本文实例讲述了asp.net C#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:
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:来自网格<br>/// 修改人:sunkaixaun/// 压缩和解压文件 /// </summary> public class ZipClass{/// <summary> /// 所有文件缓存 /// </summary> List<string> files = new List<string>(); /// <summary> /// 所有空目录缓存 /// </summary> List<string> paths = new List<string>();/// <summary> /// 压缩单个文件根据文件地址/// </summary> /// <param name="fileToZip">要压缩的文件</param> /// <param name="zipedFile">压缩后的文件全名</param> /// <param name="compressionLevel">压缩程度,范围0-9,数值越大,压缩程序越高</param> /// <param name="blockSize">分块大小</param> public void ZipFile(string fileToZip, string zipedFile, int compressionLevel, int blockSize){if (!System.IO.File.Exists(fileToZip))//如果文件没有找到,则报错 {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> /// 压缩目录(包括子目录及所有文件) /// </summary> /// <param name="rootPath">要压缩的根目录</param> /// <param name="destinationPath">保存路径</param> /// <param name="compressLevel">压缩程度,范围0-9,数值越大,压缩程序越高</param> 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();}/// <summary> /// 多文件打包下载/// </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();}/// <summary> /// 取得目录下所有文件及文件夹,分别存入files及paths /// </summary> /// <param name="rootPath">根目录</param> 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 }}/// <summary> /// 解压缩文件(压缩文件中含有子目录) /// </summary> /// <param name="zipfilepath">待解压缩的文件路径</param> /// <param name="unzippath">解压缩到指定目录</param> /// <returns>解压后的文件列表</returns> public List<string> UnZip(string zipfilepath, string unzippath){//解压出来的文件列表 List<string> unzipFiles = new List<string>();//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;}}public class MyNameTransfom : ICSharpCode.SharpZipLib.Core.INameTransform{#region INameTransform 成员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内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。