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ASP.NET实现文件的在线压缩和解压缩

来源:第一万维网   更新时间:2009-4-21 10:57:38

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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