java 16进制数据格式化处理工具类,16进制byte数组转String

废话不多说，直接上代码。转换16进制字节数组，做数据处理时用得着，收藏吧！

/** * Created by xiaoming on 2017-10-13 15:02. * * @mail [e-mail] * @desc 16进制数据处理工具类 */public class HexDump {    private final static char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};//十六进制的组成元素    /**     * 字节数组以String形式输出 以空格分隔,如：FE 00 12 0F 0E     *     * @param array 字节数组     * @return     */    public static String dumpHexString(byte[] array) {        return dumpHexString(array, 0, array.length);    }    /**     * 字节数组以String形式输出 字节间以空格分隔     *     * @param array  字节数组     * @param offset 起始位置     * @param length 长度     * @return     */    public static String dumpHexString(byte[] array, int offset, int length) {        StringBuilder result = new StringBuilder();        byte[] line = new byte[16];        int lineIndex = 0;        result.append("\n0x");        result.append(toHexString(offset));        for (int i = offset; i < offset + length; i++) {            if (lineIndex == 16) {                result.append(" ");                for (int j = 0; j < 16; j++) {                    if (line[j] > ' ' && line[j] < '~') {                        result.append(new String(line, j, 1));                    } else {                        result.append(".");                    }                }                result.append("\n0x");                result.append(toHexString(i));                lineIndex = 0;            }            byte b = array[i];            result.append(" ");            result.append(HEX_DIGITS[(b >>> 4) & 0x0F]);            result.append(HEX_DIGITS[b & 0x0F]);            line[lineIndex++] = b;        }        if (lineIndex != 16) {            int count = (16 - lineIndex) * 3;            count++;            for (int i = 0; i < count; i++) {                result.append(" ");            }            for (int i = 0; i < lineIndex; i++) {                if (line[i] > ' ' && line[i] < '~') {                    result.append(new String(line, i, 1));                } else {                    result.append(".");                }            }        }        return result.toString();    }    /**     * 字节转16进制String     *     * @param b 字节     * @return     */    public static String toHexString(byte b) {        return toHexString(toByteArray(b));    }    /**     * 字节数组转16进制String，无分隔，如：FE00120F0E     *     * @param array 字节数组     * @return     */    public static String toHexString(byte[] array) {        return toHexString(array, 0, array.length);    }    /**     * 字节数组转16进制String，无分隔，如：FE00120F0E     *     * @param array  字节数组     * @param offset 起始     * @param length 长度     * @return     */    public static String toHexString(byte[] array, int offset, int length) {        char[] buf = new char[length * 2];        int bufIndex = 0;        for (int i = offset; i < offset + length; i++) {            byte b = array[i];            buf[bufIndex++] = HEX_DIGITS[(b >>> 4) & 0x0F];            buf[bufIndex++] = HEX_DIGITS[b & 0x0F];        }        return new String(buf);    }    /**     * int转16进制String     *     * @param i     * @return     */    public static String toHexString(int i) {        return toHexString(toByteArray(i));    }    /**     * 字节转数组     *     * @param b     * @return     */    public static byte[] toByteArray(byte b) {        byte[] array = new byte[1];        array[0] = b;        return array;    }    /**     * int转字节数组     *     * @param i     * @return     */    public static byte[] toByteArray(int i) {        byte[] array = new byte[4];        array[3] = (byte) (i & 0xFF);        array[2] = (byte) ((i >> 8) & 0xFF);        array[1] = (byte) ((i >> 16) & 0xFF);        array[0] = (byte) ((i >> 24) & 0xFF);        return array;    }    /**     * 十六进制转int     *     * @param c     * @return     */    private static int toByte(char c) {        if (c >= '0' && c <= '9') return (c - '0');        if (c >= 'A' && c <= 'F') return (c - 'A' + 10);        if (c >= 'a' && c <= 'f') return (c - 'a' + 10);        throw new RuntimeException("Invalid hex char '" + c + "'");    }    /**     * 十六进制字符串转字节数组     *     * @param hexString 如：FE00120F0E     * @return     */    public static byte[] hexStringToByteArray(String hexString) {        int length = hexString.length();        byte[] buffer = new byte[length / 2];        for (int i = 0; i < length; i += 2) {            buffer[i / 2] = (byte) ((toByte(hexString.charAt(i)) << 4) | toByte(hexString.charAt(i + 1)));        }        return buffer;    }}