Spring框架中的AOP技术----注解方式

利用AOP技术注解的方式对功能进行增强

CustomerDao接口

package com.alphajuns.demo1;

public interface CustomerDao {

    public void save();
    
    public void update();
    
}

CustomerDaoImpl实现类

package com.alphajuns.demo1;

public class CustomerDaoImpl implements CustomerDao {

    @Override
    public void save() {
        System.out.println("保存客户...");
    }

    @Override
    public void update() {
        System.out.println("更新客户...");
    }

}

切面类

package com.alphajuns.demo1;

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;

/*
 * 注解方式的切面类
 */
@Aspect
public class MyAspectAnno {

    /*
     * 前置通知
     */
    @Before(value="execution(public void com.alphajuns.demo1.CustomerDaoImpl.save())")
    public void log() {
        System.out.println("记录日志...");
    }
    
    /*
     * 后置通知
     */
    /*@After(value="execution(public void com.alphajuns.demo1.CustomerDaoImpl.save())")*/
    @After(value="MyAspectAnno.fn()")
    public void after() {
        System.out.println("更新日志...");
    }
    
    @Around(value="execution(public void com.alphajuns.demo1.CustomerDaoImpl.save())")
    public void around(ProceedingJoinPoint joinPoint) {
        System.out.println("环绕通知1...");
        try {
            joinPoint.proceed();
        } catch (Throwable e) {
            e.printStackTrace();
        }
        System.out.println("环绕通知2...");
    }
    
    /*
     * 自定义切入点
     */
    @Pointcut(value="execution(public * com.alphajuns.demo1.CustomerDaoImpl.save())")
    public void fn(){};
    
}

测试类

package com.alphajuns.demo1;

import javax.annotation.Resource;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class Demo1 {

    @Resource(name="customerDao")
    private CustomerDao customerDao;
    
    @Test
    public void run1() {
        customerDao.save();
    }
    
}

配置文件

<?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:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx.xsd">
    
    <!-- 开启自动代理 -->
    <aop:aspectj-autoproxy/>
    
    <!-- 创建目标对象 -->
    <bean id="customerDao" class="com.alphajuns.demo1.CustomerDaoImpl"/>
    
    <!-- 创建切面类 -->
    <bean id="myAspectAnno" class="com.alphajuns.demo1.MyAspectAnno"/>
    
</beans>