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    ASP.NET 文件压缩解压类(C#)

    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> 
        Liststring> files = new Liststring>();
     
        /// summary> 
        /// 所有空目录缓存 
        /// /summary> 
        Liststring> paths = new Liststring>();
    
        /// 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 Liststring> UnZip(string zipfilepath, string unzippath)
    
        {
          //解压出来的文件列表 
    
          Liststring> unzipFiles = new Liststring>();
          //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。 

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