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請參考：
https://blog.csdn.net/MadLifeBin/article/details/120332483

可搭建單機版用于 Demo 測試

服務提供與消費

請參考：
https://blog.csdn.net/MadLifeBin/article/details/120420139

全鏈路監控

添加日志支持

maven添加依賴

版本參考父POM

<dependency>
  <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>log4j-over-slf4j</artifactId>
</dependency>
<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>jcl-over-slf4j</artifactId>
</dependency>

服務雙方添加日志配置文件

服務雙方增加過濾器為每個請求創建traceId

啟動類增加注解@ServletComponentScan

@Order(1)
@WebFilter(urlPatterns = "/*",filterName = "traceIdFilter")
public class TraceIdFilter implements Filter {

    public final static String MDC_TRACE_ID = "traceId";

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        String traceId = httpRequest.getHeader(MDC_TRACE_ID);
        if (StringUtils.isBlank(traceId)) {
            traceId = IdUtil.fastSimpleUUID();;
        }
        MDC.put(MDC_TRACE_ID, traceId);
        ThreadLocalUtils.setTraceId(traceId);
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        httpResponse.setHeader(MDC_TRACE_ID, traceId);
        chain.doFilter(request, response);
    }
}

同時將traceId寫回到response的header中，方便在前端獲取traceId.

consumer配置OpenFeign透傳traceId

@Component
public class OpenFeignRequestInterceptor implements RequestInterceptor {

    @Override
    public void Apply(RequestTemplate requestTemplate) {
        String traceId = MDC.get(TraceIdFilter.MDC_TRACE_ID);
        requestTemplate.header(TraceIdFilter.MDC_TRACE_ID, traceId);
    }
}

測試

服務雙方的調用鏈路上增加打印日志語句

LOGGER.info("userId:{}",userId);

consumer

provider

根據traceId追蹤日志

1. 啟動Eureka、Provider、Consumer
2. 瀏覽器調用接口，在瀏覽器控制臺拿到traceId
3. 分別去對應服務的日志查找具體日志行。

若搭配上阿里云的 SLS 或者 自行搭建的 EFLK，全鏈路日志只會更加方便