Zip加解压字符串

一、首先下载引用“ICSharpCode.SharpZipLib.dll”

 

二、字符串压缩

 /// <summary>
        /// 将传入的二进制字符串资料以Zip算法解压缩
        /// </summary>
        /// <param name="zippedString">经GZip压缩后的二进制字符串</param>
        /// <returns>原始未压缩字符串</returns>
        public static string ZipDecompressString(this string zippedString)
        {
            if (string.IsNullOrEmpty(zippedString) || zippedString.Length == 0)
            {
                return "";
            }
            else
            {
                string dummyData = zippedString;
                dummyData = dummyData.Trim().Replace("%", "").Replace(",", "").Replace(" ", "+").Replace("\"", "").Replace("\\n", "");

                //}
                byte[] b = Convert.FromBase64String(dummyData);
                using (MemoryStream from = new MemoryStream(b))
                using (ZipInputStream zip = new ZipInputStream(from))
                using (MemoryStream to = new MemoryStream())
                {
                    ZipEntry entry = zip.GetNextEntry();
                    byte[] buffer = new byte[1024];
                    int len = 0;
                    while ((len = zip.Read(buffer, 0, buffer.Length)) > 0)
                    {
                        to.Write(buffer, 0, len);
                    }
                    b = to.ToArray();
                    return Encoding.UTF8.GetString(b);
                }
            }
        }

 

三、压缩字符串解压

/// <summary>
        /// 将传入字符串以Zip算法压缩后，返回utf-8格式Base64编码字符
        /// </summary>
        /// <param name="rawString">需要压缩的字符串</param>
        /// <returns>压缩后的Base64编码的字符串</returns>
        public static string ZipCompressString(this string rawString)
        {
            if (string.IsNullOrEmpty(rawString) || rawString.Length == 0)
            {
                return "";
            }
            else
            {
                byte[] rawData = System.Text.Encoding.UTF8.GetBytes(rawString);
                using (MemoryStream to = new MemoryStream())
                using (ZipOutputStream zip = new ZipOutputStream(to))
                {
                    ZipEntry entry = new ZipEntry("ToBase64String");
                    zip.PutNextEntry(entry);

                    zip.Write(rawData, 0, rawData.Length);
                    zip.CloseEntry();  // 必须，否则报不可预料的压缩文件末端
                    zip.Finish();      // 必须，否则报这个压缩文件格式未知或者数据已经被损坏
                    return Convert.ToBase64String(to.ToArray());
                }
            }
        }