jDownload是jQuery的一个下载插件,用户可以在下载文件之前知道文件的详细信息,在提高用户体验度方面起到了很大的作用。
鉴于官网的Demo是通过PHP文件来获取资源信息,对于ASP.NET开发人员来说不是很容易理解,所以本人写了一个ASP.NET的版本希望对jQuery有爱的童鞋们有所帮助。
一、首先添加一个测试页面Default.aspx,引用测试脚本和样式。
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.0/themes/base/jquery-ui.css"/>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery-ui.min.js"></script>
<link rel="stylesheet" href="/jquery.jDownload.css"/>
<script type="text/javascript" src="/jquery.jDownload.js"></script>
<script type="text/javascript">
$(document).ready(function() {
/* basic usage */
$('.download').jDownload();
});
</script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery-ui.min.js"></script>
<link rel="stylesheet" href="/jquery.jDownload.css"/>
<script type="text/javascript" src="/jquery.jDownload.js"></script>
<script type="text/javascript">
$(document).ready(function() {
/* basic usage */
$('.download').jDownload();
});
</script>
在body里添加测试代码
<div>
<p>
<a href="images/hubble1.jpg" class="download" title="这是图片1">Download here</a></p>
<p>
<a href="images/hubble2.jpg" class="download" title="这是图片2">Download here</a></p>
<p>
<a href="images/hubble3.jpg" class="download" title="这是图片3">Download here</a></p>
<a id="download" class="download" href="ReportTemplates/测试.xls">导出</a>
</div>
<p>
<a href="images/hubble1.jpg" class="download" title="这是图片1">Download here</a></p>
<p>
<a href="images/hubble2.jpg" class="download" title="这是图片2">Download here</a></p>
<p>
<a href="images/hubble3.jpg" class="download" title="这是图片3">Download here</a></p>
<a id="download" class="download" href="ReportTemplates/测试.xls">导出</a>
</div>
二、添加一个提供获取信息及下载用的页面jdownload.aspx,在cs文件中编写以下代码。
1 using System;
2 using System.IO;
3 using System.Runtime.Serialization;
4 using System.Runtime.Serialization.Json;
5 using System.Text;
6 using System.Web;
7
8 namespace JDownload
9 {
10 public partial class jdownload : System.Web.UI.Page
11 {
12 string action = string.Empty;
13 string path = string.Empty;
14
15 protected void Page_Load(object sender, EventArgs e)
16 {
17 action = Request.QueryString["action"];
18 path = Server.UrlDecode(Request.QueryString["path"]);
19
20 if (!String.IsNullOrEmpty(path))
21 {
22 switch (action)
23 {
24 case"download":
25 GetFile(path);
26 break;
27
28 case"info":
29 GetInfo(path);
30 break;
31 }
32 }
33 Response.Write(GetJson(new MyFileInfo() { Error ="error" }));
34 Response.End();
35 }
36
37 private void GetFile(string path)
38 {
39 // get file info
40 FileInfo fi =new FileInfo(Server.MapPath(path));
41 string fileName = fi.Name;//客户端保存的文件名
42 string filePath = Server.MapPath(path);//路径
43 //以字符流的形式下载文件
44 FileStream fs =new FileStream(filePath, FileMode.Open);
45 byte[] bytes =newbyte[(int)fs.Length];
46 fs.Read(bytes, 0, bytes.Length);
47 fs.Close();
48 Response.ContentType ="application/octet-stream";
49 //通知浏览器下载文件而不是打开
50 Response.AddHeader("Content-Disposition", "attachment; filename="+ HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
51 Response.BinaryWrite(bytes);
52 Response.Flush();
53 Response.End();
54 }
55
56 private void GetInfo(string path)
57 {
58 // get file info
59 FileInfo fi =new FileInfo(Server.MapPath(path));
60 MyFileInfo myFileInfo =new MyFileInfo()
