Hex 和string 互转工具类

package com.hisun.merchant.utils;


public class HexStringByte
{
  public static String stringToHex(String bin)
  {
    char[] digital = "0123456789ABCDEF".toCharArray();
    StringBuffer sb = new StringBuffer("");
    byte[] bs = bin.getBytes();


    for (int i = 0; i < bs.length; i++) {
      int bit = (bs[i] & 0xF0) >> 4;
      sb.append(digital[bit]);
      bit = bs[i] & 0xF;
      sb.append(digital[bit]);
    }
    return sb.toString();
  }


  public static String hexToString(String hex)
  {
    String digital = "0123456789ABCDEF";
    char[] hex2char = hex.toCharArray();
    byte[] bytes = new byte[hex.length() / 2];


    for (int i = 0; i < bytes.length; i++) {
      int temp = digital.indexOf(hex2char[(2 * i)]) * 16;
      temp += digital.indexOf(hex2char[(2 * i + 1)]);
      bytes[i] = (byte)(temp & 0xFF);
    }
    return new String(bytes);
  }


  public static String byteToHex(byte[] b)
  {
    String hs = "";
    String tmp = "";
    for (int n = 0; n < b.length; n++)
    {
      tmp = Integer.toHexString(b[n] & 0xFF);
      if (tmp.length() == 1)
        hs = hs + "0" + tmp;
      else {
        hs = hs + tmp;
      }
    }
    tmp = null;
    return hs.toUpperCase();
  }


  public static String byteToHex2(byte[] b)
  {
    String hs = "";
    String tmp = "";
    for (int n = 0; n < b.length; n++)
    {
      tmp = Integer.toHexString(b[n] & 0xFF);
      if (tmp.length() == 1)
        hs = hs + "0x0" + tmp;
      else {
        hs = hs + "0x" + tmp;
      }
    }
    tmp = null;
    return hs;
  }


  public static byte[] hexToByte(byte[] b)
  {
    if (b.length % 2 != 0) {
      throw new IllegalArgumentException("���볤�Ȳ���ż��");
    }
    byte[] b2 = new byte[b.length / 2];
    for (int n = 0; n < b.length; n += 2) {
      String item = new String(b, n, 2);


      b2[(n / 2)] = (byte)Integer.parseInt(item, 16);
    }
    b = (byte[])null;
    return b2;
  }
}