ASP.NET 文件壓縮解壓類(C#)
本文實(shí)例講述了asp.net C#實(shí)現(xiàn)解壓縮文件的方法,需要引用一個(gè)ICSharpCode.SharpZipLib.dll,供大家參考,具體如下:
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 { /// <summary> <br> /// 作者:來(lái)自網(wǎng)格<br> /// 修改人:sunkaixaun /// 壓縮和解壓文件 /// </summary> public class ZipClass { /// <summary> /// 所有文件緩存 /// </summary> List<string> files = new List<string>(); /// <summary> /// 所有空目錄緩存 /// </summary> List<string> paths = new List<string>(); /// <summary> /// 壓縮單個(gè)文件根據(jù)文件地址 /// </summary> /// <param name="fileToZip">要壓縮的文件</param> /// <param name="zipedFile">壓縮后的文件全名</param> /// <param name="compressionLevel">壓縮程度,范圍0-9,數(shù)值越大,壓縮程序越高</param> /// <param name="blockSize">分塊大小</param> public void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize) { if (!System.IO.File.Exists(fileToZip))//如果文件沒(méi)有找到,則報(bào)錯(cuò) { 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(); } /// <summary> /// 壓縮目錄(包括子目錄及所有文件) /// </summary> /// <param name="rootPath">要壓縮的根目錄</param> /// <param name="destinationPath">保存路徑</param> /// <param name="compressLevel">壓縮程度,范圍0-9,數(shù)值越大,壓縮程序越高</param> public void ZipFileFromDirectory(string rootPath, string destinationPath, int compressLevel) { GetAllDirectories(rootPath); /* while (rootPath.LastIndexOf("\\") + 1 == rootPath.Length)//檢查路徑是否以"\"結(jié)尾 { rootPath = rootPath.Substring(0, rootPath.Length - 1);//如果是則去掉末尾的"\" } */ //string rootMark = rootPath.Substring(0, rootPath.LastIndexOf("\\") + 1);//得到當(dāng)前路徑的位置,以備壓縮時(shí)將所壓縮內(nèi)容轉(zhuǎn)變成相對(duì)路徑。 string rootMark = rootPath + "\\";//得到當(dāng)前路徑的位置,以備壓縮時(shí)將所壓縮內(nèi)容轉(zhuǎn)變成相對(duì)路徑。 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);//打開(kāi)壓縮文件 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(); } /// <summary> /// 多文件打包下載 /// </summary> 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();//通過(guò)這個(gè)名稱格式化器,可以將里面的文件名進(jìn)行一些處理。默認(rèn)情況下,會(huì)自動(dòng)根據(jù)文件的路徑在zip中創(chuàng)建有關(guān)的文件夾。 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(); } /// <summary> /// 取得目錄下所有文件及文件夾,分別存入files及paths /// </summary> /// <param name="rootPath">根目錄</param> private void GetAllDirectories(string rootPath) { string[] subPaths = Directory.GetDirectories(rootPath);//得到所有子目錄 foreach (string path in subPaths) { GetAllDirectories(path);//對(duì)每一個(gè)字目錄做與根目錄相同的操作:即找到子目錄并將當(dāng)前目錄的文件名存入List } string[] files = Directory.GetFiles(rootPath); foreach (string file in files) { this.files.Add(file);//將當(dāng)前目錄中的所有文件全名存入文件List } if (subPaths.Length == files.Length && files.Length == 0)//如果是空目錄 { this.paths.Add(rootPath);//記錄空目錄 } } /// <summary> /// 解壓縮文件(壓縮文件中含有子目錄) /// </summary> /// <param name="zipfilepath">待解壓縮的文件路徑</param> /// <param name="unzippath">解壓縮到指定目錄</param> /// <returns>解壓后的文件列表</returns> public List<string> UnZip(string zipfilepath, string unzippath) { //解壓出來(lái)的文件列表 List<string> unzipFiles = new List<string>(); //檢查輸出目錄是否以“\\”結(jié)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); //生成解壓目錄【用戶解壓到硬盤(pán)根目錄時(shí),不需要?jiǎng)?chuàng)建】 if (!string.IsNullOrEmpty(directoryName)) { Directory.CreateDirectory(directoryName); } if (fileName != String.Empty) { //如果文件的壓縮后大小為0那么說(shuō)明這個(gè)文件是空的,因此不需要進(jìn)行讀出寫(xiě)入 if (theEntry.CompressedSize == 0) break; //解壓文件到指定的目錄 directoryName = Path.GetDirectoryName(unzippath + theEntry.Name); //建立下面的目錄和子目錄 Directory.CreateDirectory(directoryName); //記錄導(dǎo)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; } } public class MyNameTransfom : ICSharpCode.SharpZipLib.Core.INameTransform { #region INameTransform 成員 public string TransformDirectory(string name) { return null; } public string TransformFile(string name) { return Path.GetFileName(name); } #endregion } }
以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家?!?br />
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