short、int、long与byte之间的转换工具类

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/**  * 各基础类型与byte之间的转换  * @author shanl  *  */  public class Utility {      /**      * 将short转成byte[2]      * @param a      * @return      */      public static byte[] short2Byte(short a){          byte[] b = new byte[2];          b[0] = (byte) (a >> 8);          b[1] = (byte) (a);          return b;      }      /**      * 将short转成byte[2]      * @param a      * @param b      * @param offset b中的偏移量      */      public static void short2Byte(short a, byte[] b, int offset){          b[offset] = (byte) (a >> 8);          b[offset+1] = (byte) (a);      }      /**      * 将byte[2]转换成short      * @param b      * @return      */      public static short byte2Short(byte[] b){          return (short) (((b[0] & 0xff) << 8) | (b[1] & 0xff));      }      /**      * 将byte[2]转换成short      * @param b      * @param offset      * @return       */      public static short byte2Short(byte[] b, int offset){          return (short) (((b[offset] & 0xff) << 8) | (b[offset+1] & 0xff));      }      /**      * long转byte[8]      *       * @param a      * @param b      * @param offset      *            b的偏移量      */      public static void long2Byte(long a, byte[] b, int offset) {                  b[offset + 0] = (byte) (a >> 56);          b[offset + 1] = (byte) (a >> 48);          b[offset + 2] = (byte) (a >> 40);          b[offset + 3] = (byte) (a >> 32);          b[offset + 4] = (byte) (a >> 24);          b[offset + 5] = (byte) (a >> 16);          b[offset + 6] = (byte) (a >> 8);          b[offset + 7] = (byte) (a);      }      /**      * byte[8]转long      *       * @param b      * @param offset      *            b的偏移量      * @return      */      public static long byte2Long(byte[] b, int offset) {           return ((((long) b[offset + 0] & 0xff) << 56)           | (((long) b[offset + 1] & 0xff) << 48)           | (((long) b[offset + 2] & 0xff) << 40)           | (((long) b[offset + 3] & 0xff) << 32)           | (((long) b[offset + 4] & 0xff) << 24)           | (((long) b[offset + 5] & 0xff) << 16)           | (((long) b[offset + 6] & 0xff) << 8)           | (((long) b[offset + 7] & 0xff) << 0));      }      /**      * byte[8]转long      *       * @param b      * @return      */      public static long byte2Long(byte[] b) {           return           ((b[0]&0xff)<<56)|           ((b[1]&0xff)<<48)|           ((b[2]&0xff)<<40)|           ((b[3]&0xff)<<32)|           ((b[4]&0xff)<<24)|           ((b[5]&0xff)<<16)|           ((b[6]&0xff)<<8)|           (b[7]&0xff);      }      /**      * long转byte[8]      *       * @param a      * @return      */      public static byte[] long2Byte(long a) {          byte[] b = new byte[4 * 2];          b[0] = (byte) (a >> 56);          b[1] = (byte) (a >> 48);          b[2] = (byte) (a >> 40);          b[3] = (byte) (a >> 32);          b[4] = (byte) (a >> 24);          b[5] = (byte) (a >> 16);          b[6] = (byte) (a >> 8);          b[7] = (byte) (a >> 0);          return b;      }      /**      * byte数组转int      *       * @param b      * @return      */      public static int byte2Int(byte[] b) {          return ((b[0] & 0xff) << 24) | ((b[1] & 0xff) << 16)                  | ((b[2] & 0xff) << 8) | (b[3] & 0xff);      }      /**      * byte数组转int      *       * @param b      * @param offset      * @return      */      public static int byte2Int(byte[] b, int offset) {          return ((b[offset++] & 0xff) << 24) | ((b[offset++] & 0xff) << 16)                  | ((b[offset++] & 0xff) << 8) | (b[offset++] & 0xff);      }      /**      * int转byte数组      *       * @param a      * @return      */      public static byte[] int2Byte(int a) {          byte[] b = new byte[4];          b[0] = (byte) (a >> 24);          b[1] = (byte) (a >> 16);          b[2] = (byte) (a >> 8);          b[3] = (byte) (a);          return b;      }      /**      * int转byte数组      *       * @param a      * @param b      * @param offset      * @return      */      public static void int2Byte(int a, byte[] b, int offset) {                b[offset++] = (byte) (a >> 24);          b[offset++] = (byte) (a >> 16);          b[offset++] = (byte) (a >> 8);          b[offset++] = (byte) (a);      }  }
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