Logger.java 文件源码

/**
 * Helper that configures java.util.logging to sanely log messages at FINE level without additional
 * formatting.
 */
public JavaLogger appendToFile(String logfile) {
  logger.setLevel(java.util.logging.Level.FINE);
  try {
    FileHandler handler = new FileHandler(logfile, true);
    handler.setFormatter(new SimpleFormatter() {
      @Override
      public String format(LogRecord record) {
        return String.format("%s%n", record.getMessage()); // NOPMD
      }
    });
    logger.addHandler(handler);
  } catch (IOException e) {
    throw new IllegalStateException("Could not add file handler.", e);
  }
  return this;
}