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用ASP.NET实现文件的在线压缩和解压缩

2013-08-29 19:23 585 查看
我们经常会遇到批量上传的问题,也会遇到将某个目录下所有文件都上传到服务器上的问题。那么,如何解决此类问题呢?以前的技术一般采用ActiveX等方式,这里笔者采用SharpZlib来实现,听说VS2005已有压缩和解压缩的解决方案,笔者还没有时间用VS2005,所以就只好使用VS2003
+ SharpZlib来解决问题了。

  1、首先从这里下载0.84版本的SharpZlib源码及示例码。

  2、下载下来之后你发现它没有VS2003的解决方案文件,没有关系。你可以自己建立,首先新建一个ZipUnzip的解决方案,然后,将上面经过解压缩之后的所有文件及目录COPY到你的解决方案所在的目录下。

  3、在VS2003解决方案资源管理器(一般是在右上方中部点的位置)中点击显示所有文件按钮,然后可以见到很多“虚”的图标、文件及文件夹等,可以一次选择它们,然后包含进项目中。

  4、编译,最好使用Release选项,编译完成之后你可以在\bin\Release\看到ZipUnzip.dll的类了。如果你编译时报错,说什么AssemblyKeyFile之类的,你可以使用强命名工具新建一个,也可以将AssemblyInfo.cs中[assembly: AssemblyKeyFile("。。。。。")]改成:[assembly: AssemblyKeyFile("")] (不推荐这样做)。

  5、新建一个WEBFORM项目,添加ZipUnzip.dll类的引用,然后添加如下文件及内容:

// ------------------------------------------

// 1. AttachmentUnZip.cs

// ------------------------------------------

using System;

using System.IO;

using ICSharpCode.SharpZipLib.Zip;

using ICSharpCode.SharpZipLib.GZip;

using ICSharpCode.SharpZipLib.BZip2;

using ICSharpCode.SharpZipLib.Checksums;

using ICSharpCode.SharpZipLib.Zip.Compression;

using ICSharpCode.SharpZipLib.Zip.Compression.Streams;

namespace WebZipUnzip

{

 public class AttachmentUnZip

 {

  public AttachmentUnZip()

  {}

  public static void UpZip(string zipFile)

  {

   string []FileProperties=new string[2];

   FileProperties[0]=zipFile;//待解压的文件

   FileProperties[1]=zipFile.Substring(0,zipFile.LastIndexOf("\\")+1);//解压后放置的目标目录

   UnZipClass UnZc=new UnZipClass();

   UnZc.UnZip(FileProperties);

  }

 }

}

// ---------------------------------------------

// 2. UnZipClass.cs

// ---------------------------------------------

using System;

using System.IO;

using ICSharpCode.SharpZipLib.Zip;

using ICSharpCode.SharpZipLib.GZip;

using ICSharpCode.SharpZipLib.BZip2;

using ICSharpCode.SharpZipLib.Checksums;

using ICSharpCode.SharpZipLib.Zip.Compression;

using ICSharpCode.SharpZipLib.Zip.Compression.Streams;

namespace WebZipUnzip

{

 public class UnZipClass

 {

  ///

  /// 解压文件

  ///

  /// 包含要解压的文件名和要解压到的目录名数组

  public void UnZip(string[] args)

  {

   ZipInputStream s = new ZipInputStream(File.OpenRead(args[0]));

   try

   {

    ZipEntry theEntry;

    while ((theEntry = s.GetNextEntry()) != null)

    {

     string directoryName = Path.GetDirectoryName(args[1]);

     string fileName = Path.GetFileName(theEntry.Name);

     //生成解压目录

     Directory.CreateDirectory(directoryName);

     if (fileName != String.Empty)

     {

      //解压文件到指定的目录

      FileStream streamWriter = File.Create(args[1]+fileName);

      int size = 2048;

      byte[] data = new byte[2048];

      while (true)

