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>      /// 作者：来自网格    /// 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}
}