Spring（二）aspect

参考链接：
https://blog.csdn.net/u011983531/article/details/70504281
https://blog.csdn.net/qq_41767337/article/details/89077073
结构

依赖

<dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.5.RELEASE</version>
</dependency><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.9.4</version>
</dependency>

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"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/aophttps://www.springframework.org/schema/aop/spring-aop.xsd"><!--注册bean--><bean id="myService" class="aop.MyServiceImpl" /><bean id="myService2" class="aop.MyService2" /><bean id="log" class="aop.Log" /><aop:config><aop:aspect ref="log"><aop:pointcut id="pointcut" expression="execution(* aop.MyServiceImpl.*(..))" /><aop:before method="before" pointcut-ref="pointcut" /><aop:before method="before2" pointcut-ref="pointcut" /><aop:after method="after" pointcut-ref="pointcut" /></aop:aspect><aop:aspect ref="log"><aop:pointcut id="pointcut2" expression="execution(* aop.MyService2.*(..))" /><aop:before method="before" pointcut-ref="pointcut2" /><aop:before method="before2" pointcut-ref="pointcut2" /><aop:after method="after" pointcut-ref="pointcut2" /></aop:aspect></aop:config></beans>

代码
MyService

public interface MyService {void m1();String m2();
}

**MyServiceImpl **

public class MyServiceImpl implements MyService {public void m1() {System.out.println("执行方法m1");}public String m2() {System.out.println("执行方法m2：返回Hello World!");return "Hello World!";}
}

**MyService2 **

public class MyService2 {public void m1() {System.out.println("执行方法m1");}public String m2() {System.out.println("执行方法m2：返回Hello World!");return "Hello World!";}
}

Log

import org.aspectj.lang.JoinPoint;public class Log {public void before(JoinPoint joinPoint) {System.out.println("前置通知：" + joinPoint.getTarget().getClass().getSimpleName()+ "的"+joinPoint.getSignature().getName()+ "方法开始执行");}public void before2(JoinPoint joinPoint) {System.out.println("前置通知2：" + joinPoint.getTarget().getClass().getSimpleName()+ "的"+joinPoint.getSignature().getName()+ "方法开始执行");}public void after() {System.out.println("后置通知");}}

测试代码

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class AopTest {public static void main(String[] args) {System.out.println("加载xml文件");String xmlPath = "applicationContext.xml";ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlPath);MyService myServiceImpl = applicationContext.getBean("myService", MyService.class);MyService2 myService2 = applicationContext.getBean("myService2", MyService2.class);myServiceImpl.m1();System.out.println("---------");myServiceImpl.m2();System.out.println("---------");myService2.m1();System.out.println("---------");myService2.m2();}}

结果输出

加载xml文件
前置通知：MyServiceImpl的m1方法开始执行
前置通知2：MyServiceImpl的m1方法开始执行
执行方法m1
后置通知
---------
前置通知：MyServiceImpl的m2方法开始执行
前置通知2：MyServiceImpl的m2方法开始执行
执行方法m2：返回Hello World!
后置通知
---------
前置通知：MyService2的m1方法开始执行
前置通知2：MyService2的m1方法开始执行
执行方法m1
后置通知
---------
前置通知：MyService2的m2方法开始执行
前置通知2：MyService2的m2方法开始执行
执行方法m2：返回Hello World!
后置通知