ASP.Net实现在线压缩和解压缩




  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inRelease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
// ———————————————
<%@ 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 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: esta.txt
string destPath=System.IO.Path.GetDirectoryName(fullName);//C: est
//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: esta.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,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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