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asp.net的文件压缩、解压、下载

1.先要从网上下载一个icsharpcode.sharpziplib.dll

2.建立类AttachmentUnZip，内容如下：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.GZip;
using ICSharpCode.SharpZipLib.BZip2;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip.Compression;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
/// <summary>
///UnZipClass 的摘要说明
/// </summary>
public class UnZipClass
{
    public UnZipClass()
    {
        //
        //TODO: 在此处添加构造函数逻辑
        //
    }
    /// <summary>
    /// 解压文件
    /// </summary>
    /// <param name="args">包含要解压的文件名和要解压到的目录名数组</param>
    public void UnZip(string[] args)
    {
        ZipInputStream s = new ZipInputStream(File.OpenRead(args[0]));
        try
        {
            ZipEntry theEntry;
            while ((theEntry = s.GetNextEntry()) != null)
            {
                string directoryName = Path.GetDirectoryName(args[1]);
                string fileName = Path.GetFileName(theEntry.Name);

                //生成解压目录
                Directory.CreateDirectory(directoryName);

                if (fileName != String.Empty)
                {
                    //解压文件到指定的目录
                    FileStream streamWriter = File.Create(args[1] + 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();
        }
        catch (Exception eu)
        {
            throw eu;
        }
        finally
        {
            s.Close();
        }

    }//end UnZip

    public static bool UnZipFile(string file, string dir)
    {
        try
        {
            if (!Directory.Exists(dir))
                Directory.CreateDirectory(dir);
            string fileFullName = Path.Combine(dir, file);
            ZipInputStream s = new ZipInputStream(File.OpenRead(fileFullName));

            ZipEntry theEntry;
            while ((theEntry = s.GetNextEntry()) != null)
            {
                string directoryName = Path.GetDirectoryName(theEntry.Name);
                string fileName = Path.GetFileName(theEntry.Name);

                if (directoryName != String.Empty)
                    Directory.CreateDirectory(Path.Combine(dir, directoryName));

                if (fileName != String.Empty)
                {
                    FileStream streamWriter = File.Create(Path.Combine(dir, 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();
            return true;
        }
        catch (Exception)
        {
            throw;
        }
    }

}
4.建立类ZipClass，内容如下：

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.IO;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.GZip;
using ICSharpCode.SharpZipLib.BZip2;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip.Compression;
using ICSharpCode.SharpZipLib.Zip.Compression.Streams;
/// <summary>
///ZipClass 的摘要说明
/// </summary>
public class ZipClass
{
    public ZipClass()
    {
        //
        //TODO: 在此处添加构造函数逻辑
        //
    }
    public void ZipFile(string FileToZip, string ZipedFile, int CompressionLevel, int BlockSize, string password)
    {
        //如果文件没有找到，则报错
        if (!System.IO.File.Exists(FileToZip))
        {
            throw new System.IO.FileNotFoundException("The specified file " + FileToZip + " could not be found. Zipping aborderd");
        }

        System.IO.FileStream StreamToZip = new System.IO.FileStream(FileToZip, System.IO.FileMode.Open, System.IO.FileAccess.Read);
        System.IO.FileStream ZipFile = System.IO.File.Create(ZipedFile);
        ZipOutputStream ZipStream = new ZipOutputStream(ZipFile);
        ZipEntry ZipEntry = new ZipEntry("ZippedFile");
        ZipStream.PutNextEntry(ZipEntry);
        ZipStream.SetLevel(CompressionLevel);
        byte[] buffer = new byte[BlockSize];
        System.Int32 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 (System.Exception ex)
        {
            throw ex;
        }
        ZipStream.Finish();
        ZipStream.Close();
        StreamToZip.Close();
    }

    public void ZipFileMain(string[] args)
    {
        //string[] filenames = Directory.GetFiles(args[0]);
        string[] filenames = new string[] { args[0] };

        Crc32 crc = new Crc32();
        ZipOutputStream s = new ZipOutputStream(File.Create(args[1]));

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

        foreach (string file in filenames)
        {
            //打开压缩文件
            FileStream fs = File.OpenRead(file);
            byte[] buffer = new byte[fs.Length];
            fs.Read(buffer, 0, buffer.Length);
            ZipEntry entry = new ZipEntry(file);
            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 = fs.Length;
            fs.Close();

            crc.Reset();
            crc.Update(buffer);

            entry.Crc = crc.Value;

            s.PutNextEntry(entry);

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

        }
        s.Finish();
        s.Close();
    }
}
5.类建好了，接下来建立测试页了。呵呵~~EcodeZipRar.aspx,哦，对了，忘了说了，我还在网站外层目录下建了一个文件夹FileZip，用来存放文件的。

前台页面显示：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="EcodeZipRar.aspx.cs" Inherits="EcodeZipRar" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    添加要压缩的文件：<asp:fileupload ID="Fileupload1" runat="server"></asp:fileupload>
        <br />
        <asp:Button ID="Button1" runat="server" Text="上传文件" onclick="Button1_Click" />//对于Fileupload1操作的
        <asp:Button ID="Button2" runat="server" onclick="Button2_Click1" Text="开始解压" />//对于Fileupload1操作的
        <asp:Button ID="Button3" runat="server" Text="文件下载" onclick="Button3_Click" /><br />//对于TreeView1操作的
        <asp:TreeView ID="TreeView1" runat="server" ShowCheckBoxes="All">//显示文件夹下的所有文件
        </asp:TreeView>
    </div>
    </form>
</body>
</html>

