asp.net C#实现解压缩文件的方法

  本文实例讲述了asp.net C#实现解压缩文件的方法。一共给大家介绍了三段代码,一个是简单的解压缩单个zip文件,后一个可以解压批量的大量的但需要调用ICSharpCode.SharpZipLib.dll类了,最后一个比较实例可压缩也可以解压缩了分享给大家供大家参考。具体如下:

  解压缩单个文件:

  

复制代码 代码如下:
using System.IO;

  using System.IO.Compression;

  string sourceFile=@"D:2.zip";

  string destinationFile=@"D:1.txt";

  private const long BUFFER_SIZE = 20480;

  // make sure the source file is there

  if (File.Exists ( sourceFile ))

  {

  FileStream sourceStream = null;

  FileStream destinationStream = null;

  GZipStream decompressedStream = null;

  byte[] quartetBuffer = null;

  try

  {

  // Read in the compressed source stream

  sourceStream = new FileStream ( sourceFile, FileMode.Open );

  // Create a compression stream pointing to the destiantion stream

  decompressedStream = new DeflateStream ( sourceStream, CompressionMode.Decompress, true );

  // Read the footer to determine the length of the destiantion file

  quartetBuffer = new byte[4];

  int position = (int)sourceStream.Length - 4;

  sourceStream.Position = position;

  sourceStream.Read ( quartetBuffer, 0, 4 );

  sourceStream.Position = 0;

  int checkLength = BitConverter.ToInt32 ( quartetBuffer, 0 );

  byte[] buffer = new byte[checkLength + 100];

  int offset = 0;

  int total = 0;

  // Read the compressed data into the buffer

  while ( true )

  {

  int bytesRead = decompressedStream.Read ( buffer, offset, 100 );

  if ( bytesRead == 0 )

  break;

  offset += bytesRead;

  total += bytesRead;

  }

  // Now write everything to the destination file

  destinationStream = new FileStream ( destinationFile, FileMode.Create );

  destinationStream.Write ( buffer, 0, total );

  // and flush everyhting to clean out the buffer

  destinationStream.Flush ( );

  }

  catch ( ApplicationException ex )

  {

  Console.WriteLine(ex.Message, "解压文件时发生错误:");

  }

  finally

  {

  // Make sure we allways close all streams

  if ( sourceStream != null )

  sourceStream.Close ( );

  if ( decompressedStream != null )

  decompressedStream.Close ( );

  if ( destinationStream != null )

  destinationStream.Close ( );

  }

  }

  批量解压缩(这需要调用一个解压缩类库。。 ICSharpCode.SharpZipLib.dll)

  

复制代码 代码如下:
using System;

  using System.IO;

  using System.Collections.Generic;

  using System.Text;

  using ICSharpCode.SharpZipLib.Zip;

  namespace ZipLib

  {

  /// <summary>

  /// 解压缩类

  /// </summary>

  public static class ZIP

  {

  /// <summary>

  /// 解压ZIP文件包

  /// </summary>

  /// <param name="strZipFile">ZIP文件路径</param>

  /// <param name="strDir">解压后的文件目录路径</param>

  /// <returns>是否解压成功</returns>

  public static bool unzipFiles(string strZipFile, string strDir)

  {

  //判断ZIP文件是否存在

  if (File.Exists(strZipFile))

  {

  //判断目录是否存在

  bool bUnzipDir = false;

  //判断是否需要创建目录

  if (!Directory.Exists(strDir))

  bUnzipDir = (Directory.CreateDirectory(strDir) != null);

  else

  bUnzipDir = true;

  //如果解压目录存在

  if (bUnzipDir)

  {

  //获得ZIP数据流

  ZipInputStream zipStream = new ZipInputStream(File.OpenRead(strZipFile));

  if (zipStream != null)

  {

  ZipEntry zipEntry = null;

  while ((zipEntry = zipStream.GetNextEntry()) != null)

