package com.xf.config;

import java.util.Date;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.MDC;
import org.springframework.web.servlet.HandlerInterceptor;

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.util.IdUtil;
import
 
 lombok.extern.slf4j.Slf4j;

@Slf4j
public class RequestInterceptor implements HandlerInterceptor {
    public static final String REQUEST_ID_KEY = "request-id";

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        MDC.put(REQUEST_ID_KEY, getRequestId(request));
        log.info(
 
"攔截一下哦");
        return HandlerInterceptor.super.preHandle(request, response, handler);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
        // 把requestId新增到響應頭，以便其它應用使用
        response.addHeader(REQUEST_ID_KEY, MDC.get(REQUEST_ID_KEY));
        
 
// 請求完成，從MDC中移除requestId
        MDC.remove(REQUEST_ID_KEY);
    }

    public static String getRequestId(HttpServletRequest request) {
        String requestId;
        String parameterRequestId = request.getParameter(REQUEST_ID_KEY);
        String headerRequestId = request.getHeader(REQUEST_ID_KEY);
        // 根據請求引數或請求頭判斷是否有“request-id”，有則使用，無則建立
        if (parameterRequestId == null && headerRequestId == null) {
            requestId = DateUtil.format(new Date(), "yyyyMMddHHmmssSSS") + IdUtil.simpleUUID().substring(0, 5);
        } else {
            requestId = parameterRequestId != null ? parameterRequestId : headerRequestId;
        }
        return requestId;
    }
}

<property name="log.pattern"
        value="%X{request-id} %-5level %logger{200} - [%method,%line] - %msg%n" />