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ASP.NET實現文件的在線壓縮和解壓縮

2024-07-10 11:55:55
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  我們經常會遇到批量上傳的問題,也會遇到將某個目錄下所有文件都上傳到服務器上的問題。那么,如何解決此類問題呢?以前的技術一般采用ActiveX等方式,這里筆者采用SharpZlib來實現,聽說VS2005已有壓縮和解壓縮的解決方案,筆者還沒有時間用VS2005,所以就只好使用VS2003 + SharpZlib來解決問題了。

  1、首先從這里下載0.84版本的SharpZlib源碼及示例碼。

  2、下載下來之后你發現它沒有VS2003的解決方案文件,沒有關系。你可以自己建立,首先新建一個ZipUnzip的解決方案,然后,將上面經過解壓縮之后的所有文件及目錄COPY到你的解決方案所在的目錄下。

  3、在VS2003解決方案資源管理器(一般是在右上方中部點的位置)中點擊顯示所有文件按鈕,然后可以見到很多“虛”的圖標、文件及文件夾等,可以一次選擇它們,然后包含進項目中。

  4、編譯,最好使用Release選項,編譯完成之后你可以在/bin/Release/看到ZipUnzip.dll的類了。如果你編譯時報錯,說什么AssemblyKeyFile之類的,你可以使用強命名工具新建一個,也可以將AssemblyInfo.cs中[assembly: AssemblyKeyFile("。。。。。")]改成:[assembly: AssemblyKeyFile("")] (不推薦這樣做)。

  5、新建一個WEBFORM項目,添加ZipUnzip.dll類的引用,然后添加如下文件及內容:
 

// ------------------------------------------
// 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;//待解壓的文件
   FileProperties[1]=zipFile.Substring(0,zipFile.LastIndexOf("//")+1);//解壓后放置的目標目錄
   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
 {
  ///
  /// 解壓文件
  ///
  /// 包含要解壓的文件名和要解壓到的目錄名數組
  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);

     //生成解壓目錄
     Directory.CreateDirectory(directoryName);

     if (fileName != String.Empty)
     {
      //解壓文件到指定的目錄
      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
{
 ///
 /// 壓縮文件
 ///
 public class ZipClass
 {
  public void ZipFile(string FileToZip, string ZipedFile ,int CompressionLevel, int BlockSize,string password)
  {
   //如果文件沒有找到,則報錯
   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)
   {
    //打開壓縮文件
    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 壓縮
  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
   //待壓縮文件
   FileProperties[0]=fullName;

   //壓縮后的目標文件
   FileProperties[1]= destPath +"//"+ System.IO.Path.GetFileNameWithoutExtension(fullName) + ".zip";
   ZipClass Zc=new ZipClass();
   Zc.ZipFileMain(FileProperties);

   //刪除壓縮前的文件
   System.IO.File.Delete(fullName);
  }

  #endregion

  #region 解壓
  private void Button2_Click(object sender, System.EventArgs e)
  {
   string fullName=this.File1.PostedFile.FileName;//C:/test/a.zip
   //解壓文件
   //AttachmentUnZip.UpZip(fullName);

   // string[] FileProperties = new string[2];
   // FileProperties[0] = fullName;//待解壓的文件
   // FileProperties[1] = System.IO.Path.GetDirectoryName(fullName);//解壓后放置的目標目錄
   // 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
 }
}

  此方案解決了文件名中文字的問題,目錄解壓縮問題。

  至于整個文件夾批量上傳并壓縮成一個WINZIP壓縮包的問題,沒有時間解決了,各位如有解決方案,不妨共享一下。

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