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asp.net C#实现解压缩文件的方法

时间：2021-11-14 11:31 编辑：来源：阅读：
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摘要：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：

[url=http://xiazai.1sucai.cn/201411/yuanma/icsharpcode-SharpZipLib-c49a22d(1sucai.cn).zip]本站下载[/url]。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

[u]复制代码[/u] 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);

            }

        }

    }

}

[u]复制代码[/u] 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

[u]复制代码[/u] 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:zipa.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:zipb.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。

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