LoggerContext loggerContext = (LoggerContext) LogManager.getContext(false);
LoggerConfig loggerConfig = loggerContext.getConfiguration().getLoggers().get("root");
loggerConfig.setLevel(level);

LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
Logger logger = loggerContext.getLogger("root");
((ch.qos.logback.classic.Logger) logger).setLevel(level);

Logger logger = Logger.getLogger("root");
logger.setLevel(level);

LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
File externalConfigFile = new File("logback.xml");
JoranConfigurator configurator = new JoranConfigurator();
configurator.setContext(lc);
lc.reset();      
configurator.doConfigure(externalConfigFileLocation);

@RequestMapping(value = "logLevel/{logLevel}")
public String changeLogLevel(@PathVariable("logLevel") String logLevel) {
  try {
    LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
    Logger logger = loggerContext.getLogger("root");
    ((ch.qos.logback.classic.Logger) logger).setLevel(Level.valueOf(logLevel));
  } catch (Exception e) {
    logger.error("changeLogLevel error", e);
    return "fail";
  }
  return "success";
}

private void watcherPath(String path) {
  PathChildrenCache cache = new PathChildrenCache(client, path, true);
  cache.start(StartMode.POST_INITIALIZED_EVENT);
  cache.getListenable().addListener(new PathChildrenCacheListener() {
    @Override
    public void childEvent(CuratorFramework client, PathChildrenCacheEvent event) throws Exception {
      switch (event.getType()) {
      case CHILD_ADDED:
        break;
      case CHILD_UPDATED:
        String logLevel = new String(event.getData().getData());
         //日志級別更新處理
        break;
      case CHILD_REMOVED:
        break;
      default:
        break;
      }
    }
  });
}

//日志等級Topic
private final String TOPIC = "LOGLEVEL";
 
private void watcherPaths() throws JMSException {
  Topic topic = session.createTopic(TOPIC);
  MessageConsumer consumer = session.createConsumer(topic);
  consumer.setMessageListener(new MessageListener() {
    @Override
    public void onMessage(Message message) {
      TextMessage tm = (TextMessage) message;
      String logLevel = tm.getText();
      //日志級別更新處理
    }
  });
}

private void watcherPaths() throws JMSException {
  jedis.subscribe(new JedisPubSub() {
    @Override
    public void onMessage(String channel, String message) {
       String logLevel = message;
       //日志級別更新處理
    }
  },"LOGLEVEL");
}

<dependency>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>

management.endpoints.web.exposure.include=loggers

{
levels: [
  "OFF","ERROR","WARN","INFO","DEBUG","TRACE"
],
loggers: {
  ROOT: {
   configuredLevel: "INFO",
   effectiveLevel: "INFO"
  },
...
}

@Endpoint(id = "loggers")
public class LoggersEndpoint {
  private final LoggingSystem loggingSystem;
  @WriteOperation
  public void configureLogLevel(@Selector String name, @Nullable LogLevel configuredLevel) {
    Assert.notNull(name, "Name must not be empty");
    this.loggingSystem.setLogLevel(name, configuredLevel);
  }
  ...
}