如何将日志配置文件放入到Apollo配置中心并支持热更新

• 增加监听日志文件（LoggerConfiguration.java）

@Service
public class LoggerConfiguration {
  private static final Logger logger = LoggerFactory.getLogger(LoggerConfiguration.class);
  private static final String LOGGER_TAG = "logging.level.";
  
  @Autowired
  private LoggingSystem loggingSystem;
 
  @ApolloConfig
  private Config config;
 
  @ApolloConfigChangeListener
  private void configChangeListter(ConfigChangeEvent changeEvent) {
    refreshLoggingLevels();
  }
 
  @PostConstruct
  private void refreshLoggingLevels() {
    Set<String> keyNames = config.getPropertyNames();
    for (String key : keyNames) {
      if (containsIgnoreCase(key, LOGGER_TAG)) {
        String strLevel = config.getProperty(key, "info");
        LogLevel level = LogLevel.valueOf(strLevel.toUpperCase());
        loggingSystem.setLogLevel(key.replace(LOGGER_TAG, ""), level);
        logger.info("{}:{}", key, strLevel);
      }
    }
  }
 
  private static boolean containsIgnoreCase(String str, String searchStr) {
    if (str == null || searchStr == null) {
      return false;
    }
    int len = searchStr.length();
    int max = str.length() - len;
    for (int i = 0; i <= max; i++) {
      if (str.regionMatches(true, i, searchStr, 0, len)) {
        return true;
      }
    }
    return false;
  }
}

• 在apollo配置日志等级(loggers.root.level)

• 修改日志级别后实现不重启程序热更新