• asp.net在线压缩和解压缩的实现


    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,这里我采用SharpZlib来实现,听说VS2005已有压缩和解压缩的解决方案,我还没有时间用VS2005,所以就只好使用VS2003 + SharpZlib来解决问题了。

    vs2005 版本(太方便了) http://www.cnblogs.com/skylaugh/archive/2010/01/20/1652460.html

    1、首先从这里http://jaist.dl.sourceforge.net/sourceforge/sharpdevelop/084SharpZipLib_SourceSamples.zip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("http://www.cnblogs.com/skylaugh/admin/file://")+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" %>&nbsp;
    <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
     }
    }

    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,我没有时间解决了,各位如有解决方案,不妨共享一下。

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  • 原文地址:https://www.cnblogs.com/skylaugh/p/699458.html
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