  {

  string strUnzipFile = strDir + "//" + zipEntry.Name;

  string strFileName = Path.GetFileName(strUnzipFile);

  string strDirName = Path.GetDirectoryName(strUnzipFile);

  //是否为解压目录

  if (!string.IsNullOrEmpty(strDirName))

  Directory.CreateDirectory(strDirName);

  //是否为解压文件

  if (!string.IsNullOrEmpty(strFileName))

  {

  //解压文件

  FileStream unzipFileStream = new FileStream(strUnzipFile, FileMode.Create);

  if (unzipFileStream != null)

  {

  byte[] buf = new byte[2048];

  int size = 0;

  while ((size = zipStream.Read(buf, 0, 2048)) > 0)

  unzipFileStream.Write(buf, 0, size);

  //关闭Stream

  unzipFileStream.Flush();

  unzipFileStream.Close();

  }

  }

  }

  //关闭ZIP流

  zipStream.Close();

  //返回值

  return true;

  }

  }

  }

  return false;

  }

  }

  }

  上面两个都是解压缩文件,下面我们把压缩与解压缩放在一个实例中。

  最近要做一个项目涉及到C#中压缩与解压缩的问题的解决方法,大家分享。

  这里主要解决文件夹包含文件夹的解压缩问题。

  下载SharpZipLib.dll,在http://www.icsharpcode.net/OpenSource/SharpZipLib/Download.aspx中有最新免费版本,“Assemblies for .NET 1.1, .NET 2.0, .NET CF 1.0, .NET CF 2.0: Download [297 KB] ”点击Download可以下载,解压后里边有好多文件夹,因为不同的版本,我用的FW2.0。

  或者点击此处本站下载

  引用SharpZipLib.dll,在项目中点击项目右键-->添加引用-->浏览,找到要添加的DLL-->确认

  改写了文件压缩和解压缩的两个类,新建两个类名字为ZipFloClass.cs,UnZipFloClass.cs

  源码如下

  

复制代码 代码如下:
using System;

  using System.Data;

  using System.Configuration;

  using System.Web;

  using System.Web.Security;

  using System.Web.UI;

  using System.IO;

  using ICSharpCode.SharpZipLib.Checksums;

  using ICSharpCode.SharpZipLib.Zip;

  using ICSharpCode.SharpZipLib.GZip;

  /// <summary>

  /// ZipFloClass 的摘要说明

  /// </summary>

  public class ZipFloClass

  {

  public void ZipFile(string strFile, string strZip)

  {

  if (strFile[strFile.Length - 1] != Path.DirectorySeparatorChar)

  strFile += Path.DirectorySeparatorChar;

  ZipOutputStream s = new ZipOutputStream(File.Create(strZip));

  s.SetLevel(6); // 0 - store only to 9 - means best compression

  zip(strFile, s, strFile);

  s.Finish();

  s.Close();

  }

  private void zip(string strFile, ZipOutputStream s, string staticFile)

  {

  if (strFile[strFile.Length - 1] != Path.DirectorySeparatorChar) strFile += Path.DirectorySeparatorChar;

  Crc32 crc = new Crc32();

  string[] filenames = Directory.GetFileSystemEntries(strFile);

  foreach (string file in filenames)

  {

  if (Directory.Exists(file))

  {

  zip(file, s, staticFile);

  }

  else // 否则直接压缩文件

  {

  //打开压缩文件

  FileStream fs = File.OpenRead(file);

  byte[] buffer = new byte[fs.Length];

  fs.Read(buffer, 0, buffer.Length);

  string tempfile = file.Substring(staticFile.LastIndexOf("\") + 1);

  ZipEntry entry = new ZipEntry(tempfile);

  entry.DateTime = DateTime.Now;

  entry.Size = fs.Length;

  fs.Close();

  crc.Reset();

  crc.Update(buffer);

  entry.Crc = crc.Value;

  s.PutNextEntry(entry);

  s.Write(buffer, 0, buffer.Length);

  }

  }

  }

  }

  

