoint) {
         System.out.println("最终通知>>>>>>>>>joinPoint: " + joinPoint.getSignature().getName());
     }
 }

4、spring配置文件applicationContext.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:aop="http://www.springframework.org/schema/aop"
        xmlns:context="http://www.springframework.org/schema/context"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
                               http://www.springframework.org/schema/beans/spring-beans.xsd
                               http://www.springframework.org/schema/aop
                               http://www.springframework.org/schema/aop/spring-aop.xsd
                               http://www.springframework.org/schema/context
                               http://www.springframework.org/schema/context/spring-context.xsd">
     <!-- 扫描注解类 -->
     <context:component-scan base-package="com.xiaostudy"></context:component-scan>
     <!-- 确定 AOP注解生效 -->
     <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
 </beans>

5、测试类Test.java

 package com.xiaostudy;

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

 /**
  * @desc 测试类
  *
  * @author xiaostudy
  *
  */
 public class Test {

     public static void main(String[] args) {
         ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
         Person person = ac.getBean("person", Person.class);
         person.add();
         person.update();
         person.delete();
     }

 }

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