asp.net C#实现解压缩文件的方法

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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。