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用SharpZipLib来压缩和解压文件

2007-01-07 10:51 423 查看

1.建立工程，添加引用，添加SharpZipLib.dll
2.建立压缩和解压类CompressionFile.cs
添加如下代码

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 WebApplication3

{

ZipClass 压缩文件#region ZipClass 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.FileNotFoundExcep
4000
tion("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();

}

#endregion

UnZipClass 解压文件#region UnZipClass 解压文件

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

}//end UnZipClass

#endregion

AttachmentUnZip#region AttachmentUnZip

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);

}

#endregion

}
3.建立测试页面
3.1html

<HTML>

<HEAD>

<title>WebForm1</title>

</HEAD>

<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>
3.2 cs代码

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

}

Web Form Designer generated code#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

压缩#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

解压#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);

}

#endregion

}
4.源代码下载/Files/singlepine/zipunzip.rar

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