用ASP.Net实现文件的在线压缩和解压缩

    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
   {
   /// <summary>
   /// 解压文件
   /// </summary>
   /// <param name="args">包含要解压的文件名和要解压到的目录名数组</param>
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
  {
   /// <summary>
   /// 压缩文件
   /// </summary>
   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
  // ---------------------------------------------
   <%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="WebZipUnzip.WebForm1" %> 
  <META content="Microsoft Visual Studio .NET 7.1" name=GENERATOR>
  <META content=C# name=CODE_LANGUAGE>
  <META content=JavaScript name=vs_defaultClientScript>
  <META content=http://schemas.microsoft.com/intellisense/ie5 name=vs_targetSchema>
  <FORM id=Form1 method=post runat="server"><?xml:namespace prefix = asp /><asp:Button id=Button1 style="Z-INDEX: 101; LEFT: 56px; POSITION: absolute; TOP: 64px" runat="server" Text="压缩"></asp:Button><asp:Button id=Button2 style="Z-INDEX: 102; LEFT: 112px; POSITION: absolute; TOP: 64px" runat="server" Text="解压"></asp:Button><INPUT id=File1 style="Z-INDEX: 103; LEFT: 32px; POSITION: absolute; TOP: 24px" type=file name=File1 runat="server"> </FORM></BODY></HTML> 
 
  //-------------------------------------------
  // 5.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>
   /// Summary description for WebForm1.
   /// </summary>
   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);
   }
  
   /// <summary>
   /// Required method for Designer support - do not modify
   /// the contents of this method with the code editor.
   /// </summary>
   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
   }
  }