      {

       size = s.Read(data, 0, data.Length);

       if (size > 0)

       {

        streamWriter.Write(data, 0, size);

       }

       else

       {

        break;

       }

      }

      streamWriter.Close();

     }

    }

    s.Close();

   }

   catch(Exception eu)

   {

    throw eu;

   }

   finally

   {

    s.Close();

   }

  }//end UnZip

  public static bool UnZipFile(string file, string dir)

  {

   try

   {

    if (!Directory.Exists(dir))

     Directory.CreateDirectory(dir);

     string fileFullName = Path.Combine(dir,file);

     ZipInputStream s = new ZipInputStream(File.OpenRead( fileFullName ));

 

     ZipEntry theEntry;

     while ((theEntry = s.GetNextEntry()) != null)

     {

      string directoryName = Path.GetDirectoryName(theEntry.Name);

      string fileName = Path.GetFileName(theEntry.Name);

 

      if (directoryName != String.Empty)

       Directory.CreateDirectory( Path.Combine(dir, directoryName));

       if (fileName != String.Empty)

       {

        FileStream streamWriter = File.Create( Path.Combine(dir,theEntry.Name) );

        int size = 2048;

        byte[] data = new byte[2048];

        while (true)

        {

         size = s.Read(data, 0, data.Length);

         if (size > 0)

         {

          streamWriter.Write(data, 0, size);

         }

         else

         {

          break;

         }

        }

        streamWriter.Close();

       }

      }

      s.Close();

      return true;

     }

     catch (Exception)

     {

      throw;

     }

    }

   }//end UnZipClass

  }

// ----------------------------------------------

// 3. ZipClass.cs

// ----------------------------------------------

using System;

using System.IO;

using ICSharpCode.SharpZipLib.Zip;

using ICSharpCode.SharpZipLib.GZip;

using ICSharpCode.SharpZipLib.BZip2;

using ICSharpCode.SharpZipLib.Checksums;

using ICSharpCode.SharpZipLib.Zip.Compression;

using ICSharpCode.SharpZipLib.Zip.Compression.Streams;

namespace WebZipUnzip

{

 ///

 /// 压缩文件

 ///

 public class ZipClass

 {

  public void ZipFile(string FileToZip, string ZipedFile ,int CompressionLevel, int BlockSize,string password)

  {

   //如果文件没有找到,则报错

   if (! System.IO.File.Exists(FileToZip))

   {

    throw new System.IO.FileNotFoundException("The specified file " + FileToZip + " could not be found. Zipping aborderd");

   }

   System.IO.FileStream StreamToZip = new System.IO.FileStream(FileToZip,System.IO.FileMode.Open , System.IO.FileAccess.Read);

   System.IO.FileStream ZipFile = System.IO.File.Create(ZipedFile);

   ZipOutputStream ZipStream = new ZipOutputStream(ZipFile);

   ZipEntry ZipEntry = new ZipEntry("ZippedFile");

   ZipStream.PutNextEntry(ZipEntry);

   ZipStream.SetLevel(CompressionLevel);

   byte[] buffer = new byte[BlockSize];

   System.Int32 size =StreamToZip.Read(buffer,0,buffer.Length);

   ZipStream.Write(buffer,0,size);

   try

   {

    while (size < StreamToZip.Length)

    {

     int sizeRead =StreamToZip.Read(buffer,0,buffer.Length);

     ZipStream.Write(buffer,0,sizeRead);

     size += sizeRead;

    }

   }

   catch(System.Exception ex)

   {

    throw ex;

   }

   ZipStream.Finish();

   ZipStream.Close();

   StreamToZip.Close();

  }

  public void ZipFileMain(string[] args)

  {

   //string[] filenames = Directory.GetFiles(args[0]);

   string[] filenames = new string[]{args[0]};

 

   Crc32 crc = new Crc32();

   ZipOutputStream s = new ZipOutputStream(File.Create(args[1]));

   s.SetLevel(6); // 0 - store only to 9 - means best compression

   foreach (string file in filenames)

   {

    //打开压缩文件

    FileStream fs = File.OpenRead(file);

    byte[] buffer = new byte[fs.Length];

    fs.Read(buffer, 0, buffer.Length);

    ZipEntry entry = new ZipEntry(file);

    entry.DateTime = DateTime.Now;

    // set Size and the crc, because the information

    // about the size and crc should be stored in the header

    // if it is not set it is automatically written in the footer.

