Html中的代码:
1 <!DOCTYPE html>
2 <html>
3 <head>
4 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
5 <title></title>
6 <meta charset="utf-8" />
7 <script src="Contents/JScript/jquery.min.js"></script>
8 </head>
9 <body>
10 <form id="uploadForm">
11 <!-- ajax请求的话不需要method="post" action="MvcUload.html" enctype="multipart/form-data"这些参数，否则405错误-->
12 <!--<form method="post" action="MvcUload.html" enctype="multipart/form-data" id="uploadForm">-->
13 <input type="file" name="file" id="file" /><button onclick="fnUpload()">上传文件</button>
14 </form>
15 <form method="post" action="../../UploadFiles/DownLoadFile" enctype="multipart/form-data" id="uploadForm1">
16 <button onclick="fnSubmit()">下载文件</button>
17 </form>
18 <script>
19 function fnUpload() {
20 var formData = new FormData($("#uploadForm")[0]);
21 $.ajax({
22 async: false,//要求同步 不是不需看你的需求
23 url: "../UploadFiles/SaveFile",
24 type: 'POST',
25 data: formData,
26 processData: false, //必须false才会避开jQuery对 formdata 的默认处理
27 contentType: false, //必须false才会自动加上正确的Content-Type
28 success: function (res) {
29 alert(res);
30 }, error: function (res) {
31 alert("请求失败");
32 }
33 });
34
35 }
36 function fnSubmit() {
37 $("#uploadForm1").submit();
38 }
39 </script>
40 </body>
41 </html>
C#后台控制器里面的方法：
1 public class UploadFilesController : Controller
2 {
3 //保存文件
4 public string SaveFile()
5 {
6 var result = "";
7 HttpFileCollection files = System.Web.HttpContext.Current.Request.Files;
8 if (files.Count>0)
9 {
10 HttpPostedFile file = files[0];//一次上传一个文件
11 if (file.ContentLength > 0)
12 {
13 try
14 {
15 var path = Server.MapPath("../uploadfiles");
16 if (!Directory.Exists(path)) Directory.CreateDirectory(path);
17 var combineName = System.IO.Path.Combine(path, System.IO.Path.GetFileName(file.FileName));//组合成路径
18 file.SaveAs(combineName);
19 result = "文件上传成功!";
20 }
21 catch (Exception e)
22 {
23 result = e.ToString();
24 }
25 }
26 else
27 result = "文件不能为空!";
28 }
29 else
30 result = "文件不能为空!";
31 return result;
32 }
33
34 //下载文件
35 public void DownLoadFile()
36 {
37 HttpRequest request = System.Web.HttpContext.Current.Request;
38 var re = request.Url;//查看请求地址，发现 /UploadFiles/DownLoadFile request.Url.LocalPath http://localhost:2565/UploadFiles/DownLoadFile request.Url.OriginalString
39 //请求地址都不是Controllers文件夹下面的地址,需要注意表单action的地址
40 HttpResponse response = System.Web.HttpContext.Current.Response;
41 var files = Directory.GetFiles(Server.MapPath("../uploadfiles"));
42 if (files.Length > 0) {
43 var fileUrl = files[0];//取第一个下载
44 var fileArr = fileUrl.Split('\\');
45 var fileName = fileArr[fileArr.Length - 1];
46 response.Clear();
47 response.ContentType = "application/octet-stream";
48 response.AddHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(fileName));
49 response.TransmitFile(fileName);
50 }
51 }
52 }