SpringBoot中AOP的简单实现。

川长思鸟来 2022-05-20 22:57 177阅读 0赞

在SpringBoot中实现AOP很简单。  
1、添加依赖：

//注意依赖的版本

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-aop</artifactId>
    </dependency>

2、定义切面：  
WebLogAspect.java

package com.fangshuo.Aspect;
    
    import java.util.Arrays;
    
    import javax.servlet.http.HttpServletRequest;
    
    import org.apache.log4j.Logger;
    import org.aspectj.lang.JoinPoint;
    import org.aspectj.lang.annotation.AfterReturning;
    import org.aspectj.lang.annotation.Aspect;
    import org.aspectj.lang.annotation.Before;
    import org.aspectj.lang.annotation.Pointcut;
    import org.springframework.stereotype.Component;
    import org.springframework.web.context.request.RequestContextHolder;
    import org.springframework.web.context.request.ServletRequestAttributes;
    
    @Aspect  
    @Component  
    public class WebLogAspect {  
    
        private Logger logger = Logger.getLogger(getClass()); 
        @Pointcut("execution(public * com.fangshuo.controller.*.*(..))")  
        public void webLog(){}  
    
        @Before("webLog()")  
        public void doBefore(JoinPoint joinPoint) throws Throwable {  
            // 接收到请求，记录请求内容  
            ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes(); 
            HttpServletRequest request = attributes.getRequest(); 
    
            // 记录下请求内容  
            logger.info("URL : " + request.getRequestURL().toString()); 
            logger.info("HTTP_METHOD : " + request.getMethod()); 
            logger.info("IP : " + request.getRemoteAddr()); 
            logger.info("CLASS_METHOD : " + joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName()); 
            logger.info("ARGS : " + Arrays.toString(joinPoint.getArgs())); 
    
        }  
    
        @AfterReturning(returning = "ret", pointcut = "webLog()")  
        public void doAfterReturning(Object ret) throws Throwable {  
            // 处理完请求，返回内容  
            logger.info("RESPONSE : " + ret);
        }  
    
    }

整个AOP的代码结构如下:  
![这里写图片描述][70]

注意点：

在后置通知中returning = “ret”中定义的参数名必须和通知方法受那个的参数匹配，即returning = “ret”中定义的是ret,通知方法中也必须是”ret”,否则将抛出异常。

@AfterReturning(returning = "ret", pointcut = "webLog()")  
        public void doAfterReturning(Object ret) throws Throwable {  
            // 处理完请求，返回内容 
            logger.info("RESPONSE : " + ret);
        }

3、参考文章：  
[spring aop 面向切面编程初接触][spring aop]  
[Spring AOP(二)之AfterReturning增强处理][Spring AOP_AfterReturning]

[70]: /images/20220521/f7960b1c27304605bff0b16904315467.png
[spring aop]: https://www.cnblogs.com/lic309/p/4079194.html
[Spring AOP_AfterReturning]: https://blog.csdn.net/owen_william/article/details/50812771