asp.net C#压缩打包文件例子

 /// <summary>
/// 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
    /// </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>
    /// 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;
    }
}