01：Spring – AOP简介
02：Spring – 基于XML的AOP开发
03：Spring – 基于注解的AOP开发

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1. 快速入门

只要明白了基于XML的AOP开发，那么基于注解就很简单。

开发步骤：

准备工作：导入相关依赖

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><parent><artifactId>spring_study</artifactId><groupId>com.tian</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>spring_aop</artifactId><dependencies><!--        Spring依赖--><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.0.5.RELEASE</version></dependency><!--        aop织入依赖--><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.8.4</version></dependency><!--        spring-test依赖--><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.0.5.RELEASE</version></dependency><!--        junit单元测试--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.2</version></dependency></dependencies><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target></properties>
</project>

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示例代码：

TargetInterface.java

package com.tian.anno;public interface TargetInterface {public void save();
}

Target.java

package com.tian.anno;import org.springframework.stereotype.Component;@Component("target")
public class Target implements TargetInterface {public void save() {System.out.println("save running.....");}
}

MyAspect.java

package com.tian.anno;import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;@Component("myAspect")
@Aspect //标注当前MyAspect是一个切面类
public class MyAspect {//配置前置通知 @Before("execution(* com.tian.anno.*.*(..))")public void before() {System.out.println("前置增强..........");}@After("execution(* com.tian.anno.*.*(..))")public void afterReturning() {System.out.println("后置增强..........");}//Proceeding JoinPoint:  切点
//    @Around("execution(* com.tian.anno.*.*(..))")@Around("pointcut()")public Object around(ProceedingJoinPoint pjp) throws Throwable {System.out.println("环绕前增强....");Object proceed = pjp.proceed();//切点方法System.out.println("环绕后增强....");return proceed;}@AfterThrowing("MyAspect.pointcut()")public void afterThrowing() {System.out.println("异常抛出增强..........");}@After("MyAspect.pointcut()")public void after() {System.out.println("最终增强..........");}//定义切点表达式@Pointcut("execution(* com.tian.anno.*.*(..))")public void pointcut() {}
}

配置文件：

applicationContext.xml

配置组件扫描和aop自动代理即可

<?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"><!--组件扫描--><context:component-scan base-package="com.tian.anno"/><!--aop自动代理--><aop:aspectj-autoproxy/>
</beans>

测试代码：

AnnoTest.java

package test;import com.tian.anno.TargetInterface;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class AnnoTest {@Autowiredprivate TargetInterface target;@Testpublic void test1() {target.save();}
}

运行结果：

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2. 注解配置AOP详解

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2.1 注解通知的类型

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2.2 切点表达式的抽取

同xml配置 aop一样，我们可以将切点表达式抽取。抽取方式是在切面内定义方法，在该方法上使用@Pointcut注解定义切点表达式，然后在在增强注解中进行引用。具体如下:

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3. 小结

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