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思路就是spring 做切面拦截请求，切面入口时生成traceId，然后放到MDC里面（就是threadLocal，MDC是log框架提供的工具类，能方便在配置文件里面引用插入的值）。 切面结束时traceId。
 

import com.sing.monitor.api.CloudWatchApi;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.MDC;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.filter.OncePerRequestFilter;import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.UUID;/*** 生成traceId用的*/
@Component
@Slf4j
public class TraceIDFilter extends OncePerRequestFilter {@Autowiredprivate CloudWatchApi cloudWatchApi;@Overrideprotected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {try {try{String traceId = MDC.get("traceId");if(traceId == null){traceId = UUID.randomUUID().toString().substring(0, 8);MDC.put("traceId", traceId);}}catch (Exception e){log.error("generate traceId error", e);}filterChain.doFilter(request, response);} finally {try{MDC.remove("traceId");}catch (Exception e){log.error("remove traceId from MDC error", e);}}}
}

        <dependency><groupId>ch.qos.logback</groupId><artifactId>logback-classic</artifactId><version>1.2.11</version> <!-- 确保选择适合你项目的版本 --></dependency>

<?xml version="1.0" encoding="UTF-8"?>
<Configuration><property name="LOG_HOME" value="/data/wwwroot/backend/logs"/><property name="FILE_NAME" value="web-capi"/><appender name="Console" class="ch.qos.logback.core.ConsoleAppender"><encoder><pattern>%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%logger.java:%line][%X{traceId}] - %msg%n</pattern></encoder></appender><appender name="TraceIdRollingFileAppender" class="ch.qos.logback.core.rolling.RollingFileAppender"><file>${LOG_HOME}/${FILE_NAME}.log</file><rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"><!-- 每天生成一个新的日志文件 --><fileNamePattern>${LOG_HOME}/${date:yyyy-MM}/${FILE_NAME}-%d{yyyy-MM-dd}-%i.log.gz</fileNamePattern><!-- 保留30天的日志 --><maxHistory>30</maxHistory><!-- 当日志文件大小超过10MB时，开始滚动 --><timeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"><maxFileSize>10MB</maxFileSize></timeBasedFileNamingAndTriggeringPolicy></rollingPolicy><encoder><pattern>%date{yyyy-MM-dd HH:mm:ss.SSS} %level [%thread][%logger.java:%line][%X{traceId}] - %msg%n</pattern></encoder></appender><root level="info"><appender-ref ref="TraceIdRollingFileAppender" /><appender-ref ref="Console" /></root>
</Configuration>