用ASP.NET实现文件的在线压缩和解压缩
发布时间：2022-10-18 12:39:03 所属栏目：Asp教程 来源：
导读： 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
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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asp压缩，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 } } 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。 （编辑：拼字网 - 核心网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
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