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。

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("\")+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" %> 

//-------------------------------------------

// 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。