后台代码操作：

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Text;
using System.IO;
using ICSharpCode.SharpZipLib.Checksums;
using ICSharpCode.SharpZipLib.Zip;
using ICSharpCode.SharpZipLib.GZip;
using System.Runtime.InteropServices;
using Microsoft.Win32;
using System.Diagnostics;
public partial class EcodeZipRar : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        List();
    }
    //实现文件压缩
    protected void Button1_Click(object sender, EventArgs e)
    {
        string[] FileProperties = new string[2];
        string fullName = Fileupload1.PostedFile.FileName;//C:/test/a.txt
        //待压缩文件
        FileProperties[0] = fullName;
        string format = Path.GetExtension(fullName);//文件格式
        string[] type = { ".zip", ".rar" };
        bool isZip = true;//指定文件是否需要压缩
        foreach (string types in type)
        {
            if (format == types)
            {
                isZip = false;
                break;
            }
        }
        string newPath = HttpContext.Current.Server.MapPath("~/FileZip/") + Fileupload1.FileName;
        try
        {
            Fileupload1.SaveAs(newPath);
            if (isZip)
            {
                FileProperties[1] = HttpContext.Current.Server.MapPath("~/FileZip/") + System.IO.Path.GetFileNameWithoutExtension(fullName) + ".zip";
                //如果文件已经存在，则删除原来的文件
                if(File.Exists(FileProperties[1]))
                {
                    File.Delete(FileProperties[1]);
                }
                //压缩后的目标文件
                ZipClass Zc = new ZipClass();
                Zc.ZipFileMain(FileProperties);
                File.Delete(HttpContext.Current.Server.MapPath("~/FileZip/") + Fileupload1.FileName);//删除原始文件
            }
            List();
            Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('文件上传成功！')</script>");
        }
        catch
        {
            Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('文件上传失败！')</script>");
        }

    }
//文件解压
       protected void Button2_Click1(object sender, EventArgs e)
       {
           string fullName = Fileupload1.PostedFile.FileName; ;//C:/test/a.zip
           string format = Path.GetExtension(fullName);//文件格式
           string[] type = { ".zip"};
           bool isUnZip =false;//指定文件是否需要解压
           foreach (string types in type)
           {
               if (format == types)
               {
                   isUnZip = true;
                   break;
               }
           }
           if (isUnZip)
           {
               //解压文件
               AttachmentUnZip.UpZip(fullName);
               string[] FileProperties = new string[2];
               FileProperties[0] = fullName;//待解压的文件
               FileProperties[1] = System.IO.Path.GetDirectoryName(fullName);//解压后放置的目标目录
               UnZipClass UnZc = new UnZipClass();
               try
               {
                   UnZc.UnZip(FileProperties);
                   List();
                   Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('文件解压成功！')</script>");
               }
               catch
               {
                   Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('文件解压失败！')</script>");
               }
           }
           else
           {
               Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('解压文件格式为zip！')</script>");
           }

       }
    //获取指定目录下的所有文件
       protected void List()
       {
           TreeView1.Nodes.Clear();
           string[] files = Directory.GetFiles(HttpContext.Current.Server.MapPath("~/FileZip/"));
           foreach (string file in files)
           {
               TreeNode node = new TreeNode();
               node.Text = file;
               TreeView1.Nodes.Add(node);
           }
       }
    //文件下载
       protected void Button3_Click(object sender, EventArgs e)
       {
           foreach (TreeNode node in TreeView1.Nodes)
           {
               if (node.Checked)
               {
                   string path = node.Text;
                   string fileName = Path.GetFileName(path);
                   DownLoad(fileName, path);
               }
           }
       }
       /*
            微软为Response对象提供了一个新的方法TransmitFile来解决使用 Response.BinaryWrite下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
      代码如下：
      */
    /// <summary>
    ///
    /// </summary>
    /// <param name="fileName">所下载的文件名</param>
    /// <param name="path">所下载的文件路径</param>
       protected void DownLoad(string fileName, string path)
       {
           try
           {
               Response.ContentType = "application/x-zip-compressed";
               Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName + "");
               string file = Server.MapPath(path);
               Response.TransmitFile(file);
           }
           catch
           {
               Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "success", "<script>alert('文件下载失败！')</script>");
           }
       }

}
呵呵，就这样了，暂时没用多线程的，不知道很多人同时下载或上传会不会有影响呢？多线程可以解决问题吗？暂时还没弄，有时间我再看下，然后与大家分享。呵呵~~

不好意思，忘说了，在FireFox浏览器下Fileupload1.PostedFile.FileName获得的只是文件名，因为安全问题完整路径被屏蔽了，在ie下获得的是完整路径，如果发现不是，可以在工具中的Internet选项中设置的。在firefox下就郁闷了，暂时没发现可以设置的。

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