如何搭建文件上传服务器（本地服务的文件上传与远程服务的文件上传）
如何搭建文件上传服务器（本地服务的文件上传与远程服务的文件上传）1 /// <summary> 2 /// 上传文件到远程服务器 3 /// </summary> 4 /// <param name="bytes"></param> 5 /// <param name="basepath"></param> 6 /// <param name="filename"></param> 7 /// <returns></returns> 8 public static string PostUploadFile(byte[] bytes string
文件上传属于常见业务，很多地方都用得到(比如图片上传);
确切地说，这里的“本地”是指的项目所在的服务端，只是在项目服务端再次请求另外一个服务端进行文件二次上传。
比如：我们上传图片的时候，请求项目的服务器需要上传一份，同时还要上传一份到cdn服务器。
示例使用控件： el-UpLoad 作为演示
1 <style>
2 .Uploader {
3 border: 1px dashed #d9d9d9;
4 border-radius: 6px;
5 cursor: pointer;
6 position: relative;
7 overflow: hidden;
8 }
9
10 .uploader:hover {
11 border-color: #409EFF;
12 }
13
14 .avatar-uploader-icon {
15 font-size: 28px;
16 color: #8c939d;
17 text-align: center;
18 }
19
20 .banners-size {
21 width: 280px;
22 height: 120px;
23 line-height: 120px;
24 }
25
26 .avatar-banners {
27 width: 280px;
28 height: 120px;
29 background-size: cover;
30 }
31
32 .el-upload__tip {
33 color: red;
34 }
35 </style>
1 <style>
2 .uploader {
3 border: 1px dashed #d9d9d9;
4 border-radius: 6px;
5 cursor: pointer;
6 position: relative;
7 overflow: hidden;
8 }
9
10 .uploader:hover {
11 border-color: #409EFF;
12 }
13
14 .avatar-uploader-icon {
15 font-size: 28px;
16 color: #8c939d;
17 text-align: center;
18 }
19
20 .banners-size {
21 width: 280px;
22 height: 120px;
23 line-height: 120px;
24 }
25
26 .avatar-banners {
27 width: 280px;
28 height: 120px;
29 background-size: cover;
30 }
31
32 .el-upload__tip {
33 color: red;
34 }
35 </style>
前端核心代码：
本地服务器上传接口：
1 /// <summary>
2 /// 本地上传图片
3 /// </summary>
4 /// <returns></returns>
5 [HttpPost]
6 public JsonResult UploadImg(string filename)
7 {
8 var result = new Common.CommonResult(1 "网络请求错误");
9 try
10 {
11 string basePath = ConfigurationManager.AppSettings["basePath"] ?? "\\Images"; //服务器上传文件夹
12 string imgpath = string.Empty;
13
14 HttpPostedFileBase file = Request.Files.Get(filename); //从browser传过来的的文件
15 //HttpPostedFile file = System.Web.HttpContext.Current.Request.Files.Get(filename); //从browser传过来的的文件
16
17 if (file != null && file.ContentLength > 0)
18 {
19 //文件后缀名
20 string fileExtension = Path.GetExtension(file.FileName).ToLower();
21
22 //获取文件名
23 string fileName = DateTime.Now.ToString("yyyy_MM_dd_HH_mm_ss_ffff");
24 fileName = fileExtension;
25
26 Stream postStream = file.InputStream;
27 byte[] bytes = new byte[postStream.Length];
28 postStream.Read(bytes 0 file.ContentLength);
29 postStream.Seek(0 SeekOrigin.Begin); //设置当前流的位置为流的开始
30 postStream.Close();
31
32 //写入本地
33 var repath = UploadHelper.UploadFile(bytes basePath fileName);
34
35 result.Code = 0;
36 result.Message = "OK";
37 result.Data = repath;
38 }
39 return Json(JsonConvert.SerializeObject(result));
40 }
41 catch (Exception)
42 {
43 return Json(JsonConvert.SerializeObject(result));
44 }
45 }
上传本地文件处理方法：UploadHelper.UploadFile()
1 /// <summary>
2 /// 上传文件到本地
3 /// </summary>
4 /// <param name="filename"></param>
5 /// <param name="basePath"></param>
6 /// <param name="bytes"></param>
7 /// <returns></returns>
