使用注解实现AOP
首先在pom.xml中导入AOP织入的依赖包
<dependency>
<groupId>aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.5.3</version>
</dependency>
编写Service层
Service接口
public interface UserService {
public void add();
public void delete();
public void update();
public void query();
}
ServiceImpl层
public class UserServiceImpl implements UserService {
@Override
public void add() {
System.out.println("增加了一个用户");
}
@Override
public void delete() {
System.out.println("删除了一个用户");
}
@Override
public void update() {
System.out.println("修改了一个用户");
}
@Override
public void query() {
System.out.println("查询了一个用户");
}
}
编写注解类
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
/** 方式三:使用注解方式实现AOP
* @author Mi
* @version 1.0
* @description: TODO
* @date 2021/12/16 11:53
*/
@Aspect //标注这个类是一个切面
public class AnnotationPointCut {
@Before("execution(* com.example.springaopdemo.Service.UserServiceImpl.*(..))")
public void before(){
System.out.println("(注解方式)====方法执行前====");
}
@After("execution(* com.example.springaopdemo.Service.UserServiceImpl.*(..))")
public void after(){
System.out.println("(注解方式)====方法执行后====");
}
//在环绕增强中,我们可以给定一个参数,代表我们要获取处理切入的点;
@Around("execution(* com.example.springaopdemo.Service.UserServiceImpl.*(..))")
public void around(ProceedingJoinPoint pj) throws Throwable{
System.out.println("环绕前");
Signature signature = pj.getSignature(); //获得签名
System.out.println("signature: "+signature);
Object proceed = pj.proceed(); //执行方法
System.out.println("环绕后");
}
}
编写applicationContext.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.springframework.org/schema/beans"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
">
<!--注册bean-->
<bean id="userService" class="com.example.springaopdemo.Service.UserServiceImpl"/>
<!--方式三:使用注解方式实现AOP-->
<bean id="annotationPointCut" class="com.example.springaopdemo.diy.AnnotationPointCut"/>
<!--开启注解支持! JDK(默认 proxy-target-class="false" ) cglib( proxy-target-class="true")-->
<aop:aspectj-autoproxy proxy-target-class="true"/>
</beans>
测试文件
import com.example.springaopdemo.Service.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* @author Mi
* @version 1.0
* @description: TODO
* @date 2021/12/15 22:57
*/
public class MyTest {
public static void main(String[] args) {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
//动态代理代理的是接口
UserService userService = (UserService) context.getBean("userService");
userService.add();
}
}
文件详情
运行结果