byte[] 轉 2進制，16進制

1.byte[]轉2進制

private static String[] binaryArray =
            {"0000","0001","0010","0011",
                    "0100","0101","0110","0111",
                    "1000","1001","1010","1011",
                    "1100","1101","1110","1111"};
    /**
     *
     * @param bArray
     * @return 轉換爲二進制字符串
     */
    public static String bytes2BinaryStr(byte[] bArray){

        String outStr = "";
        int pos = 0;
        for(byte b:bArray){
            //高四位
            pos = (b&0xF0)>>4;
            outStr+=binaryArray[pos];
            //低四位
            pos=b&0x0F;
            outStr+=binaryArray[pos];
        }
        return outStr;

    }

2.byte[]轉16進制

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);
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv);
        }
        return stringBuilder.toString();
    }

3.16進制轉byte[]

//將16進制的字符串轉成字符數組
  public static byte[] getHexBytes(String str){
        str =   str.replaceAll(" ", "");
    byte[] bytes = new byte[str.length() / 2];
    for(int i = 0; i < str.length() / 2; i++) {
      String subStr = str.substring(i * 2, i * 2 + 2);
      bytes[i] = (byte) Integer.parseInt(subStr, 16);
    }
    return bytes;
  }