SpringBoot+Logback实现一个简单的链路追踪功能

/**
 * 日志拦截器
 * @Author: Java碎碎念
 *
 */
public class SessionInterceptor extends HandlerInterceptorAdapter {
  /**
   * 会话ID
   */
  private final static String SESSION_KEY = "sessionId";


  @Override
  public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
              Object arg2, ModelAndView arg3) throws Exception {
  }

  @Override
  public boolean preHandle(HttpServletRequest request,
               HttpServletResponse response, Object handler) throws Exception {

//    String token = UUID.randomUUID().toString().replaceAll("-","");
    //本例测试使用sessionId，也可以使用UUID等
    String token = request.getSession().getId();
    MDC.put(SESSION_KEY, token);
    return true;
  }

  @Override
  public void afterCompletion(HttpServletRequest arg0,
                HttpServletResponse arg1, Object arg2, Exception arg3)
      throws Exception {
    // 删除
    MDC.remove(SESSION_KEY);
  }
}

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

  @Bean
  public SessionInterceptor getSessionInterceptor() {
    return new SessionInterceptor();
  }

  @Override
  public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(getSessionInterceptor()).addPathPatterns("/*");
  }
}

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <property name="log.base" value="./log/logback"/>
  <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern> %date [%thread] [%X{sessionId}] %-5level %logger{80} - %msg%n
      </pattern>
    </encoder>
  </appender>

  <appender name="logfile"
       class="ch.qos.logback.core.rolling.RollingFileAppender">
    <File>${log.base}.log</File>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
      <FileNamePattern>${log.base}.%d{yyyy -MM-dd}.log.zip</FileNamePattern>
    </rollingPolicy>
    <encoder>
      <pattern> %date [%thread] [%X{sessionId}] %-5level %logger{80} - %msg%n
      </pattern>
    </encoder>
  </appender>
  <logger name="com.sample" level="TRACE"/>
  <root>
    <level value="INFO"/>
    <appender-ref ref="stdout"/>
    <appender-ref ref="logfile"/>
  </root>
</configuration>

@RestController
public class TestLogController {
  Logger log = LoggerFactory.getLogger(getClass());
  /**
   * 测试登录
   */
  @RequestMapping(value = "/testLogin")
  public String testLogin() {
    log.info("用户登录成功！");
    return "ok";
  }
  /**
   * 测试下单
   */
  @RequestMapping(value = "/testNewOrder")
  public String testNewOrder() {
    log.info("用户创建了订单！");
    log.info("请求完成，返回ok！");
    return "ok";
  }
  /**
   * 测试购买
   */
  @RequestMapping(value = "/testPay")
  public String testPay() {
    log.info("用户付款！");
    return "ok";
  }
}