Hex encodes a byte array. - Java java.lang

Java examples for java.lang:String Hex

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Description

Hex encodes a byte array.

Demo Code

//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        byte[] input = new byte[] { 34, 35, 36, 37, 37, 37, 67, 68, 69 };
        System.out.println(hexEncode(input));
    }/*from   ww  w .  j  av a  2  s.c o  m*/

    /**
     * Hex encodes a byte array. <BR>
     * Returns an empty string if the input array is null or empty. <p>
     * From http://www.scottjjohnson.com/blog/AesWithCbcExample.java
     * 
     * @param input bytes to encode
     * @return string containing hex representation of input byte array
     */
    public static String hexEncode(byte[] input) {
        if (input == null || input.length == 0) {
            return "";
        }

        int inputLength = input.length;
        StringBuilder output = new StringBuilder(inputLength * 2);

        for (int i = 0; i < inputLength; i++) {
            int next = input[i] & 0xff;
            if (next < 0x10) {
                output.append("0");
            }

            output.append("0x");
            output.append(Integer.toHexString(next));
            if (i != inputLength - 1) {
                output.append(", ");
            }
        }

        return output.toString();
    }
}

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