ASP.NET实现文件的在线压缩和解压缩

时间:2021-05-02

  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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