在微服务架构自然环境中,大家常常应用Skywalking、CAT等去完成总体要求链接的跟踪,可是这一总体运维管理成本增加,构架繁杂,大家来应用MDC根据Log来完成一个轻量的对话事务管理追踪作用。
MDC org.sl4j.MDC实际上內部便是ThreadLocal,MDC出示了put/get/clear等好多个关键插口,用以实际操作ThreadLocal中的数据信息;ThreadLocal中的K-V,能够在logback.xml中申明,最后可能打印出在日志中。
- // java编码
- MDC.put("userId","laker");
- // logback.xml
- %X{userId}
比如:
- <property name="pattern" value="%d{HH:mm:ss.SSS} [%thread] %-5level [%X{userId}] %logger{20} - %msg%n"/>
总体步骤以下:
- @Order(value = Ordered.HIGHEST_PRECEDENCE 100)
- @Component
- @WebFilter(filterName = "MDCFilter", urlPatterns = "/*")
- public class MDCFilter extends OncePerRequestFilter {
- @Override
- protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
- try {
- MDC.put("userId", "laker");
- MDC.put("requestId", IdUtil.fastUUID());
- } catch (Exception e) {
- //
- }
- try {
- filterChain.doFilter(httpServletRequest, httpServletResponse);
- } finally {
- MDC.clear();
- }
- }
- }
logback.xml
- <?xml version="1.0" encoding="UTF-8"?>
- <configuration>
- <property name="LOG_HOME" value="logs"/>
- <property name="encoding" value="UTF-8"/>
- <appender name="DEFAULT" class="ch.qos.logback.core.rolling.RollingFileAppender">
- <file>${LOG_HOME}/test.log</file>
- <Append>true</Append>
- <prudent>false</prudent>
- <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
- <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{50} %line - %m%n</pattern>
- </encoder>
- <!-- 按天回退 daily -->
- <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
- <!--存档日志文件夹名称-->
- <FileNamePattern>${LOG_HOME}/test.log.%d{yyyy-MM-dd}</FileNamePattern>
- <!-- 数最多储存半个月历史时间文档 -->
- <maxHistory>15</maxHistory>
- </rollingPolicy>
- </appender>
- <!-- 日志輸出文件格式 -->
- <property name="log.pattern"
- value="%d{HH:mm:ss.SSS} [%thread] %-5level [%X{userId}|%X{requestId}] %logger{20} - [%method,%line] - %msg%n"/>
- <!-- 控制面板輸出 -->
- <appender name="console" class="ch.qos.logback.core.ConsoleAppender">
- <encoder>
- <pattern>${log.pattern}</pattern>
- </encoder>
- </appender>
- <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
- <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
- <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{50} %line - %m%n</pattern>
- </encoder>
- </appender>
- <logger name="com.test.demo" level="DEBUG">
- <appender-ref ref="DEFAULT"/>
- </logger>
- <!-- 日志輸出等级 -->
- <root level="INFO">
- <appender-ref ref="DEFAULT"/>
- <appender-ref ref="console"/>
- </root>
- </configuration>
- public class Response<T> {
- @ApiModelProperty(notes = "回应码,非200 即是异常", example = "200")
- private final int code;
- @ApiModelProperty(notes = "回应信息", example = "操作成功")
- private final String msg;
- @ApiModelProperty(notes = "回应数据信息")
- private final T data;
- @ApiModelProperty(notes = "要求id")
- private final String requestId;
- public Response(int code, String msg, T data) {
- this.code = code;
- this.msg = msg;
- this.data = data;
- this.requestId = MDC.get("requestId");
- }
回应
- {
- code: 200,
- msg: "",
- requestId: "74a269a8-3cb4-417e-853c-b968b77cce23"
- }
日志
- 18:37:15.997 [http-nio-8080-exec-1] INFO [laker|90717490-5ef4-4e46-bc2c-605952fc3803] c.l.m.c.InfoController - [v2Map,17] - null
- 18:37:38.980 [http-nio-8080-exec-2] INFO [laker|82bde351-f86e-466f-97a0-c857a0c4c1c9] c.l.m.c.InfoController - [v2Map,17] - null
- 18:37:39.992 [http-nio-8080-exec-3] INFO [laker|74a269a8-3cb4-417e-853c-b968b77cce23] c.l.m.c.InfoController - [v2Map,17] - null