字符串与字节转换函数

最新推荐文章于 2020-12-30 06:30:52 发布

liuwinner

最新推荐文章于 2020-12-30 06:30:52 发布

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public class NumberChange {
   /*
   * 把16进制字符串转换成字节数组 @param hex @return
   */
   public static byte[] hexStringToByte(String hex) {
       int len = (hex.length() / 2);
       byte[] result = new byte[len];
       char[] achar = hex.toCharArray();
       for (int i = 0; i < len; i++) {
           int pos = i * 2;
           result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));
       }
       return result;
   }

   private static byte toByte(char c) {
       byte b = (byte) "0123456789ABCDEF".indexOf(c);
       return b;
   }

   /**
   * 把字节数组转换成16进制字符串
   *
   * @param bArray
   * @return
   */
   public static final String bytesToHexString(byte[] bArray) {
       StringBuffer sb = new StringBuffer(bArray.length);
       String sTemp;
       for (int i = 0; i < bArray.length; i++) {
           sTemp = Integer.toHexString(0xFF & bArray[i]);
           if (sTemp.length() < 2)
               sb.append(0);
           sb.append(sTemp.toUpperCase());
       }
       return sb.toString();
   }

   /**
   * @函数功能: BCD码转为10进制串(阿拉伯数据)
   * @输入参数: BCD码
   * @输出结果: 10进制串
   */
   public static String bcd2Str(byte[] bytes) {
       StringBuffer temp = new StringBuffer(bytes.length * 2);

       for (int i = 0; i < bytes.length; i++) {
           temp.append((byte) ((bytes[i] & 0xf0) >>> 4));
           temp.append((byte) (bytes[i] & 0x0f));
       }
       return temp.toString().substring(0, 1).equalsIgnoreCase("0") ? temp.toString().substring(1) : temp.toString();
   }
   /**
   * @函数功能: 10进制串转为BCD码
   * @输入参数: 10进制串
   * @输出结果: BCD码
   */
   public static byte[] str2Bcd(String asc) {
       int len = asc.length();
       int mod = len % 2;

       if (mod != 0) {
           asc = "0" + asc;
           len = asc.length();
       }

       byte abt[] = new byte[len];
       if (len >= 2) {
           len = len / 2;
       }

       byte bbt[] = new byte[len];
       abt = asc.getBytes();
       int j, k;

       for (int p = 0; p < asc.length() / 2; p++) {
           if ((abt[2 * p] >= '0') && (abt[2 * p] <= '9')) {
               j = abt[2 * p] - '0';
           } else if ((abt[2 * p] >= 'a') && (abt[2 * p] <= 'z')) {
               j = abt[2 * p] - 'a' + 0x0a;
           } else {
               j = abt[2 * p] - 'A' + 0x0a;
           }

           if ((abt[2 * p + 1] >= '0') && (abt[2 * p + 1] <= '9')) {
               k = abt[2 * p + 1] - '0';
           } else if ((abt[2 * p + 1] >= 'a') && (abt[2 * p + 1] <= 'z')) {
               k = abt[2 * p + 1] - 'a' + 0x0a;
           } else {
               k = abt[2 * p + 1] - 'A' + 0x0a;
           }

           int a = (j << 4) + k;
           byte b = (byte) a;
           bbt[p] = b;
       }
       return bbt;
   }

   public static void main(String[] arg) {
       /**
       * 68 65 6C 6C 6 F 0A
       * C4 E3 BA C3
       */
       String[] str = {"C4", "E3", "BA", "C3"};
//       String[] str = {"7E","02","04","00","07","10","00","00","00","00","13","08","4F","01","0B","0B","15","10","14","13","44","7E"};
       byte[] b = new byte[str.length];
       for(int i=0;i<str.length;i++){
           b[i] = hexStringToByte(str[i])[0];
       }
       System.out.println(new String(b));


       String strC   ="你好";
       String bth=bytesToHexString(strC.getBytes());
      System.out.println(bth);
       System.out.println(Short.MAX_VALUE);
       System.out.println(Integer.toBinaryString(280));
   }
}