String hex encoding - Java java.lang

Java examples for java.lang:String Hex

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Description

String hex encoding

Demo Code


public class Hex {


    public static void main(String[] args) throws Exception {
        final String input = "01234567890abcdefghijklmnopqrstuvwxyz";
        String hex = encode(input.getBytes("UTF-8"));
        System.out.println("HEX format:" + hex);

        byte[] hexbytes = deocde(hex);
        System.out.println(new String(hexbytes, "UTF-8"));
    }// w  ww  .  j a  v a 2s.  c o  m

    public static byte[] deocde(String hexStr) {
        if (hexStr.length() < 1)
            return null;
        byte[] result = new byte[hexStr.length() / 2];
        for (int i = 0; i < hexStr.length() / 2; i++) {
            int high = Integer.parseInt(hexStr.substring(i * 2, i * 2 + 1),
                    16);
            int low = Integer.parseInt(
                    hexStr.substring(i * 2 + 1, i * 2 + 2), 16);
            result[i] = (byte) (high * 16 + low);
        }
        return result;
    }

    public static String encode(byte buf[]) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < buf.length; i++) {
            String hex = Integer.toHexString(buf[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            sb.append(hex.toUpperCase());
        }
        return sb.toString();
    }

}

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