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&#123; public class AttachmentUnZip &#123;  public AttachmentUnZip()  &#123;     &#125;  public static void UpZip(string zipFile)  &#123;   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);  &#125; &#125;&#125;// ---------------------------------------------// 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&#123; public class UnZipClass &#123;     /// <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)  &#123;   ZipInputStream s = new ZipInputStream(File.OpenRead(args[0]));   try   &#123;        ZipEntry theEntry;    while ((theEntry = s.GetNextEntry()) != null)     &#123;        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)      &#123;         //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)       &#123;       size = s.Read(data, 0, data.Length);       if (size > 0)        &#123;        streamWriter.Write(data, 0, size);       &#125;        else        &#123;        break;       &#125;      &#125;      streamWriter.Close();     &#125;    &#125;    s.Close();   &#125;   catch(Exception eu)   &#123;    throw eu;   &#125;   finally   &#123;    s.Close();   &#125;  &#125;//end UnZip  public static bool UnZipFile(string file, string dir)  &#123;   try   &#123;    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)    &#123;     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)     &#123;      FileStream streamWriter = File.Create( Path.Combine(dir,theEntry.Name) );      int size = 2048;      byte[] data = new byte[2048];      while (true)      &#123;       size = s.Read(data, 0, data.Length);       if (size > 0)       &#123;        streamWriter.Write(data, 0, size);       &#125;       else       &#123;        break;       &#125;      &#125;      streamWriter.Close();     &#125;    &#125;    s.Close();    return true;   &#125;   catch (Exception)   &#123;    throw;   &#125;  &#125; &#125;//end UnZipClass&#125;// ----------------------------------------------// 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&#123; /// <summary> /// 压缩文件 /// </summary> public class ZipClass &#123;  public void ZipFile(string FileToZip, string ZipedFile ,int CompressionLevel, int BlockSize,string password)  &#123;   //如果文件没有找到，则报错   if (! System.IO.File.Exists(FileToZip))    &#123;    throw new System.IO.FileNotFoundException("The specified file " + FileToZip + " could not be found. Zipping aborderd");   &#125;   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    &#123;    while (size < StreamToZip.Length)     &#123;     int sizeRead =StreamToZip.Read(buffer,0,buffer.Length);     ZipStream.Write(buffer,0,sizeRead);     size += sizeRead;    &#125;   &#125;    catch(System.Exception ex)   &#123;    throw ex;   &#125;   ZipStream.Finish();   ZipStream.Close();   StreamToZip.Close();  &#125;  public void ZipFileMain(string[] args)  &#123;   //string[] filenames = Directory.GetFiles(args[0]);   string[] filenames = new string[]&#123;args[0]&#125;;   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)    &#123;    //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);   &#125;     s.Finish();   s.Close();  &#125; &#125;&#125;// ---------------------------------------------// 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&#123; /// <summary> /// Summary description for WebForm1. /// </summary> public class WebForm1 : System.Web.UI.Page &#123;  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)  &#123;   // Put user code to initialize the page here  &#125;  #region Web Form Designer generated code  override protected void OnInit(EventArgs e)  &#123;   //   // CODEGEN: This call is required by the ASP.NET Web Form Designer.   //   InitializeComponent();   base.OnInit(e);  &#125;  /// <summary>  /// Required method for Designer support - do not modify  /// the contents of this method with the code editor.  /// </summary>  private void InitializeComponent()  &#123;       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);  &#125;  #endregion  #region 压缩  private void Button1_Click(object sender, System.EventArgs e)  &#123;   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);  &#125;  #endregion  #region 解压  private void Button2_Click(object sender, System.EventArgs e)  &#123;   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);  &#125;  #endregion &#125;&#125;　　OK! 试试看。　　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。