用ASP.Net实现在线压缩和解压缩

欢迎您访问我爱IT技术网，今天小编为你分享的编程技术是：【用ASP.Net实现在线压缩和解压缩】，下面是详细的分享！

用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\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" %> <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> /// 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，没有时间解决了，各位如有解决方案，不妨共享一下

以上所分享的是关于用ASP.Net实现在线压缩和解压缩，下面是编辑为你推荐的有价值的用户互动：

　　相关问题：ASP/ASP.Net 在线解压缩压缩包

　　答：直接运行step.exe >>详细

　　相关问题：asp.net(c#) 有了压缩文件怎么实现解压文件 zip

　　答：http://pan.baidu.com/s/1qW6kW80 你下载一下这个吧，有压缩和解压的。 里面的类比较详细。 >>详细

　　相关问题：怎样用java编写一个程序实现把文件压缩和解压缩

　　答：使用java.util.zip.ZipFile 类及相关的类实现 >>详细