Spring Boot在异常上不是日志映射的诊断上下文(MDC)



我需要在日志中映射诊断上下文数据。应用程序构建:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.8.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

要在日志中获取MDC,我放入 application.properties 文件:

logging.pattern.level=%X{mdcData}%5p

并创建一个类

@Component
public class RequestFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        try {
            // Setup MDC data:
            String mdcData = String.format("[userId:%s | requestId:%s] ", "hello", "hello");
            MDC.put("mdcData", mdcData); //Variable 'mdcData' is referenced in Spring Boot's logging.pattern.level property
            chain.doFilter(request, response);
        } finally {
           // Tear down MDC data:
           // ( Important! Cleans up the ThreadLocal data again )
            MDC.clear();
        }
    }
...
}

当我使用 log.info("message here")之类的方法调用时,MDC数据出现在日志中。我尝试使用级别信息,警告,错误 - 很好。但是,当我在控制器中获取 RuntimeException 时,我会在 error celver中看到堆栈跟踪,但没有提供MDC数据。

>

我该怎么做才能在例外的日志中获取MDC数据?

您可以在 MDC.clear()之前写一个块 catching异常,以便在下面登录 doFilter

        try {
            // Setup MDC data:
            String mdcData = String.format("[userId:%s | requestId:%s] ", "hello", "hello");
            MDC.put("mdcData", mdcData); //Variable 'mdcData' is referenced in Spring Boot's logging.pattern.level property
            chain.doFilter(request, response);
        } catch (Exception e) {
            log.error("", e);
        } finally {
           // Tear down MDC data:
           // ( Important! Cleans up the ThreadLocal data again )
            MDC.clear();
        }

它将记录器从Directjdklog更改为请求Filter。

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