使用AOP实现打印日志

首先创建annotation.SystemLog类：

package com.gjh.annotation;import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;@Target(ElementType.METHOD) //加在什么东西上
@Retention(RetentionPolicy.RUNTIME) //什么时候
public @interface SystemLog {String BusinessName(); //会以注解方式用在接口上
}

然后创建aspect.LogAspect：

package com.gjh.aspect;import com.alibaba.fastjson.JSON;
import com.gjh.annotation.SystemLog;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;import javax.servlet.http.HttpServletRequest;@Component
@Aspect
@Slf4j
public class LogAspect {@Pointcut("@annotation(com.gjh.annotation.SystemLog)")public void pt(){}@Around("pt()")public Object printLog(ProceedingJoinPoint joinPoint) throws Throwable {Object ret;try {handleBefore(joinPoint);ret = joinPoint.proceed();handleAfter(ret);} finally {// 结束后换行log.info("=======End=======" + System.lineSeparator());}return ret;}//切入点之前运行private void handleBefore(ProceedingJoinPoint joinPoint) {ServletRequestAttributes requestAttributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();HttpServletRequest request = requestAttributes.getRequest();//获取被增强的方法上的注解对象SystemLog systemLog = getSystemLog(joinPoint);log.info("=======Start=======");// 打印请求 URLlog.info("URL            : {}",request.getRequestURL());// 打印描述信息log.info("BusinessName   : {}", systemLog.BusinessName());// 打印 Http methodlog.info("HTTP Method    : {}",request.getMethod());// 打印调用 controller 的全路径以及执行方法log.info("Class Method   : {}.{}",joinPoint.getSignature().getDeclaringTypeName(),((MethodSignature)joinPoint.getSignature()).getName());// 打印请求的 IPlog.info("IP             : {}",request.getRemoteHost());// 打印请求入参log.info("Request Args   : {}", JSON.toJSONString(joinPoint.getArgs()));}private SystemLog getSystemLog(ProceedingJoinPoint joinPoint) {MethodSignature methodSignature =(MethodSignature) joinPoint.getSignature();SystemLog systemLog = methodSignature.getMethod().getAnnotation(SystemLog.class);return systemLog;}//切入点之后运行private void handleAfter(Object ret) {// 打印出参log.info("Response       : {}", JSON.toJSONString(ret));}
}

最后，在需要的接口上使用注解：

 @SystemLog(BusinessName = "更新用户信息")

例如我用在了：

@PutMapping("/userInfo")@Operation(tags = "修改个人信息")@SystemLog(BusinessName = "更新用户信息") //AOPpublic ResponseResult updateUserInfo(@RequestBody UserInfoDTO userInfoDTO){return ResponseResult.okResult(userservice.UpdateUserInfo(userInfoDTO));}

重启测试：

当我们进行修改个人信息之后：