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NET可以通过多种方式实现zip的压缩和解压

选择字号: 超大 标准 发布时间:2012-8-29 16:43:13 | 作者:admin | 0个评论 | 人浏览

      在.NET可以通过多种方式实现zip的压缩和解压:1、使用System.IO.Packaging;2、使用第三方类库;3、通过 System.IO.Compression 命名空间中新增的ZipArchive、ZipFile等类实现。

     一、使用System.IO.Packaging压缩和解压

     Package为一个抽象类,可用于将对象组织到定义的物理格式的单个实体中,从而实现可移植性与高效访问。ZIP 文件是Package的主物理格式。 其他Package实现可以使用其他物理格式(如 XML 文档、数据库或 Web 服务。与文件系统类似,在分层组织的文件夹和文件中引用 Package 中包含的项。虽然 Package 是抽象类,但 Package.Open 方法默认使用 ZipPackage 派生类。

    System.IO.Packaging在WindowsBase.dll程序集下,使用时需要添加对WindowsBase的引用。

    1、将整个文件夹压缩成zip

/// <summary>         /// Add a folder along with its subfolders to a Package         /// </summary>         /// <param name="folderName">The folder to add</param>         /// <param name="compressedFileName">The package to create</param>         /// <param name="overrideExisting">Override exsisitng files</param>         /// <returns></returns>         static bool PackageFolder(string folderName, string compressedFileName, bool overrideExisting)         {             if (folderName.EndsWith(@"\"))                 folderName = folderName.Remove(folderName.Length - 1);             bool result = false;             if (!Directory.Exists(folderName))             {                 return result;             }              if (!overrideExisting && File.Exists(compressedFileName))             {                 return result;             }             try             {                 using (Package package = Package.Open(compressedFileName, FileMode.Create))                 {                     var fileList = Directory.EnumerateFiles(folderName, "*", SearchOption.AllDirectories);                     foreach (string fileName in fileList)                     {                                                 //The path in the package is all of the subfolders after folderName                         string pathInPackage;                         pathInPackage = Path.GetDirectoryName(fileName).Replace(folderName, string.Empty) + "/" + Path.GetFileName(fileName);                          Uri partUriDocument = PackUriHelper.CreatePartUri(new Uri(pathInPackage, UriKind.Relative));                         PackagePart packagePartDocument = package.CreatePart(partUriDocument,"", CompressionOption.Maximum);                         using (FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read))                         {                             fileStream.CopyTo(packagePartDocument.GetStream());                         }                     }                 }                 result = true;             }             catch (Exception e)             {                 throw new Exception("Error zipping folder " + folderName, e);             }                         return result;         }

      2、将单个文件添加到zip文件中

       /// <summary>         /// Compress a file into a ZIP archive as the container store         /// </summary>         /// <param name="fileName">The file to compress</param>         /// <param name="compressedFileName">The archive file</param>         /// <param name="overrideExisting">override existing file</param>         /// <returns></returns>         static bool PackageFile(string fileName, string compressedFileName, bool overrideExisting)         {             bool result = false;              if (!File.Exists(fileName))             {                 return result;             }              if (!overrideExisting && File.Exists(compressedFileName))             {                 return result;             }              try             {                 Uri partUriDocument = PackUriHelper.CreatePartUri(new Uri(Path.GetFileName(fileName), UriKind.Relative));                                 using (Package package = Package.Open(compressedFileName, FileMode.OpenOrCreate))                 {                     if (package.PartExists(partUriDocument))                     {                         package.DeletePart(partUriDocument);                     }                       PackagePart packagePartDocument = package.CreatePart(partUriDocument, "", CompressionOption.Maximum);                     using (FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read))                     {                         fileStream.CopyTo(packagePartDocument.GetStream());                     }                 }                 result = true;             }             catch (Exception e)             {                 throw new Exception("Error zipping file " + fileName, e);             }                          return result;         }

       3、zip文件解压

/// <summary>         /// Extract a container Zip. NOTE: container must be created as Open Packaging Conventions (OPC) specification         /// </summary>         /// <param name="folderName">The folder to extract the package to</param>         /// <param name="compressedFileName">The package file</param>         /// <param name="overrideExisting">override existing files</param>         /// <returns></returns>         static bool UncompressFile(string folderName, string compressedFileName, bool overrideExisting)         {             bool result = false;             try             {                 if (!File.Exists(compressedFileName))                 {                     return result;                 }                  DirectoryInfo directoryInfo = new DirectoryInfo(folderName);                 if (!directoryInfo.Exists)                     directoryInfo.Create();                  using (Package package = Package.Open(compressedFileName, FileMode.Open, FileAccess.Read))                 {                     foreach (PackagePart packagePart in package.GetParts())                     {                         ExtractPart(packagePart, folderName, overrideExisting);                     }                 }                  result = true;             }             catch (Exception e)             {                 throw new Exception("Error unzipping file " + compressedFileName, e);             }                          return result;         }          static void ExtractPart(PackagePart packagePart, string targetDirectory, bool overrideExisting)         {             string stringPart = targetDirectory + HttpUtility.UrlDecode(packagePart.Uri.ToString()).Replace('\\', '/');              if (!Directory.Exists(Path.GetDirectoryName(stringPart)))                 Directory.CreateDirectory(Path.GetDirectoryName(stringPart));              if (!overrideExisting && File.Exists(stringPart))                 return;             using (FileStream fileStream = new FileStream(stringPart, FileMode.Create))             {                 packagePart.GetStream().CopyTo(fileStream);             }         }

