二维码扫描下载

后端：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace ScanCodeDownload.Controllers
{
    public class HomeController : Controller
    {
 
        /// <summary>
        /// 下载
        /// </summary>
        /// <returns></returns>
        public JsonResult DownloadPeiZai()
        {
            Download.ResponseFile(@"C:\ScanCodeDownload\File\peizai.apk");
            return null;
        }
        /// <summary>
        /// 二维码显示首页
        /// </summary>
        /// <returns></returns>
        public ActionResult Index()
        {
            return View();
        }

    }
}

下载帮助类

 1 using System;
 2 using System.Collections.Generic;
 3 using System.IO;
 4 using System.Linq;
 5 using System.Text;
 6 using System.Web;
 7 
 8 namespace ScanCodeDownload
 9 {
10     public class Download
11     {
12 
13         public Download()
14         {
15         }
16 
17         public static bool ResponseFile(string fullPath)
18         {
19             HttpRequest request = HttpContext.Current.Request;
20             HttpResponse response = HttpContext.Current.Response;
21             try
22             {
23                 FileInfo info = new FileInfo(fullPath);
24                 if (info.Exists)
25                 {
26                     string name = info.Name;
27                     string extension = info.Extension;
28                     name = name.Substring(0, name.Length - extension.Length);
29                     while (HttpUtility.UrlEncode(name + extension, Encoding.UTF8).Length > 0x9c)
30                     {
31                         name = name.Substring(0, name.Length - 1);
32                     }
33                     name = HttpUtility.UrlEncode(name + extension, Encoding.UTF8);
34                     response.Clear();
35                     if (info.Length < 1024000)//0xfa000L)
36                     {
37                         response.ContentType = "application/octet-stream";
38                         response.AddHeader("Content-Disposition", "attachment;filename=" + name);
39                         response.WriteFile(info.FullName);
40                     }
41                     else
42                     {
43                         FileStream input = new FileStream(fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
44                         BinaryReader reader = new BinaryReader(input);
45                         try
46                         {
47                             long length = input.Length;
48                             long num2 = 0L;
49                             int count = 10240;// 0x2800;
50                             if (request.Headers["Range"] != null)
51                             {
52                                 response.StatusCode = 0xce;
53                                 num2 = Convert.ToInt64(request.Headers["Range"].Split(new char[] { '=', '-' })[1]);
54                             }
55                             response.AddHeader("Content-Length", (length - num2).ToString());
56                             if (num2 != 0L)
57                             {
58                                 response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", num2, length - 1L, length));
59                             }
60                             response.ContentType = "application/octet-stream";
61                             response.AddHeader("Content-Disposition", "attachment;filename=" + name);
62                             reader.BaseStream.Seek(num2, SeekOrigin.Begin);
63                             int num4 = ((int)Math.Floor((double)(((double)(length - num2)) / ((double)count)))) + 1;
64                             for (int i = 0; i < num4; i++)
65                             {
66                                 if (response.IsClientConnected)
67                                 {
68                                     response.BinaryWrite(reader.ReadBytes(count));
69                                     response.Flush();
70                                 }
71                                 else
72                                 {
73                                     i = num4;
74                                 }
75                             }
76                         }
77                         catch
78                         {
79                             return false;
80                         }
81                         finally
82                         {
83                             reader.Close();
84                             input.Close();
85                         }
86                     }
87                 }
88             }
89             catch (Exception exception)
90             {
91                 
92                 return false;
93             }
94             return true;
95         }
96 
97     }
98 }
下载帮助类Download

前端：

下载二维码JS:http://www.jq22.com/jquery-info294

注意事项：

$('#show_ecode').qrcode({ width: 92, height: 92, correctLevel: 0, text: "http://15f8n80281.iok.la/home/DownloadPeiZai" });地址必须是服务器带IP完整地址

@{
    ViewBag.Title = "Index";
    Layout = null;
}
<html>
<body>
    <div id='show_ecode' style="text-align: center; width: 92px; height: 92px; margin: 0px auto; margin-top: 50px; "></div>
</body>
</html>
<script src="~/Scripts/jquery-1.11.1.min.js"></script>
<script src="~/Scripts/qrcode/jquery.qrcode.min.js"></script>
<script type="text/javascript">
    $(function () {

        if (document.all)//ie
            $('#show_ecode').qrcode({ width: 92, height: 92, render: "table", text: "http://15f8n80281.iok.la/home/DownloadPeiZai" });
        else {
            $('#show_ecode').qrcode({ width: 92, height: 92, correctLevel: 0, text: "http://15f8n80281.iok.la/home/DownloadPeiZai" });
        }
    });

</script>

项目下载地址：

http://pan.baidu.com/s/1misJwSw

 

posted on 2017-01-18 13:04  高达  阅读(142)  评论(0)    收藏  举报

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