如何以编程方式从logback-access配置访问appender？

Question

我使用LogbackValve为Tomcat 7.0启用了logback-access日志。我的logback-access配置看起来像这样。

<configuration>  
    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>access.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
      <fileNamePattern>access.%d{yyyy-MM-dd}.log.zip</fileNamePattern>
    </rollingPolicy>

    <encoder>
      <pattern>combined</pattern>
    </encoder>
  </appender>

  <appender-ref ref="FILE" />
</configuration>

现在这很完美，我可以看到访问日志。但在其他一些代码中，我想以编程方式检索在logback-access.xml中配置的appender。有没有办法做到这一点。由于没有定义Logger，因此无法使用LoggerContext。

Answer 1

您可以使用LogbackAccessContext检索logback-access.xml中配置的appender。这是我的解决方案：

TomcatServletWebServerFactory sc = (TomcatServletWebServerFactory) context.getBean(TomcatServletWebServerFactory.class);
List<Valve> values = (List<Valve>) sc.getEngineValves();
LogbackAccessTomcatValve accessTomcatValve = null;
for(Valve value : values) {
    if(value.getClass() == LogbackAccessTomcatValve.class) {
        accessTomcatValve = (LogbackAccessTomcatValve) value;
    }
}

//get logbackAccessContext from the logbackAccessTomcatValve by invoking.
LogbackAccessContext logbackAccessContext = null;
Field field = null;
try {
    field = accessTomcatValve.getClass().getDeclaredField("logbackAccessContext");
    field.setAccessible(true);
    logbackAccessContext = (LogbackAccessContext) field.get(accessTomcatValve);
} catch (Exception e) {
    log.error("Exception happened when fetching the logback access context ." +e.getMessage());
}