Spring框架学习第五讲（AOP操作——注解实现）

一、 基于AspectJ的注解实现AOP操作

1.1 导入Spring基本JAR包

1.2 创建被增强类和增强类

1. 被增强类Book，实例注解方式创建Book Bean

package com.spring.annotationAOP;import org.springframework.stereotype.Component;@Component("book")public class Book {    public void add(){        System.out.println("book add...");    }}

1. 增强类Mybook，实例注解方式创建Book Bean

2. 在增强类上需要添加@Aspect注解

3. 在增强的方法上需要添加下面五种注解声明通知方法
   
   • @Before – 前置增强
   • @Before – 后置增强
   • @AfterReturning – 后置增强
   • @AfterThrowing –抛出异常后增加
   • @Around –前后增强

package com.spring.annotationAOP;import org.aspectj.lang.annotation.After;import org.aspectj.lang.annotation.Aspect;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Component;@Component("myBook")@Aspectpublic class Mybook {    @Autowired    private Book book;    @After("execution(* com.spring.annotationAOP.Book.*(..))")    //使用注解方式，表达式添加切入点    public void afterAdd(){        System.out.println("mybook add...");    }}

1.3 配置Spring核心文件bean3.xml

1. 需要开启AOP自动代理
2. 需要添加相应的schema约束(aop,context)

<?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" 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"> <!-- bean definitions here -->    <!-- 开启注解扫描，在包里面扫描类、方法、属性上面是否有注解 -->    <context:component-scan base-package="com.spring.annotationAOP"></context:component-scan>    <!-- 开启AOP自动代理 -->    <aop:aspectj-autoproxy></aop:aspectj-autoproxy></beans>

1.4 测试代码

package test;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.spring.annotationAOP.Book;public class AOPannotationTest {    @Test    public void testAopAnnotation(){        ApplicationContext context = new ClassPathXmlApplicationContext("aopAnnotation.xml");        Book book = (Book) context.getBean("book");        book.add();    }}

1.5 输出结果

book add...mybook add...