Class ToolConvert

common/src/main/java/pro/tools/data/text/ToolConvert.java:20–541

转换相关工具 @author SeanDragon

 * @author SeanDragon
 */
public final class ToolConvert {
    private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};

    private ToolConvert() {
        throw new UnsupportedOperationException("我是工具类，别初始化我。。。");
    }

    /**
     * byteArr转hexString <p>例如：</p> bytes2HexString(new byte[] { 0, (byte) 0xa8 }) returns 00A8
     *
     * @param bytes
     *         字节数组
     *
     * @return 16进制大写字符串
     */
    public static String bytes2HexString(byte[] bytes) {
        if (bytes == null) {
            return null;
        }
        int len = bytes.length;
        if (len <= 0) {
            return null;
        }
        char[] ret = new char[len << 1];
        for (int i = 0, j = 0; i < len; i++) {
            ret[j++] = HEX_DIGITS[bytes[i] >>> 4 & 0x0f];
            ret[j++] = HEX_DIGITS[bytes[i] & 0x0f];
        }
        return new String(ret);
    }

    /**
     * hexString转byteArr <p>例如：</p> hexString2Bytes("00A8") returns { 0, (byte) 0xA8 }
     *
     * @param hexString
     *         十六进制字符串
     *
     * @return 字节数组
     */
    public static byte[] hexString2Bytes(String hexString) {
        if (ToolStr.isSpace(hexString)) {
            return null;
        }
        int len = hexString.length();
        if (len % 2 != 0) {
            hexString = "0" + hexString;
            len = len + 1;
        }
        char[] hexBytes = hexString.toUpperCase().toCharArray();
        byte[] ret = new byte[len >> 1];
        for (int i = 0; i < len; i += 2) {
            ret[i >> 1] = (byte) (hex2Dec(hexBytes[i]) << 4 | hex2Dec(hexBytes[i + 1]));
        }
        return ret;
    }

    /**
     * hexChar转int