log4j中对于文件大小的限制

public
  static
  long toFileSize(String value, long dEfault) {
    if(value == null)
      return dEfault;

    String s = value.trim().toUpperCase();
    long multiplier = 1;
    int index;

    if((index = s.indexOf("KB")) != -1) {
      multiplier = 1024;
      s = s.substring(0, index);
    }
    else if((index = s.indexOf("MB")) != -1) {
      multiplier = 1024*1024;
      s = s.substring(0, index);
    }
    else if((index = s.indexOf("GB")) != -1) {
      multiplier = 1024*1024*1024;
      s = s.substring(0, index);
    }
    if(s != null) {
      try {
	return Long.valueOf(s).longValue() * multiplier;
      }
      catch (NumberFormatException e) {
	LogLog.error("[" + s + "] is not in proper int form.");
	LogLog.error("[" + value + "] not in expected format.", e);
      }
    }
    return dEfault;
  }