    // (in this case size == crc == -1 in the header)

    // Some ZIP programs have problems with zip files that don't store

    // the size and crc in the header.

    entry.Size = fs.Length;

    fs.Close();

    crc.Reset();

    crc.Update(buffer);

    entry.Crc = crc.Value;

    s.PutNextEntry(entry);

    s.Write(buffer, 0, buffer.Length);

   }

   s.Finish();

   s.Close();

  }

 }

}

// ---------------------------------------------

// 4.WebForm1.aspx.cs

//-------------------------------------------

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.IO;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

namespace WebZipUnzip

{

 ///

 /// Summary description for WebForm1.

 ///

 public class WebForm1 : System.Web.UI.Page

 {

  protected System.Web.UI.WebControls.Button Button1;

  protected System.Web.UI.HtmlControls.HtmlInputFile File1;

  protected System.Web.UI.WebControls.Button Button2;

  private void Page_Load(object sender, System.EventArgs e)

  {

   // Put user code to initialize the page here

  }

  #region Web Form Designer generated code

  override protected void OnInit(EventArgs e)

  {

   //

   // CODEGEN: This call is required by the
ASP.NET Web Form Designer.

   //

   InitializeComponent();

   base.OnInit(e);

  }

  ///

  /// Required method for Designer support - do not modify

  /// the contents of this method with the code editor.

  ///

  private void InitializeComponent()

  {

   this.Button1.Click += new System.EventHandler(this.Button1_Click);

   this.Button2.Click += new System.EventHandler(this.Button2_Click);

   this.Load += new System.EventHandler(this.Page_Load);

  }

  #endregion

  #region 压缩

  private void Button1_Click(object sender, System.EventArgs e)

  {

   string []FileProperties=new string[2];

   string fullName=this.File1.PostedFile.FileName;//C:\test\a.txt

   string destPath=System.IO.Path.GetDirectoryName(fullName);//C:\test

   //待压缩文件

   FileProperties[0]=fullName;

   //压缩后的目标文件

   FileProperties[1]= destPath +"\\"+ System.IO.Path.GetFileNameWithoutExtension(fullName) + ".zip";

   ZipClass Zc=new ZipClass();

   Zc.ZipFileMain(FileProperties);

   //删除压缩前的文件

   System.IO.File.Delete(fullName);

  }

  #endregion

  #region 解压

  private void Button2_Click(object sender, System.EventArgs e)

  {

   string fullName=this.File1.PostedFile.FileName;//C:\test\a.zip

   //解压文件

   //AttachmentUnZip.UpZip(fullName);

   // string[] FileProperties = new string[2];

   // FileProperties[0] = fullName;//待解压的文件

   // FileProperties[1] = System.IO.Path.GetDirectoryName(fullName);//解压后放置的目标目录

   // UnZipClass UnZc=new UnZipClass();

   // UnZc.UnZip(FileProperties);

   string dir = System.IO.Path.GetDirectoryName(fullName);

   string fileName = System.IO.Path.GetFileName(fullName);

   UnZipClass.UnZipFile(fileName, dir);

  }

  #endregion

 }

}
  此方案解决了文件名中文字的问题,目录解压缩问题。

  至于整个文件夹批量上传并压缩成一个WINZIP压缩包的问题,没有时间解决了,各位如有解决方案,不妨共享一下。
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