[数据结构与算法]java10进制转换成16进制，4 字节，低位在前，高位在后

    /**
     * 4字节
     * 低位在前，高位在后
     *
     * @param n
     * @return
     */
    public static byte[] unlong2H4bytes(long n) {
        byte[] b = new byte[4];
        b[0] = (byte) (n & 0xff);
        b[1] = (byte) (n >> 8 & 0xff);
        b[2] = (byte) (n >> 16 & 0xff);
        b[3] = (byte) (n >> 24 & 0xff);
        return b;
    }

    /**
     * byte数组转为十六进制字符串
     *
     * @param bytes
     * @return
     */
    public static String byte2Hex(byte[] bytes) {
        StringBuffer hexString = new StringBuffer();
        for (int i = 0; i < bytes.length; i++) {
            String hex = Integer.toHexString(0xff & bytes[i]);
            if (hex.length() == 1) {
                hexString.append('0');
            }
            hexString.append(hex);
        }
        return hexString.toString();
    }

执行

int startTimeSecond = 1629359452;
byte[] bytes2 = unlong2H4bytes(startTimeSecond);
String s1 = byte2Hex(bytes2);
log.info("{}", s1);

输出

5c0d1e61

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