Slf4j，logback - 从 json 中删除 mdc 标签答案

【问题标题】：Slf4j, logback - removing mdc tag from jsonSlf4j，logback - 从 json 中删除 mdc 标签
【发布时间】：2020-01-20 12:01:27
【问题描述】：

我正在使用 MDC 将上下文信息添加到日志记录中：

MDC.put("Correlation-ID", UUID.randomUUID().toString());

我正在使用以下 logback 编码器：

    <encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
        <layout class="ch.qos.logback.contrib.json.classic.JsonLayout">
            <timestampFormat>yyyy-MM-dd'T'HH:mm:ss.SSSX</timestampFormat>
            <timestampFormatTimezoneId>Etc/UTC</timestampFormatTimezoneId>
            <appendLineSeparator>true</appendLineSeparator>

            <jsonFormatter class="ch.qos.logback.contrib.jackson.JacksonJsonFormatter">
                <prettyPrint>false</prettyPrint>
            </jsonFormatter>
        </layout>
    </encoder>

我有以下日志：

{"timestamp":"2020-01-20T11:40:09.850Z","level":"INFO","thread":"main","mdc":{"Correlation-ID":"66f7843c-9855-450d-ad97-b1c78404f051"},"logger":"liquibase.Liquibase"...

我想删除根 mdc 标记以获取：

{"timestamp":"2020-01-20T11:40:09.850Z","level":"INFO","thread":"main","Correlation-ID":"66f7843c-9855-450d-ad97-b1c78404f051","logger":"liquibase.Liquibase"...

我将如何实现这一目标？

【问题讨论】：

标签： java logback mdc

【解决方案1】：

这是一个简单的解决方案，使用<includeMDC>false</includeMDC>

<layout class="ch.qos.logback.contrib.json.classic.JsonLayout">
               <appendLineSeparator>true</appendLineSeparator>
              <includeMDC>false</includeMDC>
            <jsonFormatter
                class="ch.qos.logback.contrib.jackson.JacksonJsonFormatter">
                <prettyPrint>true</prettyPrint>
            </jsonFormatter>`enter code here`
        </layout>

【讨论】：

【解决方案2】：

如果您想保留关联 ID，您可以扩展 JSON 布局类并在地图上设置属性。

public class CustomJsonLayout extends JsonLayout {
@Override
protected Map toJsonMap(ILoggingEvent iLoggingEvent) {
    LinkedHashMap var2 = new LinkedHashMap();
    this.addTimestamp("timestamp", this.includeTimestamp, iLoggingEvent.getTimeStamp(), var2);
    this.add("level", this.includeLevel, String.valueOf(iLoggingEvent.getLevel()), var2);
    this.add("thread", this.includeThreadName, iLoggingEvent.getThreadName(), var2);
    this.add("logger", this.includeLoggerName, iLoggingEvent.getLoggerName(), var2);
    this.add("message", this.includeFormattedMessage, iLoggingEvent.getFormattedMessage(), var2);
    this.add("raw-message", this.includeMessage, iLoggingEvent.getMessage(), var2);
    this.add("context", this.includeContextName, iLoggingEvent.getLoggerContextVO().getName(), var2);
    this.addThrowableInfo("exception", this.includeException, iLoggingEvent, var2);
    this.addCustomDataToJsonMap(var2, iLoggingEvent);
    Map<String,String> mdc = iLoggingEvent.getMDCPropertyMap();
    String correlationId = mdc.getOrDefault("Correlation-ID","");
    this.add("Correlation-ID", this.includeMDC, correlationId , var2);
    return var2;
}
}

并在布局中添加新类。

 <layout class="com.test.utils.CustomJsonLayout">

【讨论】：