Log4JMetricsFileWriter.java 文件源码

private RollingFileAppender initLogger(String loggerName, String filePrefix) {
  String fileName = Paths.get(rootPath, filePrefix + "." + loggerName + ".dat").toString();
  RollingFileAppender fileAppender = new RollingFileAppender();
  fileAppender.setName(loggerName);
  fileAppender.setFile(fileName);
  fileAppender.setLayout(new PatternLayout("%m%n"));
  fileAppender.setAppend(true);
  fileAppender.setMaxFileSize(maxFileSize);
  fileAppender.setMaxBackupIndex(maxFileCount);
  fileAppender.activateOptions();
  return fileAppender;
}