logback - 如何以编程方式访问 logback-access 配置的附加程序？

Question

我已经使用 LogbackValve 为 Tomcat 7.0 启用了 logback-access 日志。我的 logback-access 配置如下所示。

<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>

现在一切正常，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 logback-access.xml 中配置的附加程序。有没有办法做到。由于没有定义 Logger，因此您不能使用 LoggerContext。

Answer 1

您可以使用 LogbackAccessContext 检索 logback-access.xml 中配置的附加程序。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());
}