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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