C# 文件压缩

using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Collections.Generic;using System.IO;using ICSharpCode.SharpZipLib.Zip;using ICSharpCode.SharpZipLib.Checksums;/// <summary>/// ZipClass 的摘要说明/// </summary>//.net 删除文件夹  HttpModules web.config//[Serializable]public class ZipClass{    public ZipClass()    {        //        // TODO: 在此处添加构造函数逻辑        //    }    List<string> files = new List<string>();    List<string> paths = new List<string>();    ///  <summary>          /// 压缩单个文件          ///  </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>  Util.ZipClass rar = new Util.ZipClass();    /// rar.ZipFileFromDirectory("F:/NatureStudentData/s07", "F:/NatureStudentData/rar.rar", 0);        ///  <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>          /// 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;    } }

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