详解如何为SpringBoot Web应用的日志方便追踪

/**
 * A filter that adds a key to the Mapped Diagnostic Context (MDC) to each request so you can print a unique id in the log messages of each request
 **/
@EqualsAndHashCode(callSuper = false)
@Component
@Slf4j
public class Slf4jMDCFilter extends OncePerRequestFilter {

    @Override
    protected void doFilterInternal(final HttpServletRequest request, final HttpServletResponse response, final FilterChain chain) {
        try {
            MDC.put(MDC_UUID_TOKEN_KEY, UUID.randomUUID().toString());
            chain.doFilter(request, response);
        } catch (Exception ex) {
            log.error(ERROR_FORMAT, "Exception occurred in filter while setting UUID for logs", ex);
        } finally {
            MDC.remove(MDC_UUID_TOKEN_KEY);
        }
    }

    @Override
    protected boolean isAsyncDispatch(final HttpServletRequest request) {
        return false;
    }

    @Override
    protected boolean shouldNotFilterErrorDispatch() {
        return false;
    }
}

@Configuration
@RequiredArgsConstructor
public class BeanConfig {
    private final Slf4jMDCFilter slf4jMDCFilter;

    @Bean
    public FilterRegistrationBean<Slf4jMDCFilter> servletRegistrationBean() {
        final FilterRegistrationBean<Slf4jMDCFilter> filterRegistrationBean = new FilterRegistrationBean<>();
        filterRegistrationBean.setFilter(slf4jMDCFilter);
        filterRegistrationBean.setOrder(2);
        return filterRegistrationBean;
    }
}

<appender name="Console"
  class="ch.qos.logback.core.ConsoleAppender">
  <layout class="ch.qos.logback.classic.PatternLayout">
    <Pattern>
      %black(%d{ISO8601}) %X{Slf4jMDCFilter.UUID} %highlight(%-5level) [%blue(%t)] %yellow(%C{1.}): %msg%n%throwable
    </Pattern>
  </layout>
</appender>