com.dependencysec.b.DigestUtil Maven / Gradle / Ivy

Go to download
package com.dependencysec.b;

/**
 * @Author: zhengyoule
 * @Date: 2020/5/12 11:35 下午
 */
public class DigestUtil {


    /**
     * 字节转为十六进制字符串
     *
     * @return 十六进制字符串
     * @param字节
     */
    public static String byte2hex(byte[] b) {
        String hs = "";
        String stmp = "";
        for (int n = 0; b != null && n < b.length; n++) {
            stmp = (Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1) {
                hs = hs + "0" + stmp;
            } else {
                hs = hs + stmp;
            }
        }
        return hs;
    }

    /**
     * 十六进制字符转为字节
     *
     * @return 字节
     */
    public static byte[] hex2byte(byte[] b) {
        if ((b.length % 2) != 0) {
            throw new IllegalArgumentException("byte length is not correct");
        }
        byte[] b2 = new byte[b.length / 2];
        for (int n = 0; n < b.length; n += 2) {
            String item = new String(b, n, 2);
            b2[n / 2] = (byte) Integer.parseInt(item, 16);
        }
        return b2;
    }

    /**
     * 字符串转换成十六进制值
     *
     * @param bin String 我们看到的要转换成十六进制的字符串
     * @return
     */
    public static String bin2hex(String bin) {
        char[] digital = "0123456789ABCDEF".toCharArray();
        StringBuffer sb = new StringBuffer("");
        byte[] bs = bin.getBytes();
        int bit;
        for (int i = 0; i < bs.length; i++) {
            bit = (bs[i] & 0x0f0) >> 4;
            sb.append(digital[bit]);
            bit = bs[i] & 0x0f;
            sb.append(digital[bit]);
        }
        return sb.toString();
    }
}