数值转换

public class Tool{

   private static String HexCode[] = {
       "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
       "a", "b", "c", "d", "e", "f"
   };

   private Tool(){
   }

   public static String byteToHexString(byte b){
       int n = b;
       if(n < 0)
           n = 256 + n;
       int d1 = n / 16;
       int d2 = n % 16;
       return HexCode[d1]+HexCode[d2];
   }

   public static String byteArrayToHexString(byte b[]){
       String result = "";
       for(int i = 0; i < b.length; i++)
           result = result+byteToHexString(b[i]);
       return result;
   }

   public static int byte2int(byte b[], int offset)
   {
       return b[offset + 3] & 0xff | (b[offset + 2] & 0xff) << 8 | (b[offset + 1] & 0xff) << 16 | (b[offset] & 0xff) << 24;
   }

   public static int byte2int(byte b[])
   {
       return b[3] & 0xff | (b[2] & 0xff) << 8 | (b[1] & 0xff) << 16 | (b[0] & 0xff) << 24;
   }

   public static long byte2long(byte b[])
   {
       return (long)b[7] & (long)255 | ((long)b[6] & (long)255) << 8 | ((long)b[5] & (long)255) << 16 | ((long)b[4] & (long)255) << 24 | ((long)b[3] & (long)255) << 32 | ((long)b[2] & (long)255) << 40 | ((long)b[1] & (long)255) << 48 | (long)b[0] << 56;
   }

   public static long byte2long(byte b[], int offset)
   {
       return (long)b[offset + 7] & (long)255 | ((long)b[offset + 6] & (long)255) << 8 | ((long)b[offset + 5] & (long)255) << 16 | ((long)b[offset + 4] & (long)255) << 24 | ((long)b[offset + 3] & (long)255) << 32 | ((long)b[offset + 2] & (long)255) << 40 | ((long)b[offset + 1] & (long)255) << 48 | (long)b[offset] << 56;
   }

   public static byte[] int2byte(int n)
   {
       byte b[] = new byte[4];
       b[0] = (byte)(n >> 24);
       b[1] = (byte)(n >> 16);
       b[2] = (byte)(n >> 8);
       b[3] = (byte)n;
       return b;
   }

   public static void int2byte(int n, byte buf[], int offset)
   {
       buf[offset] = (byte)(n >> 24);
       buf[offset + 1] = (byte)(n >> 16);
       buf[offset + 2] = (byte)(n >> 8);
       buf[offset + 3] = (byte)n;
   }

   public static byte[] short2byte(int n)
   {
       byte b[] = new byte[2];
       b[0] = (byte)(n >> 8);
       b[1] = (byte)n;
       return b;
   }

   public static void short2byte(int n, byte buf[], int offset)
   {
       buf[offset] = (byte)(n >> 8);
       buf[offset + 1] = (byte)n;
   }

   public static byte[] long2byte(long n)
   {
       byte b[] = new byte[8];
       b[0] = (byte)(int)(n >> 56);
       b[1] = (byte)(int)(n >> 48);
       b[2] = (byte)(int)(n >> 40);
       b[3] = (byte)(int)(n >> 32);
       b[4] = (byte)(int)(n >> 24);
       b[5] = (byte)(int)(n >> 16);
       b[6] = (byte)(int)(n >> 8);
       b[7] = (byte)(int)n;
       return b;
   }

   public static void long2byte(long n, byte buf[], int offset)
   {
       buf[offset] = (byte)(int)(n >> 56);
       buf[offset + 1] = (byte)(int)(n >> 48);
       buf[offset + 2] = (byte)(int)(n >> 40);
       buf[offset + 3] = (byte)(int)(n >> 32);
       buf[offset + 4] = (byte)(int)(n >> 24);
       buf[offset + 5] = (byte)(int)(n >> 16);
       buf[offset + 6] = (byte)(int)(n >> 8);
       buf[offset + 7] = (byte)(int)n;
   }

   public static boolean checkMobile(String sMobile){
       String sF6 = "",sB7= "",sF2="";
       if(sMobile == null)
           return false;
       if(sMobile.length()!= 11)
           return false;
       sF6 = sMobile.substring(0,7);
       sF2 = sMobile.substring(0,2);
       sB7 = sMobile.substring(7);
       try {
           int iT = Integer.valueOf(sF6).intValue() ;
           iT = Integer.valueOf(sB7).intValue();
           if(sF2.equals("13"))
               return true;
           else
               return false;
       }
       catch (Exception ex) {
           return false;
       }
   }

   public static byte[] getBytesRingORPic(String ringOrMap){
      int length = ringOrMap.length()/2;
      byte[] bMsg = new byte[length];
      for(int i=0;i<length;i++){
          byte x = Byte.parseByte(ringOrMap.substring(2*i,2*i+1),16);
          byte y = Byte.parseByte(ringOrMap.substring(2*i+1,2*i+2),16);
          int j = x*16+y;
          bMsg[i]=(byte)j;
      }
      return bMsg;
  }


}