ASP.NET实现文件的在线压缩自动解压
发布时间:2023-07-18 14:24:57 所属栏目:教程 来源:
导读:一个投票功能模块少不了查看投票结果,用进度条显示各个投票结果可以起到一目了然的效果。以下是我的方法,请大家不吝赐教:
(1)做一张图片用于做进度条,只需要很小的一个图片就可以了,如高20px,宽1px。
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(1)做一张图片用于做进度条,只需要很小的一个图片就可以了,如高20px,宽1px。
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一个投票功能模块少不了查看投票结果,用进度条显示各个投票结果可以起到一目了然的效果。以下是我的方法,请大家不吝赐教: (1)做一张图片用于做进度条,只需要很小的一个图片就可以了,如高20px,宽1px。 (2)在要显示进度条的单元格中插入image控件,其imageUrl设置为已做好的图片的位置。 (3)用一个dataReader对象dr保存取出的各项票数,用一个int 型变量sum保存取出的总票数,各项分别再定义一个double型变量用来保存单项票数除以(/)总票数的结果(小数),再定义一个int型的变量来保存最终要显示的进度条的长度(用前面那个double型变量*用来显示进度条的单元格的长度,然后强制转换为int型),将长度赋值给图片的width 属性即可,以下为我的代码片段,显示四个进度条: SqlCommand cmd=new SqlCommand("select * from TvoteNum order by Vid",con);//查出各项的投票结果的sql语句 SqlDataReader dr=cmd.ExecuteReader(); ...... SqlCommand cmd1=new SqlCommand("select sum(Vnum) from TvoteNum",con1);//查出总票数的sql语句 int sum=Convert.ToInt32(cmd1.ExecuteScalar()); ...... dr.Read();//读datareader对象的第一条记录 this.Label1.Text=dr.GetInt32(1).ToString();//第一项的票数 double w1=(Convert.ToDouble(this.Label1.Text)/sum);//此项票数占总票数的百分比 int wid1=(int)(w1*310);//转化为具体象素,310为要用来显示进度条的单元格长度 this.Image1.Width=wid1;//赋值给图片的宽度 dr.Read();//读第二条记录 this.Label2.Text=dr.GetInt32(1).ToString(); double w2=(Convert.ToDouble(this.Label2.Text)/sum); int wid2=(int)(w2*310); a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 { /// /// 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。 this.Image2.Width=wid2; dr.Read();//读第三条记录 this.Label3.Text=dr.GetInt32(1).ToString(); double w3=(Convert.ToDouble(this.Label3.Text)/sum);ASP.NET技巧:投票结果的图片进度条显示 int wid3=(int)(w3*310); this.Image3.Width=wid3; dr.Read();//读第四条记录 this.Label4.Text=dr.GetInt32(1).ToString(); double w4=(Convert.ToDouble(this.Label4.Text)/sum); int wid4=(int)(w4*310); this.Image4.Width=wid4; (编辑:汽车网) 【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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