61 {
62 FileName = fi.Name,
63 FileType = fi.Extension,
64 FileSize = (fi.Length /long.Parse("1024")).ToString(),
65 Error ="null"
66 };
67 Response.Write(GetJson(myFileInfo));
68 Response.End();
69 }
70
71
72 public static string GetJson<T>(T obj)
73 {
74 DataContractJsonSerializer json =new DataContractJsonSerializer(typeof(T));
75 using (MemoryStream ms =new MemoryStream())
76 {
77 json.WriteObject(ms, obj);
78 string szJson = Encoding.UTF8.GetString(ms.ToArray());
79 return szJson;
80 }
81 }
82
83 [DataContract]
84 class MyFileInfo
85 {
86 [DataMember]
87 public string FileName { get; set; }
88 [DataMember]
89 public string FileType { get; set; }
90 [DataMember]
91 public string FileSize { get; set; }
92 [DataMember]
93 public string Error { get; set; }
94 }
95 }
96 }
2 using System.IO;
3 using System.Runtime.Serialization;
4 using System.Runtime.Serialization.Json;
5 using System.Text;
6 using System.Web;
7
8 namespace JDownload
9 {
10 public partial class jdownload : System.Web.UI.Page
11 {
12 string action = string.Empty;
13 string path = string.Empty;
14
15 protected void Page_Load(object sender, EventArgs e)
16 {
17 action = Request.QueryString["action"];
18 path = Server.UrlDecode(Request.QueryString["path"]);
19
20 if (!String.IsNullOrEmpty(path))
21 {
22 switch (action)
23 {
24 case"download":
25 GetFile(path);
26 break;
27
28 case"info":
29 GetInfo(path);
30 break;
31 }
32 }
33 Response.Write(GetJson(new MyFileInfo() { Error ="error" }));
34 Response.End();
35 }
36
37 private void GetFile(string path)
38 {
39 // get file info
40 FileInfo fi =new FileInfo(Server.MapPath(path));
41 string fileName = fi.Name;//客户端保存的文件名
42 string filePath = Server.MapPath(path);//路径
43 //以字符流的形式下载文件
44 FileStream fs =new FileStream(filePath, FileMode.Open);
45 byte[] bytes =newbyte[(int)fs.Length];
46 fs.Read(bytes, 0, bytes.Length);
47 fs.Close();
48 Response.ContentType ="application/octet-stream";
49 //通知浏览器下载文件而不是打开
50 Response.AddHeader("Content-Disposition", "attachment; filename="+ HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
51 Response.BinaryWrite(bytes);
52 Response.Flush();
53 Response.End();
54 }
55
56 private void GetInfo(string path)
57 {
58 // get file info
59 FileInfo fi =new FileInfo(Server.MapPath(path));
60 MyFileInfo myFileInfo =new MyFileInfo()
61 {
62 FileName = fi.Name,
63 FileType = fi.Extension,
64 FileSize = (fi.Length /long.Parse("1024")).ToString(),
65 Error ="null"
66 };
67 Response.Write(GetJson(myFileInfo));
68 Response.End();
69 }
70
71
72 public static string GetJson<T>(T obj)
73 {
74 DataContractJsonSerializer json =new DataContractJsonSerializer(typeof(T));
75 using (MemoryStream ms =new MemoryStream())
76 {
77 json.WriteObject(ms, obj);
78 string szJson = Encoding.UTF8.GetString(ms.ToArray());
79 return szJson;
80 }
81 }
82
83 [DataContract]
84 class MyFileInfo
85 {
86 [DataMember]
87 public string FileName { get; set; }
88 [DataMember]
89 public string FileType { get; set; }
90 [DataMember]
91 public string FileSize { get; set; }
92 [DataMember]
93 public string Error { get; set; }
94 }
95 }
96 }
三、注意事项
在使用 System.Runtime.Serialization.Json 时需要引用System.ServiceModel.Web的DLL
源码下载Click Me