复制代码 代码如下:
using System;

  using System.Data;

  using System.Web;

  using System.Text;

  using System.Collections;

  using System.IO;

  using System.Diagnostics;

  using System.Runtime.Serialization.Formatters.Binary;

  using ICSharpCode.SharpZipLib.BZip2;

  using ICSharpCode.SharpZipLib.Zip;

  using ICSharpCode.SharpZipLib.Zip.Compression;

  using ICSharpCode.SharpZipLib.Zip.Compression.Streams;

  using ICSharpCode.SharpZipLib.GZip;

  using ICSharpCode.SharpZipLib.Checksums;

  /// <summary>

  /// UnZipFloClass 的摘要说明

  /// </summary>

  public class UnZipFloClass

  {

  public string unZipFile(string TargetFile, string fileDir)

  {

  string rootFile = " ";

  try

  {

  //读取压缩文件(zip文件),准备解压缩

  ZipInputStream s = new ZipInputStream(File.OpenRead(TargetFile.Trim()));

  ZipEntry theEntry;

  string path = fileDir;

  //解压出来的文件保存的路径

  string rootDir = " ";

  //根目录下的第一个子文件夹的名称

  while ((theEntry = s.GetNextEntry()) != null)

  {

  rootDir = Path.GetDirectoryName(theEntry.Name);

  //得到根目录下的第一级子文件夹的名称

  if (rootDir.IndexOf("\") >= 0)

  {

  rootDir = rootDir.Substring(0, rootDir.IndexOf("\") + 1);

  }

  string dir = Path.GetDirectoryName(theEntry.Name);

  //根目录下的第一级子文件夹的下的文件夹的名称

  string fileName = Path.GetFileName(theEntry.Name);

  //根目录下的文件名称

  if (dir != " " )

  //创建根目录下的子文件夹,不限制级别

  {

  if (!Directory.Exists(fileDir + "\" + dir))

  {

  path = fileDir + "\" + dir;

  //在指定的路径创建文件夹

  Directory.CreateDirectory(path);

  }

  }

  else if (dir == " " && fileName != "")

  //根目录下的文件

  {

  path = fileDir;

  rootFile = fileName;

  }

  else if (dir != " " && fileName != "")

  //根目录下的第一级子文件夹下的文件

  {

  if (dir.IndexOf("\") > 0)

  //指定文件保存的路径

  {

  path = fileDir + "\" + dir;

  }

  }

  if (dir == rootDir)

  //判断是不是需要保存在根目录下的文件

  {

  path = fileDir + "\" + rootDir;

  }

  //以下为解压缩zip文件的基本步骤

  //基本思路就是遍历压缩文件里的所有文件,创建一个相同的文件。

  if (fileName != String.Empty)

  {

  FileStream streamWriter = File.Create(path + "\" + fileName);

  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();

  return rootFile;

  }

  catch (Exception ex)

  {

  return "1; " + ex.Message;

  }

  }

  }

  引用,新建一个页面,添加两个按钮,为按钮添加Click事件

  源码如下

  

复制代码 代码如下:
protected void Button1_Click(object sender, EventArgs e)

  {

  string[] FileProperties = new string[2];

  FileProperties[0] = "D:\unzipped\";//待压缩文件目录

  FileProperties[1] = "D:\zip\a.zip";  //压缩后的目标文件

  ZipFloClass Zc = new ZipFloClass();

  Zc.ZipFile(FileProperties[0], FileProperties[1]);

  }

  protected void Button2_Click(object sender, EventArgs e)

  {

  string[] FileProperties = new string[2];

  FileProperties[0] = "D:\zip\b.zip";//待解压的文件

  FileProperties[1] = "D:\unzipped\";//解压后放置的目标目录

  UnZipFloClass UnZc = new UnZipFloClass();

  UnZc.unZipFile(FileProperties[0], FileProperties[1]);

  }

  希望本文所述对大家的asp.net程序设计有所帮助。