直接上代码：

1.创建FIlter，往 MDC 里面追加内容

@WebFilter
@Component
public class LogBackFilter implements Filter {@Overridepublic void init(FilterConfig filterConfig) throws ServletException {}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)throws IOException, ServletException {// LOGSTASH 日志附加信息追加addMDC(request,response,chain);}@Overridepublic void destroy() {rmMDC();}private void addMDC(ServletRequest request, ServletResponse response, FilterChain chain){HttpServletRequest httpServletRequest = ((HttpServletRequest) request);String uuid = UUID.randomUUID().toString();MDC.put(LogConstant.REQUEST_ID, uuid);String remoteIp = request.getRemoteAddr();MDC.put(LogConstant.REQUEST_RM_IP, remoteIp);String remoteHost = request.getRemoteHost();MDC.put(LogConstant.REQUEST_RM_HOST, remoteHost);String uri =  httpServletRequest.getRequestURI();MDC.put(LogConstant.REQUEST_URI, uri);AuthUser authUser = UserContext.getCurrentUser();if(authUser!=null){MDC.put(LogConstant.REQUEST_USER_ID, authUser.getId());}}private void rmMDC(){MDC.remove(LogConstant.REQUEST_ID);MDC.remove(LogConstant.REQUEST_RM_IP);MDC.remove(LogConstant.REQUEST_RM_HOST);MDC.remove(LogConstant.REQUEST_URI);MDC.remove(LogConstant.REQUEST_USER_ID);}
}

2.logback配置:

includeMdcKeyName 标签 追加 mdc中的key

 <!--输出到elk的LOGSTASH--><appender name="LOGSTASH" class="net.logstash.logback.appender.LogstashTcpSocketAppender"><!-- 配置elk日志收集 配饰的是 LOGSTASH 的地址--><destination>${LOGSTASH_SERVER}</destination><encoder charset="UTF-8" class="net.logstash.logback.encoder.LogstashEncoder"><providers><timestamp><timeZone>UTC</timeZone></timestamp></providers><includeCallerData>true</includeCallerData><includeMdc>true</includeMdc><!-- MDC字段 --><includeMdcKeyName>X-Request-Id</includeMdcKeyName><includeMdcKeyName>X-Request-Uri</includeMdcKeyName><includeMdcKeyName>X-Request-UserId</includeMdcKeyName><includeMdcKeyName>X-Request-Rm-Ip</includeMdcKeyName><includeMdcKeyName>X-Request-Rm-Host</includeMdcKeyName><!--自定义字段 区分项目--><customFields>{"appName":"${APP_NAME}"}</customFields></encoder></appender>