各类型转换成定长

        ///

        /// 指定长度字符串 不足补空格
        ///

        /// 字符串
        /// 长度
        ///
        public static String formatTxt(String src, int len)
        {
            return formatTxt(src, len, " ", true);
        }
        ///

        /// 指定长度字符串 不足后面补充字符串
        ///

        /// 字符串
        /// 长度
        /// 补充字符串
        ///
        public static String formatTxt(String src, int len, String addC)
        {
            return formatTxt(src, len, addC, true);
        }
        ///

        /// 获取定长随机数
        ///

        ///
        ///
        public static String getRandom(int len)
        {
            int max &＃61; (int)Math.Pow(10.0D, len &＃43; 1) - 1;
            Random random &＃61; new Random();
            return formatInt(random.Next(max), len);
        }
        ///

        /// 指定长度 int 不足前面补充0
        ///

        ///
        ///
        ///
        public static String formatInt(int num, int len)
        {
            String str &＃61; num.ToString();
            return formatTxt(str, len, "0", false);
        }
        ///

        /// 获取定长的字符串
        ///

        /// 字符串
        /// 长度
        ///
        public static String getSubString(String str, int len)
        {
            byte[] bytes &＃61; ByteUtil.getBytes(str);
            if (bytes.Length > len)
            {
                byte[] copy &＃61; new byte[len];
                Array.Copy(bytes, copy, len);
                return getString(copy);
            }
            return str;
        }
        ///

        /// 指定长度字符串 不足补充字符串
        ///

        /// 字符串
        /// 长度
        /// 补充字符串
        /// true 后面补充
        ///
        public static String formatTxt(String src, int len, String addC, bool isAppend)
        {
            if (src &＃61;&＃61; null)
                src &＃61; "";
            String str &＃61; src;
            int dif_len &＃61; len - ByteUtil.getLength(str);
            for (int i &＃61; 0; i             {
                if (isAppend)
                    str &＃61; str &＃43; addC;
                else
                {
                    str &＃61; addC &＃43; str;
                }
            }
            if (Encoding.Default.GetBytes(str).Length > len)
                str &＃61; getSubString(str, len);
            return str;
        }
        ///

        /// byte[]转换成String
        ///

        ///
        ///
        public static String getString(byte[] bytes)
        {
            return System.Text.Encoding.Default.GetString(bytes);
        }