服务器多个文件打包压缩下载

引用：ICSharpCode.SharpZipLib.dll

 

 

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using zhan.File;
using ICSharpCode.SharpZipLib.Zip;
using System.IO;
using ICSharpCode.SharpZipLib.Checksums;

public partial class downfile : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.QueryString["path"] != null && Request.QueryString["path"].ToString() != "")
        {
            package(Request.QueryString["path"].ToString());
        }
        
    }
    private void package(string filename)
    {
        string file = filename.Substring(0, filename.LastIndexOf('.'));
        string suffix = filename.Substring(filename.LastIndexOf('.'), filename.Length - filename.LastIndexOf('.'));
        
        string[] files ={ filename, file + "_2" + suffix, file + "_3" + suffix };
        
        string zipname = DateTime.Now.ToString("yyyyMMddHHmmss") + ".zip";
        string zippath = "~/upload/temp/" + zipname;
        ZipFileDictory(files, zippath);

        FileStream fs = File.OpenRead(Server.MapPath(zippath));
        byte[] buffer = new byte[102400];
        long dataLengthToRead = fs.Length;//获取下载的文件总大小 

        fs.Position = 0;
        Response.ContentType = "application/octet-stream";
        Response.AddHeader("Content-Length", fs.Length.ToString());
        Response.AddHeader("content-disposition", "attachment;filename=" +HttpUtility.UrlEncode(zipname));
        while (dataLengthToRead > 0 && Response.IsClientConnected)
        {
            int lengthRead = fs.Read(buffer, 0, buffer.Length);//读取的大小 
            Response.OutputStream.Write(buffer, 0, lengthRead);
            Response.Flush();
            dataLengthToRead = dataLengthToRead - lengthRead;
        }
        fs.Close();
        fs.Dispose();
        File.Delete(Server.MapPath(zippath));
        Response.End();
    }
    public void ZipFileDictory(string[] filenames, string filename)
    {
        Crc32 crc = new Crc32();
        ZipOutputStream s = new ZipOutputStream(System.IO.File.Create(System.Web.HttpContext.Current.Server.MapPath(filename)));
        s.SetLevel(6);

        foreach (string file in filenames)
        {
            if (File.Exists(System.Web.HttpContext.Current.Server.MapPath(file)))
            {
                FileStream fs = System.IO.File.OpenRead(System.Web.HttpContext.Current.Server.MapPath(file));

                byte[] buffer = new byte[fs.Length];
                fs.Read(buffer, 0, buffer.Length);
                ZipEntry entry = new ZipEntry(file.Substring(file.LastIndexOf('/') + 1, file.Length - file.LastIndexOf('/') - 1));

                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);
            }
        }

        s.Finish();
        s.Close();
    }
}