Java hexadecimal and string (Chinese and English) conversion

 /**
  * 字符串转换成为16进制(无需Unicode编码)
  * @param str
  * @return
  */
 public static String str2HexStr(String str) {
     char[] chars = "0123456789ABCDEF".toCharArray();
     StringBuilder sb = new StringBuilder("");
     byte[] bs = str.getBytes();
     int bit;
     for (int i = 0; i < bs.length; i++) {
         bit = (bs[i] & 0x0f0) >> 4;
         sb.append(chars[bit]);
         bit = bs[i] & 0x0f;
         sb.append(chars[bit]);
         // sb.append(' ');
     }
     return sb.toString().trim();
 }
 
 private static  String h exStr 2Str(String hexStr)
 {
  String str = "0123456789ABCDEF";
     char[] hexs = hexStr.toCharArray();
     byte[] bytes = new byte[hexStr.length() / 2];
     int n;
     for (int i = 0; i < bytes.length; i++) {
         n = str.indexOf(hexs[2 * i]) * 16;
         n += str.indexOf(hexs[2 * i + 1]);
         bytes[i] = (byte) (n & 0xff);
     }
     return new String(bytes);
 }