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 {
@Override
public void addUser(){
System.out.println("insert into tb_user......");
}
}
5.1.3.service
@Service
public class UserServiceImpl implements UserService {
@Autowired
private 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/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/context
http://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()); } }