8 public static string UploadFile(byte[] bytes string basePath string filename)
9 {
10 string result = "";
11 try
12 {
13 if (bytes != null)
14 {
15 //保存文件路径，比如：\\Images\\2020-01-01\\，这里的basePath相当于\\Images
16 string upfilePath = basePath "\\" DateTime.Now.ToString("yyyy-MM-dd") "\\"; //根路径
17 //上传到本地 ~/表示上级目录，如果不加则表示同级目录
18 string filePath = System.Web.HttpContext.Current.Server.MapPath("~/" upfilePath);
19 if (!Directory.Exists(filePath))
20 {
21 Directory.CreateDirectory(filePath);
22 }
23 //完整路径：项目目录\\Images\\2020-01-01\\abc.jpg
24 string fileSavePath = Path.Combine(filePath filename); //合并成完整的文件路径
25
26 //写入本地
27 using (FileStream fs = new FileStream(fileSavePath FileMode.Create))
28 {
29 fs.Write(bytes 0 bytes.Length);
30 fs.Close();
31 fs.Dispose();
32 }
33 //返回路径：/Images/2020-01-01/abc.jpg
34 result = (upfilePath filename).Replace("\\" "/");
35 }
36 else
37 {
38 result = "上传的文件信息不存在！";
39 }
40 }
41 catch (Exception ex)
42 {
43 return "";
44 }
45 return result;
46 }
一般向本地服务器上传的同时，还要向cdn服务器上传一份，请求cdn服务器接口代码如下：
1 /// <summary>
2 /// 上传文件到远程服务器
3 /// </summary>
4 /// <param name="bytes"></param>
5 /// <param name="basepath"></param>
6 /// <param name="filename"></param>
7 /// <returns></returns>
8 public static string PostUploadFile(byte[] bytes string basepath string filename)
9 {
10 string repath = "";
11 string hosturl = ConfigurationManager.AppSettings["apihost"] ?? "https://cache.xxxxxx.com:8080/"; //远程服务器路径
12 try
13 {
14 var apiurl = hosturl "api/UpLoad/ReceiveFile"; //远程请求接口 相当于：https://cache.xxxxxx.com:8080/api/UpLoad/ReceiveFile
15 HttpClient httpClient = HttpClientFactory.GetHttpClient();
16 string upfilePath = basepath "\\" DateTime.Now.ToString("yyyy-MM-dd") "\\"; //保存路径，比如：\\Images\\2020-01-01\\，basepath相当于\\Images
17 using (var multipartFormDataContent = new MultipartFormDataContent()) //MultipartFormDataContent相当于 "Content-Type": "multipart/form-data"
18 {
19 //二进制流传输 远程服务器可以使用: Request.Files.Get("filedata")接收
20 multipartFormDataContent.Add(new ByteArrayContent(bytes 0 bytes.Length) "filedata" filename);
21 //远程服务器可以使用: Request["filePath"]接收
22 multipartFormDataContent.Add(new StringContent(upfilePath Encoding.UTF8 "application/x-www-form-urlencoded") "filePath");
23
24 //post请求
25 var response = httpClient.PostAsync(apiurl multipartFormDataContent).Result;
26 if (response.StatusCode == System.Net.HttpStatusCode.OK)
27 {
28 var result = response.Content.ReadAsStringAsync().Result;
29 if ((int)response.StatusCode == 200)
30 {
31 repath = (upfilePath filename).Replace("\\" "/");
32 }
33 }
34 }
35 return repath;
36 }
37 catch (Exception ex)
38 {
39 return repath;
40 }
41 }
接下来看看在远程cdn服务器上如何接收本地服务器上传过来的文件，实际上跟本地服务器上传没多大区别。
创建一个文件上传服务，比如创建一个WebApI服务，创建一个文件上传接口：/api/UpLoad/ReceiveFile，然后将该服务发布到IIS上即可
然后客户端请求路径：https://cache.xxxxxx.com:8080/api/UpLoad/ReceiveFile
1 /// <summary>
2 /// 文件上传服务
3 /// </summary>
4 public class UpLoadController : ApiController
5 {
6 /// <summary>
7 /// 文件接收接口
8 /// </summary>
9 /// <returns></returns>
10 [HttpPost]
11 public HttpResponseMessage ReceiveFile()
