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      asp.NET中实现文件的压缩和解压(3种方式)
      发布时间:2016-12-21 08:07:43 关键词: asp.net,压缩文件,asp.net解压文件,.net,解压缩
      内容简介:本篇文章主要介绍了asp.NET中实现文件的压缩和解压,这里整理了详细的代码,有需要的小伙伴可以参考下。<br />

    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SharpZipLib和DotNetZip。

    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);
       } 
      }
    
    

    以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持乐码库。

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