字符串，int，十六进制间转换

      public class TypeConvert
       {
.    /* 字符串转byte[]
03.        这个方法转换后的结果是会多一些 48字符进来的就是代表的是0不知道为什么，但是可以只是取出指定的字符串就行了
04.    */
.  public static byte[] hexStringToBytes(String hexString) 
     {  
       if (hexString == null || hexString.equals(""))
        {         
                 return null;  

}

hexString = hexString.toUpperCase();

int length = hexString.length() / 2;

char[] hexChars = hexString.toCharArray();

byte[] d = new byte[length];

for (int i = 0; i < length; i++) {

int pos = i * 2;

d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));

}

return d;

}

.
.    /* byte转short */
.    public final static short getShort(byte[] buf, boolean asc, int len) {
.        short r = ;
.        if (asc)
.          for (int i = len - ; i >= ; i--) {
.            r <<= ;
.            r |= (buf[i] & 0x00ff);
.          }
.        else
.          for (int i = ; i < len; i++) {
.            r <<= ;
.            r |= (buf[i] & 0x00ff);
.          }
.
.        return r;
.    }
.
.    /* B2 -> 0xB2 */
.    public static int stringToByte(String in, byte[] b) throws Exception {
.        if (b.length < in.length() / ) {
.            throw new Exception("byte array too small");
.        }
.
.        int j=;
.        StringBuffer buf = new StringBuffer();
.        for (int i=; i<in.length(); i++, j++) {
.            buf.insert(, in.charAt(i));
.            buf.insert(, in.charAt(i+));
.            int t = Integer.parseInt(buf.toString(),);
.            System.out.println("byte hex value:" + t);
.            b[j] = (byte)t;
.            i++;
.            buf.delete(,);
.        }
.
.        return j;
.    }
.
.    /* byte to  int */
.    public final static int getInt(byte[] buf, boolean asc, int len) {
.        if (buf == null) {
.          throw new IllegalArgumentException("byte array is null!");
.        }
.        if (len > ) {
.          throw new IllegalArgumentException("byte array size > 4 !");
.        }
.        int r = ;
.        if (asc)
.          for (int i = len - ; i >= ; i--) {
.            r <<= ;
.            r |= (buf[i] & 0x000000ff);
.          }
.        else
.          for (int i = ; i < len; i++) {
.            r <<= ;
.            r |= (buf[i] & 0x000000ff);
.          }
.        return r;
.    }
.
.    /* int -> byte[] */
.    public static byte[] intToBytes(int num) {
.       byte[] b = new byte[];
.       for (int i = ; i < ; i++) {
.        b[i] = (byte) (num >>> ( - i * ));
.       }
.
.       return b;
.    }
.
.    /* short to byte[] */
.    public static byte[] shortToBytes(short num) {
.       byte[] b = new byte[];
.
.       for (int i = ; i < ; i++) {
.           b[i] = (byte) (num >>> (i * ));
.       }
.
.       return b;
.    }
.
.    /* byte to String */
.    private static char findHex(byte b) {
.        int t = new Byte(b).intValue();
.        t = t <  ? t +  : t;
.
.        if (( <= t) &&(t <= )) {
.        return (char)(t + '');
.        }
.
.        return (char)(t-+'A');
.    }
.    public static String byteToString(byte b) {
.        byte high, low;
.        byte maskHigh = (byte)0xf0;
.        byte maskLow = 0x0f;
.
.        high = (byte)((b & maskHigh) >> );
.        low = (byte)(b & maskLow);
.
.        StringBuffer buf = new StringBuffer();
.        buf.append(findHex(high));
.        buf.append(findHex(low));
.
.        return buf.toString();
.    }
.
.    /* short -> byte */
.    public final static byte[] getBytes(short s, boolean asc) {
.        byte[] buf = new byte[];
.        if (asc)      for (int i = buf.length - ; i >= ; i--) {        buf[i] = (byte) (s & 0x00ff);
.            s >>= ;
.          }
.        else
.          for (int i = ; i < buf.length; i++) {
.            buf[i] = (byte) (s & 0x00ff);
.            s >>= ;
.          }
.        return buf;
.      }
.    /* int -> byte[] */
.      public final static byte[] getBytes(int s, boolean asc) {
.        byte[] buf = new byte[];
.        if (asc)
.          for (int i = buf.length - ; i >= ; i--) {
.            buf[i] = (byte) (s & 0x000000ff);
.            s >>= ;
.          }
.        else
.          for (int i = ; i < buf.length; i++) {
.            buf[i] = (byte) (s & 0x000000ff);
.            s >>= ;
.          }
.        return buf;
.      }
.
.      /* long -> byte[] */
.      public final static byte[] getBytes(long s, boolean asc) {
.        byte[] buf = new byte[];
.        if (asc)
.          for (int i = buf.length - ; i >= ; i--) {
.            buf[i] = (byte) (s & 0x00000000000000ff);
.            s >>= ;
.          }
.        else
.          for (int i = ; i < buf.length; i++) {
.            buf[i] = (byte) (s & 0x00000000000000ff);
.            s >>= ;
.          }
.        return buf;
.      }
.
.      /* byte[]->int */
.      public final static int getInt(byte[] buf, boolean asc) {
.        if (buf == null) {
.          throw new IllegalArgumentException("byte array is null!");
.        }
.        if (buf.length > ) {
.          throw new IllegalArgumentException("byte array size > 4 !");
.        }
.        int r = ;
.        if (asc)
.          for (int i = buf.length - ; i >= ; i--) {
.            r <<= ;
.            r |= (buf[i] & 0x000000ff);
.          }
.        else
.          for (int i = ; i < buf.length; i++) {
.            r <<= ;
.            r |= (buf[i] & 0x000000ff);
.          }
.        return r;
.      }
.      /* byte[] -> long */
.      public final static long getLong(byte[] buf, boolean asc) {
.        if (buf == null) {
.          throw new IllegalArgumentException("byte array is null!");
.        }
.        if (buf.length > ) {
.          throw new IllegalArgumentException("byte array size > 8 !");
.        }
.        long r = ;
.        if (asc)
.          for (int i = buf.length - ; i >= ; i--) {
.            r <<= ;
.            r |= (buf[i] & 0x00000000000000ff);
.          }
.        else
.          for (int i = ; i < buf.length; i++) {
.            r <<= ;
.            r |= (buf[i] & 0x00000000000000ff);
.          }
.        return r;
.      }
.}