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受这种Java 类方法的启发，我正在尝试一种基于 XML 的方法，用于直接通过logback-spring.xml. 这失败了，日志没有到达 ELK。可能是什么原因？任何帮助将不胜感激。

@Configuration 方法

    private void addLogstashAppender(LoggerContext context) {
    LogstashTcpSocketAppender logstashAppender = new LogstashTcpSocketAppender();
    logstashAppender.setName(LOGSTASH_APPENDER_NAME);
    logstashAppender.setContext(context);
    String customFields = "{\"app_name\":\"" + appName + "\",\"app_port\":\"" + serverPort + "\"}";
    LogstashEncoder logstashEncoder=new LogstashEncoder();
    // Set the Logstash appender config from JHipster properties
    logstashEncoder.setCustomFields(customFields);
    // Set the Logstash appender config from JHipster properties
    logstashAppender.addDestinations(new InetSocketAddress(jHipsterProperties.getLogging().getLogstash().getHost(),jHipsterProperties.getLogging().getLogstash().getPort()));

    ShortenedThrowableConverter throwableConverter = new ShortenedThrowableConverter();
    throwableConverter.setRootCauseFirst(true);
    logstashEncoder.setThrowableConverter(throwableConverter);
    logstashEncoder.setCustomFields(customFields);

    logstashAppender.setEncoder(logstashEncoder);
    logstashAppender.start();

    // Wrap the appender in an Async appender for performance
    AsyncAppender asyncLogstashAppender = new AsyncAppender();
    asyncLogstashAppender.setContext(context);
    asyncLogstashAppender.setName(ASYNC_LOGSTASH_APPENDER_NAME);
    asyncLogstashAppender.setQueueSize(jHipsterProperties.getLogging().getLogstash().getQueueSize());
    asyncLogstashAppender.addAppender(logstashAppender);
    asyncLogstashAppender.start();
    context.getLogger("ROOT").addAppender(asyncLogstashAppender);
}

logback-spring.xml 方法（不向 ELK 发送日志）

<appender name="LOGSTASH"
          class="net.logstash.logback.appender.LogstashTcpSocketAppender">
    <destination>${LOGSTASH_HOST}:${LOGSTASH_PORT}</destination>
    <encoder charset="UTF-8"
             class="net.logstash.logback.encoder.LogstashEncoder">
    </encoder>
</appender>   
<root level="info">
    <appender-ref ref="FILE-ROLLING"/>
    <appender-ref ref="LOGSTASH"/>
</root>
<shutdownHook class="ch.qos.logback.core.hook.DelayingShutdownHook"/>

删除后，我以调试模式运行应用程序，AsyncAppender日志如下。没有注意到任何不愉快的事情。

22:33:10,313 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [net.logstash.logback.appender.LogstashTcpSocketAppender]
22:33:10,379 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [LOGSTASH]
22:33:11,090 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [com.sampleapp] to INFO
22:33:11,093 |-INFO in ch.qos.logback.classic.jul.LevelChangePropagator@565f390 - Propagating INFO level on Logger[com.sampleapp] onto the JUL framework
22:33:11,101 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting additivity of logger [com.sampleapp] to false
22:33:11,102 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [FILE-ROLLING] to Logger[com.sampleapp]
22:33:11,105 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [org.hibernate] to INFO
22:33:11,105 |-INFO in ch.qos.logback.classic.jul.LevelChangePropagator@565f390 - Propagating INFO level on Logger[org.hibernate] onto the JUL framework
22:33:11,106 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting additivity of logger [org.hibernate] to false
22:33:11,106 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [FILE-ROLLING] to Logger[org.hibernate]
22:33:11,106 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [org.hibernate.SQL] to DEBUG
22:33:11,107 |-INFO in ch.qos.logback.classic.jul.LevelChangePropagator@565f390 - Propagating DEBUG level on Logger[org.hibernate.SQL] onto the JUL framework
22:33:11,108 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting additivity of logger [org.hibernate.SQL] to false
22:33:11,109 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [FILE-ROLLING] to Logger[org.hibernate.SQL]
22:33:11,111 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [org.hibernate.type.descriptor.sql] to DEBUG
22:33:11,112 |-INFO in ch.qos.logback.classic.jul.LevelChangePropagator@565f390 - Propagating DEBUG level on Logger[org.hibernate.type.descriptor.sql] onto the JUL framework
22:33:11,112 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting additivity of logger [org.hibernate.type.descriptor.sql] to false
22:33:11,113 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [FILE-ROLLING] to Logger[org.hibernate.type.descriptor.sql]
22:33:11,114 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [org.springframework] to INFO
22:33:11,114 |-INFO in ch.qos.logback.classic.jul.LevelChangePropagator@565f390 - Propagating INFO level on Logger[org.springframework] onto the JUL framework
22:33:11,114 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting additivity of logger [org.springframework] to false
22:33:11,114 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [FILE-ROLLING] to Logger[org.springframework]
22:33:11,115 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to INFO
22:33:11,116 |-INFO in ch.qos.logback.classic.jul.LevelChangePropagator@565f390 - Propagating INFO level on Logger[ROOT] onto the JUL framework
22:33:11,116 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [FILE-ROLLING] to Logger[ROOT]
22:33:11,116 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [LOGSTASH] to Logger[ROOT]
22:33:11,116 |-INFO in ch.qos.logback.core.joran.action.ShutdownHookAction - About to instantiate shutdown hook of type [ch.qos.logback.core.hook.DelayingShutdownHook]
22:33:11,122 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
22:33:11,123 |-INFO in org.springframework.boot.logging.logback.SpringBootJoranConfigurator@448c8166 - Registering current configuration as safe fallback point
22:33:11,179 |-INFO in net.logstash.logback.appender.LogstashTcpSocketAppender[LOGSTASH] - Log destination localhost:4560: connection established.
22:33:11,192 |-INFO in ch.qos.logback.classic.jul.LevelChangePropagator@565f390 - Propagating DEBUG level on Logger[com.sampleapp] onto the JUL framework
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