AOP面向切面编程简单介绍 - ToB企服应用市场:ToB评测及商务社交产业平台

<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.3.18</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.9.6</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.3.18</version>
</dependency>

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<?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/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xs">
<context:component-scan base-package="com.bing"/>
<aop:aspectj-autoproxy />
</beans>

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package com.bing.aspect;
import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;
/**
* @Author IBing
* @Date 2022/8/26 22:01
* @Version 1.0
*/
@Aspect //表示这是一个切面类
@Component //将对象放入spring容器
public class UserAspect {
//开启日志
private Logger logger = Logger.getLogger(UserAspect.class);
/**
* 目标方法执行之前执行
* @param joinPoint
*/
@Before("execution(public com.bing.entity.User com.bing.service.impl.UserServiceImpl.login(java.lang.String,java.lang.String))")
public void before(JoinPoint joinPoint){
logger.debug("before");
logger.debug("拦截的目标对象"+joinPoint.getTarget());
logger.debug("拦截的方法"+joinPoint.getSignature().getDeclaringTypeName()+joinPoint.getSignature().getName());
logger.debug("拦截的参数"+joinPoint.getArgs());
logger.debug("拦截的位置"+joinPoint.getStaticPart());
logger.debug("拦截的代理对象"+joinPoint.getStaticPart());
}
/**
* 无论是否抛出异常都会执行，相当于finally
* @param joinPoint
*/
@After("execution(public com.bing.entity.User com.bing.service.impl.UserServiceImpl.login(java.lang.String,java.lang.String))")
public void after(JoinPoint joinPoint){
logger.debug("after");
logger.debug("拦截的目标对象"+joinPoint.getTarget());
logger.debug("拦截的方法"+joinPoint.getSignature().getDeclaringTypeName()+joinPoint.getSignature().getName());
logger.debug("拦截的参数"+joinPoint.getArgs());
logger.debug("拦截的位置"+joinPoint.getStaticPart());
logger.debug("拦截的代理对象"+joinPoint.getStaticPart());
}
/**
* 相当于try
* @param joinPoint
*/
@AfterReturning("execution(public com.bing.entity.User com.bing.service.impl.UserServiceImpl.login(java.lang.String,java.lang.String))")
public void afterReturning(JoinPoint joinPoint){
logger.debug("afterReturning");
logger.debug("拦截的目标对象"+joinPoint.getTarget());
logger.debug("拦截的方法"+joinPoint.getSignature().getDeclaringTypeName()+joinPoint.getSignature().getName());
logger.debug("拦截的参数"+joinPoint.getArgs());
logger.debug("拦截的位置"+joinPoint.getStaticPart());
logger.debug("拦截的代理对象"+joinPoint.getStaticPart());
}
/**
* 相当于catch
* @param joinPoint
* @param e
*/
@AfterThrowing(value="execution(public com.bing.entity.User com.bing.service.impl.UserServiceImpl.login(java.lang.String,java.lang.String))",throwing ="e" )
public void afterThrowing(JoinPoint joinPoint,RuntimeException e){
logger.debug("afterThrowing");
logger.debug("拦截的目标对象"+joinPoint.getTarget());
logger.debug("抛出的异常为",e);
}
/**
* 环绕执行
* @param pjd
* @return
* @throws Throwable
*/
@Around("execution(public com.bing.entity.User com.bing.service.impl.UserServiceImpl.login(java.lang.String,java.lang.String))")
public Object around(ProceedingJoinPoint pjd) throws Throwable {
logger.debug("around之前");
Object proceed= pjd.proceed();
logger.debug("around之后");
return proceed;
}
}

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@Test
public void test( ){
//创建spring的容器并初始化
ClassPathXmlApplicationContext classPathXmlApplicationContext = new ClassPathXmlApplicationContext("beans.xml");
String[] beanNameForType = classPathXmlApplicationContext.getBeanNamesForType(UserController.class);
System.out.println(Arrays.toString(beanNameForType));
UserController bean = (UserController) classPathXmlApplicationContext.getBean("userController");
bean.login("aa","123"); //这是 UserController 里写好的login方法
classPathXmlApplicationContext.close();
}

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直接精准到一个方法上面去
execution( public com.bing.entity.User com.bing.service.impl.UserServiceImpl.login(java.lang.String,java.lang.String))
任意权限修饰符
execution( com.bing.entity.User com.bing.service.impl.UserServiceImpl.login(java.lang.String,java.lang.String))
无返回类型
execution( void com.bing.service.impl.UserServiceImpl.login(java.lang.String,java.lang.String))
有返回类型
execution( !void com.bing.service.impl.UserServiceImpl.login(java.lang.String,java.lang.String))
任意返回类型
execution( * com.bing.service.impl.UserServiceImpl.login(java.lang.String,java.lang.String))
任意参数
execution( * com.bing.service.impl.UserServiceImpl.login(..))
类中的任意方法
execution( * com.bing.service.impl.UserServiceImpl.*(..))
类中以指定内容开头的方法
execution( * com.bing.service.impl.UserServiceImpl.select*(..))
包中的任意类的任意方法不包含子包下面的类
execution( * com.bing.service.impl.*.*(..))
包中及其下的任意类的任意方法
execution( * com.bing.service..*.*(..))

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