ASP.NET 文件压缩解压类(C#)
本文实例讲述了asp.netC#实现解压缩文件的方法,需要引用一个ICSharpCode.SharpZipLib.dll,供大家参考,具体如下:
usingSystem; usingSystem.Collections.Generic; usingSystem.Linq; usingSystem.Text; usingICSharpCode.SharpZipLib.Zip; usingSystem.IO; usingICSharpCode.SharpZipLib.Checksums; usingSystem.Web; namespaceMvc51Hiring.Common.Tool { ///<summary><br>///作者:来自网格<br>///修改人:sunkaixaun ///压缩和解压文件 ///</summary> publicclassZipClass { ///<summary> ///所有文件缓存 ///</summary> List<string>files=newList<string>(); ///<summary> ///所有空目录缓存 ///</summary> List<string>paths=newList<string>(); ///<summary> ///压缩单个文件根据文件地址 ///</summary> ///<paramname="fileToZip">要压缩的文件</param> ///<paramname="zipedFile">压缩后的文件全名</param> ///<paramname="compressionLevel">压缩程度,范围0-9,数值越大,压缩程序越高</param> ///<paramname="blockSize">分块大小</param> publicvoidZipFile(stringfileToZip,stringzipedFile,intcompressionLevel,intblockSize) { if(!System.IO.File.Exists(fileToZip))//如果文件没有找到,则报错 { thrownewFileNotFoundException("Thespecifiedfile"+fileToZip+"couldnotbefound.Zippingaborderd"); } FileStreamstreamToZip=newFileStream(fileToZip,FileMode.Open,FileAccess.Read); FileStreamzipFile=File.Create(zipedFile); ZipOutputStreamzipStream=newZipOutputStream(zipFile); ZipEntryzipEntry=newZipEntry(fileToZip); zipStream.PutNextEntry(zipEntry); zipStream.SetLevel(compressionLevel); byte[]buffer=newbyte[blockSize]; intsize=streamToZip.Read(buffer,0,buffer.Length); zipStream.Write(buffer,0,size); try { while(size<streamToZip.Length) { intsizeRead=streamToZip.Read(buffer,0,buffer.Length); zipStream.Write(buffer,0,sizeRead); size+=sizeRead; } } catch(Exceptionex) { GC.Collect(); throwex; } zipStream.Finish(); zipStream.Close(); streamToZip.Close(); GC.Collect(); } ///<summary> ///压缩目录(包括子目录及所有文件) ///</summary> ///<paramname="rootPath">要压缩的根目录</param> ///<paramname="destinationPath">保存路径</param> ///<paramname="compressLevel">压缩程度,范围0-9,数值越大,压缩程序越高</param> publicvoidZipFileFromDirectory(stringrootPath,stringdestinationPath,intcompressLevel) { 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"\" } */ //stringrootMark=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。 stringrootMark=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。 Crc32crc=newCrc32(); ZipOutputStreamoutPutStream=newZipOutputStream(File.Create(destinationPath)); outPutStream.SetLevel(compressLevel);//0-storeonlyto9-meansbestcompression foreach(stringfileinfiles) { FileStreamfileStream=File.OpenRead(file);//打开压缩文件 byte[]buffer=newbyte[fileStream.Length]; fileStream.Read(buffer,0,buffer.Length); ZipEntryentry=newZipEntry(file.Replace(rootMark,string.Empty)); entry.DateTime=DateTime.Now; //setSizeandthecrc,becausetheinformation //aboutthesizeandcrcshouldbestoredintheheader //ifitisnotsetitisautomaticallywritteninthefooter. //(inthiscasesize==crc==-1intheheader) //SomeZIPprogramshaveproblemswithzipfilesthatdon'tstore //thesizeandcrcintheheader. 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(stringemptyPathinpaths) { ZipEntryentry=newZipEntry(emptyPath.Replace(rootMark,string.Empty)+"/"); outPutStream.PutNextEntry(entry); } this.paths.Clear(); outPutStream.Finish(); outPutStream.Close(); GC.Collect(); } ///<summary> ///多文件打包下载 ///</summary> publicvoidDwonloadZip(string[]filePathList,stringzipName) { MemoryStreamms=newMemoryStream(); byte[]buffer=null; varcontext=HttpContext.Current; using(ICSharpCode.SharpZipLib.Zip.ZipFilefile=ICSharpCode.SharpZipLib.Zip.ZipFile.Create(ms)) { file.BeginUpdate(); file.NameTransform=newMyNameTransfom();//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(varitinfilePathList) { file.Add(context.Server.MapPath(it)); } file.CommitUpdate(); buffer=newbyte[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> ///取得目录下所有文件及文件夹,分别存入files及paths ///</summary> ///<paramname="rootPath">根目录</param> privatevoidGetAllDirectories(stringrootPath) { string[]subPaths=Directory.GetDirectories(rootPath);//得到所有子目录 foreach(stringpathinsubPaths) { 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(stringfileinfiles) { 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 } } ///<summary> ///解压缩文件(压缩文件中含有子目录) ///</summary> ///<paramname="zipfilepath">待解压缩的文件路径</param> ///<paramname="unzippath">解压缩到指定目录</param> ///<returns>解压后的文件列表</returns> publicList<string>UnZip(stringzipfilepath,stringunzippath) { //解压出来的文件列表 List<string>unzipFiles=newList<string>(); //检查输出目录是否以“\\”结尾 if(unzippath.EndsWith("\\")==false||unzippath.EndsWith(":\\")==false) { unzippath+="\\"; } ZipInputStreams=newZipInputStream(File.OpenRead(zipfilepath)); ZipEntrytheEntry; while((theEntry=s.GetNextEntry())!=null) { stringdirectoryName=Path.GetDirectoryName(unzippath); stringfileName=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); FileStreamstreamWriter=File.Create(unzippath+theEntry.Name); intsize=2048; byte[]data=newbyte[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(); returnunzipFiles; } } publicclassMyNameTransfom:ICSharpCode.SharpZipLib.Core.INameTransform { #regionINameTransform成员 publicstringTransformDirectory(stringname) { returnnull; } publicstringTransformFile(stringname) { returnPath.GetFileName(name); } #endregion } }
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