asp.net C#实现解压缩文件的方法

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 ( );

            }

}

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;

        }

    }

}

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);
            }
        }
    }
}

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;
        }
    }  
}

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]);

}