ASP.NET如何实现文件压缩解压类

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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{  /// 
 
  /// 作者：来自网格
  /// 修改人:sunkaixaun  /// 压缩和解压文件   /// 
   public class ZipClass  {    /// 
     /// 所有文件缓存     /// 
     List files = new List();     /// 
     /// 所有空目录缓存     /// 
     List paths = new List();    /// 
     /// 压缩单个文件根据文件地址    /// 
     /// 要压缩的文件     /// 压缩后的文件全名     /// 压缩程度，范围0-9，数值越大，压缩程序越高     /// 分块大小     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();    }    /// 
     /// 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;    }  }  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  }}

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