public static String getUniStr(String str)
 {
  StringBuffer uniString = new StringBuffer();
  for (int i = 0; i < str.length(); i++)
  {
   Character ch = new Character(str.charAt(i));
   if (ch.toString().getBytes().length == 1)
   {
    uniString.append(ch.charValue());
   }
   else
   { // double bytes character: Chinese
    int a = (int) ch.charValue();
    String tmp = new String("&#x" + Integer.toHexString(a) + ";");
    uniString.append(tmp);
   }
  }
  return uniString.toString();
 }

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