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ASP.NET在线压缩和解压缩文件(带创建文件夹)

时间:2009-12-21 11:47来源:未知 作者:admin 点击:
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ASP。NET技术的斑竹给大家来了个服务器上传文件并创建文件夹的例子,我来个 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
ASP。NET技术的斑竹给大家来了个服务器上传文件并创建文件夹的例子,我来个用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
{
  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
  }
}
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