ASP.Net實現檔案的在線壓縮和解壓縮

ASP.Net實現檔案的在線壓縮和解壓縮

[來源：http://www.52jc.com.cn/netschool/biancheng/ASPNET/200704/netschool_20070407045831.html]
 
// ----------------------------------------------
// 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>
/// 壓縮檔
/// </summary>
public class ZipClass
{
  public void ZipFile(string FileToZip, string ZipedFile ,int CompressionLevel, int BlockSize,string password)
  {
   //如果檔案沒有找到，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)
   {
    //開啟壓縮檔
    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 c name=GENERATOR>
<META c# name=CODE_LANGUAGE>
<META c name=vs_defaultClientScript>
<META c://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="壓縮"></asp:Button><asp:Button id=Button2 style="Z-INDEX: 102; LEFT: 112px; POSITION: absolute; TOP: 64px" runat="server" Text="解壓"></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 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
   //待壓縮檔
   FileProperties[0]=fullName;
   //壓縮後的目標檔案
   FileProperties[1]= destPath +"\\"+ System.IO.Path.GetFileNameWithoutExtension(fullName) + ".zip";
   ZipClass Zc=new ZipClass();
   Zc.ZipFileMain(FileProperties);
   //刪除壓縮前的檔案
   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
   //解壓檔案
   //AttachmentUnZip.UpZip(fullName);
//   string[] FileProperties = new string[2];
//   FileProperties[0] = fullName;//待解壓的檔案
//   FileProperties[1] = System.IO.Path.GetDirectoryName(fullName);//解壓後放置的目標目錄
//   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
}
}