 

      使用Package压缩文件会在zip文件自动生成[Content_Type].xml,用来描述zip文件解压支持的文件格式。

<?xml version="1.0" encoding="utf-8" ?>  <Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types">     <Default Extension="vsixmanifest" ContentType="text/xml" />      <Default Extension="dll" ContentType="application/octet-stream" />      <Default Extension="png" ContentType="application/octet-stream" />      <Default Extension="txt" ContentType="text/plain" />      <Default Extension="pkgdef" ContentType="text/plain" />  </Types>

 

      同样,如果zip文件不包含[Content_Type].xml文件,或者[Content_Type].xml文件不包含所对应扩展名的描述(手动添加的[Content_Type].xml也是可以),将无法解压文件。

      二、使用第三方类库

      zip的压缩和解压使用比较的有SharpZipLibDotNetZip

      1、SharpZipLib,也称为“#ziplib”,基于GPL开源,支持Zip,GZip,Tar和BZip2的压缩和解压缩。

      支持.NET 1.1,NET 2.0(3.5、4.0).

      (1)zip压缩

public static void Zip(string SrcFile, string DstFile, int BufferSize) {     FileStream fileStreamIn = new FileStream 		(SrcFile, FileMode.Open, FileAccess.Read);     FileStream fileStreamOut = new FileStream 		(DstFile, FileMode.Create, FileAccess.Write);     ZipOutputStream zipOutStream = new ZipOutputStream(fileStreamOut);     byte[] buffer = new byte<buffersize />;     ZipEntry entry = new ZipEntry(Path.GetFileName(SrcFile));     zipOutStream.PutNextEntry(entry);     int size;     do     {         size = fileStreamIn.Read(buffer, 0, buffer.Length);         zipOutStream.Write(buffer, 0, size);     } while (size > 0);     zipOutStream.Close();     fileStreamOut.Close();     fileStreamIn.Close(); }

       (2)解压zip

public static void UnZip(string SrcFile, string DstFile, int BufferSize) {     FileStream fileStreamIn = new FileStream 		(SrcFile, FileMode.Open, FileAccess.Read);     ZipInputStream zipInStream = new ZipInputStream(fileStreamIn);     ZipEntry entry = zipInStream.GetNextEntry();     FileStream fileStreamOut = new FileStream 		(DstFile + @"\" + entry.Name, FileMode.Create, FileAccess.Write);     int size;     byte[] buffer = new byte<buffersize />;     do     {         size = zipInStream.Read(buffer, 0, buffer.Length);         fileStreamOut.Write(buffer, 0, size);     } while (size > 0);     zipInStream.Close();     fileStreamOut.Close();     fileStreamIn.Close(); }

      2、DotNetLib,是基于”WS-PL”开源,使用比较简单
     (1)压缩

using (ZipFile zip = new ZipFile())   {     zip.AddFile("ReadMe.txt");     zip.AddFile("7440-N49th.png");     zip.AddFile("2008_Annual_Report.pdf");             zip.Save("Archive.zip");   }

     (2)解压

private void MyExtract()   {       string zipToUnpack = "C1P3SML.zip";       string unpackDirectory = "Extracted Files";       using (ZipFile zip1 = ZipFile.Read(zipToUnpack))       {           // here, we extract every entry, but we could extract conditionally           // based on entry name, size, date, checkbox status, etc.             foreach (ZipEntry e in zip1)           {             e.Extract(unpackDirectory, ExtractExistingFileAction.OverwriteSilently);           }        }     }

 

 

 

    三、在.NET 4.5使用ZipArchive、ZipFile等类压缩和解压

        static void Main(string[] args)         {             string ZipPath = @"c:\users\exampleuser\start.zip";             string ExtractPath = @"c:\users\exampleuser\extract";             string NewFile = @"c:\users\exampleuser\NewFile.txt";              using (ZipArchive Archive = ZipFile.Open(ZipPath, ZipArchiveMode.Update))             {                 Archive.CreateEntryFromFile(NewFile, "NewEntry.txt");                 Archive.ExtractToDirectory(ExtractPath);             }          }

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