C# 字符串转16进制，16进制转Base64 哈哈哈 uf65/rn+

测试：

哈哈哈 uf65/rn+

场景描述：

对接java接口，字符串转16进制再转base64；遇到转换不一样问题；后来定位对方编码格式不对；

 测试代码：

string str = "哈哈哈abcABC123";
///字符串转换Base64
string sendStr =GetJavaBase64ByStr(str);

//Base64转字符串
string resStr = GetStrByGetJavaBase64Str(sendStr);

 

封装代码如下：

  #region  对接java接口 Base64转换string字符串
        /// <summary>
        /// 逆向转换（java接口Base64转换string字符串）
        /// </summary>
        /// <param name="base64Str"></param>
        /// <returns></returns>
        public static string GetStrByGetJavaBase64Str(string base64Str)
        {
            string hexStr = GetHexStrByBase64Str(base64Str);
            string resStr = GetStrByHexStr(hexStr);
            return resStr;
        }

        /// <summary>
        /// 16进制字符串转字符串
        /// </summary>
        /// <param name="hexStr"></param>
        /// <returns></returns>
        public static string GetStrByHexStr(string hexStr)
        {
            byte[] buf1 = new byte[hexStr.Length / 2];
            for (int i = 0; i < hexStr.Length; i += 2)
            {
                // 将 16进制字符串 中的每两个字符转换成 byte，并加入到新申请的 byte数组 中
                buf1[i / 2] = Convert.ToByte(hexStr.Substring(i, 2), 16);
            }
            // 将 byte数组 解码成 字符串：
            //string resStr = Encoding.Default.GetString(buf1);
            string resStr = Encoding.GetEncoding("GB18030").GetString(buf1);
            return resStr;
        }

        /// <summary>
        /// Base64字符串转16进制字符串
        /// </summary>
        /// <param name="basestr"></param>
        /// <returns></returns>
        public static string GetHexStrByBase64Str(string base64Str)
        {
            try
            {
                byte[] bytes = System.Convert.FromBase64String(base64Str);
                //return byteToHexStr(bytes);
                string returnStr = "";
                if (bytes != null)
                {
                    for (int i = 0; i < bytes.Length; i++)
                    {
                        returnStr += bytes[i].ToString("X2");
                    }
                }
                return returnStr;
            }
            catch (FormatException ex)
            {
                //转换失败
                return null;
            }
        }


        #endregion 对接java接口 Base64转换string字符串

        #region 对接java接口 string字符串转换Base64
        public static string GetJavaBase64ByStr(string str)
        {
            string strHex = GetHexByString(str, Encoding.GetEncoding("GB18030"));
            string resStr = GetBase64By16Str(strHex);
            return resStr;
        }
        /// <summary>
        /// 字符串转16进制通过
        /// </summary>
        /// <param name="str"></param>
        /// <param name="encode"></param>
        /// <returns></returns>
        public static string GetHexByString(string str, Encoding encode)
        {
            byte[] b = encode.GetBytes(str);
            StringBuilder result = new StringBuilder();
            for (int i = 0; i < b.Length; i++)
            {
                result.Append(Convert.ToString(b[i], 16));
            }
            return result.ToString();
        }


        /// <summary>
        /// 进制字符串转Base64
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string GetBase64By16Str(string str)
        {
            try
            {

                System.Text.RegularExpressions.MatchCollection mc = Regex.Matches(str.ToString().ToUpper(), "[a-fA-F0-9]{2}");
                byte[] bytes = new byte[mc.Count];
                for (int i = 0; i < mc.Count; i++)
                {
                    bytes[i] = byte.Parse(mc[i].Value, System.Globalization.NumberStyles.HexNumber);
                }
                string res = Convert.ToBase64String(bytes);
                //解决特殊编码问题
                //res = System.Web.HttpUtility.UrlEncode(res);
                //string res =res.Replace("%", "").Replace(",", "").Replace(" ", "+");
                return res;
            }
            catch (FormatException)
            {
                //转换失败
                return null;
            }
        }
        #endregion