How to realize File Compression and decompression Class by ASP.NET
The details are as follows:
Using System;using System.Collections.Generic;using System.Linq;using System.Text;using ICSharpCode.SharpZipLib.Zip;using System.IO;using ICSharpCode.SharpZipLib.Checksums;using System.Web;namespace Mvc51Hiring.Common.Tool {/
/ / author: from Grid
/ modifier: sunkaixaun / compress and extract files / public class ZipClass {/ all file caches / List files = new List (); / all empty directory caches / List paths = new List () / / compress a single file according to the file address / the full name of the compressed file / / the degree of compression, the range is 0-9, the higher the value. The higher the compression program, the higher the public void ZipFile (string fileToZip, string zipedFile, int compressionLevel, int blockSize) {if (! System.IO.File.Exists (fileToZip)) / / if the file is not found, the error {throw new FileNotFoundException ("The specified file" + fileToZip + "could not be found. Zipping aborderd ");} FileStream streamToZip = new FileStream (fileToZip, FileMode.Open, FileAccess.Read); FileStream zipFile = File.Create (zipedFile); ZipOutputStream zipStream = new ZipOutputStream (zipFile); ZipEntry zipEntry = new ZipEntry (fileToZip); zipStream.PutNextEntry (zipEntry); zipStream.SetLevel (compressionLevel); byte [] buffer = new byte [blockSize]; int 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 (Exception ex) { GC.Collect(); throw ex; } zipStream.Finish(); zipStream.Close(); streamToZip.Close(); GC.Collect(); } /// /// 压缩目录（包括子目录及所有文件） /// /// 要压缩的根目录 /// 保存路径 /// 压缩程度，范围0-9，数值越大，压缩程序越高 public void ZipFileFromDirectory(string rootPath, string destinationPath, int compressLevel) { GetAllDirectories(rootPath); /* while (rootPath.LastIndexOf("\\") + 1 == rootPath.Length)//检查路径是否以"\"结尾 { rootPath = rootPath.Substring(0, rootPath.Length - 1);//如果是则去掉末尾的"\" } */ //string rootMark = rootPath.Substring(0, rootPath.LastIndexOf("\\") + 1);//得到当前路径的位置，以备压缩时将所压缩内容转变成相对路径。 string rootMark = rootPath + "\\";//得到当前路径的位置，以备压缩时将所压缩内容转变成相对路径。 Crc32 crc = new Crc32(); ZipOutputStream outPutStream = new ZipOutputStream(File.Create(destinationPath)); outPutStream.SetLevel(compressLevel); // 0 - store only to 9 - means best compression foreach (string file in files) { FileStream fileStream = File.OpenRead(file);//打开压缩文件 byte[] buffer = new byte[fileStream.Length]; fileStream.Read(buffer, 0, buffer.Length); ZipEntry entry = new ZipEntry(file.Replace(rootMark, string.Empty)); 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 = fileStream.Length; fileStream.Close(); crc.Reset(); crc.Update(buffer); entry.Crc = crc.Value; outPutStream.PutNextEntry(entry); outPutStream.Write(buffer, 0, buffer.Length); } this.files.Clear(); foreach (string emptyPath in paths) { ZipEntry entry = new ZipEntry(emptyPath.Replace(rootMark, string.Empty) + "/"); outPutStream.PutNextEntry(entry); } this.paths.Clear(); outPutStream.Finish(); outPutStream.Close(); GC.Collect(); } /// /// 多文件打包下载 /// public void DwonloadZip(string[] filePathList, string zipName) { MemoryStream ms = new MemoryStream(); byte[] buffer = null; var context = HttpContext.Current; using (ICSharpCode.SharpZipLib.Zip.ZipFile file = ICSharpCode.SharpZipLib.Zip.ZipFile.Create(ms)) { file.BeginUpdate(); file.NameTransform = new MyNameTransfom();//通过这个名称格式化器，可以将里面的文件名进行一些处理。默认情况下，会自动根据文件的路径在zip中创建有关的文件夹。 foreach (var it in filePathList) { file.Add(context.Server.MapPath(it)); } file.CommitUpdate(); buffer = new byte[ms.Length]; ms.Position = 0; ms.Read(buffer, 0, buffer.Length); } context.Response.AddHeader("content-disposition", "attachment;filename=" + zipName); context.Response.BinaryWrite(buffer); context.Response.Flush(); context.Response.End(); } /// /// 取得目录下所有文件及文件夹，分别存入files及paths /// /// 根目录 private void GetAllDirectories(string rootPath) { string[] subPaths = Directory.GetDirectories(rootPath);//得到所有子目录 foreach (string path in subPaths) { GetAllDirectories(path);//对每一个字目录做与根目录相同的操作：即找到子目录并将当前目录的文件名存入List } string[] files = Directory.GetFiles(rootPath); foreach (string file in files) { this.files.Add(file);//将当前目录中的所有文件全名存入文件List } if (subPaths.Length == files.Length && files.Length == 0)//如果是空目录 { this.paths.Add(rootPath);//记录空目录 } } /// /// 解压缩文件(压缩文件中含有子目录) /// /// 待解压缩的文件路径 /// 解压缩到指定目录 /// 解压后的文件列表 public List UnZip(string zipfilepath, string unzippath) { //解压出来的文件列表 List unzipFiles = new List(); //检查输出目录是否以"\\"结尾 if (unzippath.EndsWith("\\") == false || unzippath.EndsWith(":\\") == false) { unzippath += "\\"; } ZipInputStream s = new ZipInputStream(File.OpenRead(zipfilepath)); ZipEntry theEntry; while ((theEntry = s.GetNextEntry()) != null) { string directoryName = Path.GetDirectoryName(unzippath); string fileName = Path.GetFileName(theEntry.Name); //生成解压目录【用户解压到硬盘根目录时，不需要创建】 if (!string.IsNullOrEmpty(directoryName)) { Directory.CreateDirectory(directoryName); } if (fileName != String.Empty) { //如果文件的压缩后大小为0那么说明这个文件是空的,因此不需要进行读出写入 if (theEntry.CompressedSize == 0) break; //解压文件到指定的目录 directoryName = Path.GetDirectoryName(unzippath + theEntry.Name); //建立下面的目录和子目录 Directory.CreateDirectory(directoryName); //记录导出的文件 unzipFiles.Add(unzippath + theEntry.Name); FileStream streamWriter = File.Create(unzippath + 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 (); GC.Collect (); return unzipFiles I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!
