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    首頁 > 開發 > .Net > 正文

    ASP.NET實現文件的在線壓縮和解壓縮

    2023-04-28 11:48:24
    字體:
    來源:轉載
    供稿:網友

      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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