【Java】将字节转换成十六进制、BCD码输出

 public class HexUtils {  

     public static void main(String[] args) {
         byte []out = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
                 (byte)0x10, (byte)0x11, (byte)0x12, (byte)127, (byte)128, (byte)255 };

         System.out.println( bytesToHexString((byte)10));
         System.out.println( bytesToHexString(out) );
         System.out.println( bytesToHexString(out, 0) );
         System.out.println( bytesToHexString(out, 1) );

         byte []b1 = hexStringToBytes("0123456789ABCDEF");
         for( int i = 0; i < b1.length; i++ ) {
             System.out.println("[" + i + "]:" + b1[i]);
         }
         System.out.println( bytesToHexString(b1) );

         byte []b2 = bcdStringToBytes("1234567890123456");
         for( int i = 0; i < b2.length; i++ ) {
             System.out.println("[" + i + "]:" + b2[i]);
         }
         System.out.println( bytesToHexString(b2) );

         byte []bcdBytes = {0, 1, 2, 3, 4, 5, 6, 7, 9, 111,
                 10, 11, 21, 31, 41, 51, 61, 71, 81, 91, 99};
         System.out.println( bcdToHexString(bcdBytes) );
     }  

     public static String bytesToHexString(byte src) {
         int v = src & 0xFF;
         String hv = Integer.toHexString(v);
         return hv;
     }  

     public static String bytesToHexString(byte[] src) {
         StringBuilder stringBuilder = new StringBuilder("");
         if (src == null || src.length <= 0) {
             return null;
         }
         for (int i = 0; i < src.length; i++) {
             int v = src[i] & 0xFF;
             String hv = Integer.toHexString(v);
             hv = hv.toUpperCase();
             if (hv.length() < 2) {
                 stringBuilder.append(0);
             }
             stringBuilder.append(hv);
         }
         return stringBuilder.toString();
     }  

     public static String bytesToHexString(byte[] src, int mode) {
         StringBuilder stringBuilder = new StringBuilder("");
         if (src == null || src.length <= 0) {
             return null;
         }
         for (int i = 0; i < src.length; i++) {  

             if( i != 0 && i % 16 == 0 ) {
                 stringBuilder.append("\r\n");
             }

             if( mode == 1 ) {
                 stringBuilder.append("0x");
             }

             int v = src[i] & 0xFF;
             String hv = Integer.toHexString(v);
             if (hv.length() < 2) {
                 stringBuilder.append(0);
             }
             stringBuilder.append(hv);

             if( mode == 1 && i+1 != src.length ) {
                 stringBuilder.append(',');
             }
             stringBuilder.append(" ");
         }
         return stringBuilder.toString();
     }

     public static String bcdToHexString(byte[] src) {
         StringBuilder stringBuilder = new StringBuilder("");
         if (src == null || src.length <= 0) {
             return null;
         }
         for (int i = 0; i < src.length; i++) {
             int v = src[i] & 0xFF;
             int v1 = v / 10;
             int v2 = v % 10;

             if( v >= 0 && v < 100 ) {
                 stringBuilder.append( v1 );
                 stringBuilder.append( v2 );
             }
         }
         return stringBuilder.toString();
     }  

     public static byte[] hexStringToBytes(String hexString) {
         if (hexString == null || hexString.equals("") || hexString.length() % 2 != 0) {
             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;
     }  

     public static byte[] bcdStringToBytes(String hexString) {
         if (hexString == null || hexString.equals("") || hexString.length() % 2 != 0) {
             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]) * 10 + charToByte(hexChars[pos + 1]));
         }
         return d;
     } 

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