16進文字列をintに変換する

private static int HexToInt(String hexStr) {
  char s[];
  int i, wt, value;
  wt = 1;
  value = 0;
  s = hexStr.toCharArray();
  for (i = hexStr.length() - 1; i > -1; i--) {
    switch (s[i]) {
    case '0':
      value += wt * 0;
      break;
    case '1':
      value += wt * 1;
      break;
    case '2':
      value += wt * 2;
      break;
    case '3':
      value += wt * 3;
      break;
    case '4':
      value += wt * 4;
      break;
    case '5':
      value += wt * 5;
      break;
    case '6':
      value += wt * 6;
      break;
    case '7':
      value += wt * 7;
      break;
    case '8':
      value += wt * 8;
      break;
    case '9':
      value += wt * 9;
      break;
    case 'A':
      value += wt * 10;
      break;
    case 'B':
      value += wt * 11;
      break;
    case 'C':
      value += wt * 12;
      break;
    case 'D':
      value += wt * 13;
      break;
    case 'E':
      value += wt * 14;
      break;
    case 'F':
      value += wt * 15;
      break;
    }
    wt *= 16;
  }
  return value;
}

intから16進2桁に変換する

private static String IntToHex(int value) {
  char HEX[] = { Character.forDigit((value >> 4) & 0x0F, 16),
      Character.forDigit(value & 0x0F, 16) };
  String HexStr = new String(HEX);
  return HexStr.toUpperCase();
}

部分文字列を取り出す

private String getCutString(String str, String start, String end) throws Exception {
  String rtnStr = "";

  int pos1, pos2;
  pos1 = str.indexOf(start);
  if (!end.equals("")) {
    pos2 = str.indexOf(end, pos1);
    rtnStr = str.substring(pos1 + start.length(), pos2);
  } else {
    rtnStr = str.substring(pos1 + start.length());
  }

  return rtnStr;
}

javacコマンド

javac -encoding MS932 -cp .:$CLASSPATH packagename/*.java

native2ascii

native2ascii 
  [ -encoding エンコード方式 ] 
  [ -reverse ] 
  変換前ファイル 
  変換後ファイル

native2ascii 
  -encoding euc-jp 
  packagename/hoge.properties.euc
  packagename/hoge.properties