【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("
");
            }
        
            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);  
    }  
}