Spring见解4 基于注解的AOP配置-编程知识

Spring见解4 基于注解的AOP配置

5.基于注解的AOP配置

5.1.创建工程

5.1.1.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"><modelVersion>4.0.0</modelVersion><groupId>com.by</groupId><artifactId>Spring_AOP_Annotation</artifactId><version>1.0-SNAPSHOT</version><dependencies><!-- Spring常用依赖 --><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.1.8.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aspects</artifactId><version>5.1.8.RELEASE</version></dependency></dependencies>
</project>

5.1.2.dao

@Repository
public class UserDaoImpl implements UserDao {@Overridepublic void addUser(){System.out.println("insert into tb_user......");}
}

5.1.3.service

@Service
public class UserServiceImpl implements UserService {@Autowiredprivate UserDao userDao;public void addUser() {userDao.addUser();}
}

5.1.4.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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd"><context:component-scan base-package="com.by"></context:component-scan>
</beans>

5.1.5.测试

/*** 模拟表现层*/
public class Client {public static void main(String[] args) {ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");//使用对象UserService userService = ac.getBean("userServiceImpl",UserService.class);userService.addUser();}
}

5.2.增强

5.2.1.applicationContext.xml

<!-- 开启spring对注解AOP的支持 -->
<aop:aspectj-autoproxy/>

3.2.3.AOP配置

常用注解
- @Aspect：把当前类声明为切面类
- @Before：前置通知，可以指定切入点表达式
- @AfterReturning：后置【try】通知，可以指定切入点表达式
- @AfterThrowing：异常【catch】通知，可以指定切入点表达式
- @After：最终【finally】通知，可以指定切入点表达式
- @Around：环绕通知，可以指定切入点表达式

注解方式实现aop

@Component
@Aspect
public class MyLogger {@Before("execution(* com.by.service.*.*(..))")public void before(){System.out.println("方法开始时间："+new Date());}@After("execution(* com.by.service.*.*(..))")public void after(){System.out.println("方法结束时间："+new Date());}
}