12 {
13 HttpResponseMessage response = null;
14 try
15 {
16 HttpPostedFile file = HttpContext.Current.Request.Files.Get("filedata"); //获取文件流
17 string getfilepath = HttpContext.Current.Request["filePath"] ?? "\\Images\\"; //获取保存路径(不包含文件名)，默认：\\Images\\
18 var filename = file.FileName; //获取文件名
19
20 //保存到本地的路径，~/表示指向上级根目录
21 string savePath = HttpContext.Current.Server.MapPath("~/" getfilepath);
22
23 //创建文件夹
24 if (!Directory.Exists(savePath))
25 {
26 Directory.CreateDirectory(savePath);
27 }
28
29 //保存文件到指定路径下
30 string saveFilePath = Path.Combine(savePath filename);
31 Stream postStream = file.InputStream;
32 using (FileStream fs = new FileStream(saveFilePath FileMode.Create))
33 {
34 byte[] new_b = new byte[postStream.Length];
35 while (postStream.Read(new_b 0 new_b.Length) != 0)
36 {
37 fs.Write(new_b 0 new_b.Length);
38 }
39 postStream.Close();
40 fs.Close();
41 fs.Dispose();
42 }
43 response = Request.CreateResponse(HttpStatusCode.OK); //成功返回200
44 }
45 catch (Exception)
46 {
47 response = Request.CreateResponse(HttpStatusCode.BadRequest); //返回400
48 }
49 return response;
50 }
51
52 }
.Add(new ByteArrayContent(bytes 0 bytes.Length) "filedata" filename);
21 //远程服务器可以使用: Request["filePath"]接收
22 multipartFormDataContent.Add(new StringContent(upfilePath Encoding.UTF8 "application/x-www-form-urlencoded") "filePath");
23
24 //post请求
25 var response = httpClient.PostAsync(apiurl multipartFormDataContent).Result;
26 if (response.StatusCode == System.Net.HttpStatusCode.OK)
27 {
28 var result = response.Content.ReadAsStringAsync().Result;
29 if ((int)response.StatusCode == 200)
30 {
31 repath = (upfilePath filename).Replace("\\" "/");
32 }
33 }
34 }
35 return repath;
36 }
37 catch (Exception ex)
38 {
39 return repath;
40 }
41 }
接下来看看在远程cdn服务器上如何接收本地服务器上传过来的文件，实际上跟本地服务上传没多大区别。
创建一个文件上传服务，比如创建一个WebApI服务，创建一个文件上传接口：/api/UpLoad/ReceiveFile，然后将该服务发布到IIS上即可
然后客户端请求路径：https://cache.xxxxxx.com:8080/api/UpLoad/ReceiveFile
1 /// <summary>
2 /// 文件上传服务
3 /// </summary>
4 public class UpLoadController : ApiController
5 {
6 /// <summary>
7 /// 文件接收接口
8 /// </summary>
9 /// <returns></returns>
10 [HttpPost]
11 public HttpResponseMessage ReceiveFile()
12 {
13 HttpResponseMessage response = null;
14 try
15 {
16 HttpPostedFile file = HttpContext.Current.Request.Files.Get("filedata"); //获取文件流
17 string getfilepath = HttpContext.Current.Request["filePath"] ?? "\\Images\\"; //获取保存路径(不包含文件名)，默认：\\Images\\
18 var filename = file.FileName; //获取文件名
19
20 //保存到本地的路径，~/表示指向上级根目录
21 string savePath = HttpContext.Current.Server.MapPath("~/" getfilepath);
22
23 //创建文件夹
24 if (!Directory.Exists(savePath))
25 {
26 Directory.CreateDirectory(savePath);
27 }
28
29 //保存文件到指定路径下
30 string saveFilePath = Path.Combine(savePath filename);
31 Stream postStream = file.InputStream;
32 using (FileStream fs = new FileStream(saveFilePath FileMode.Create))
33 {
34 byte[] new_b = new byte[postStream.Length];
35 while (postStream.Read(new_b 0 new_b.Length) != 0)
36 {
37 fs.Write(new_b 0 new_b.Length);
38 }
39 postStream.Close();
40 fs.Close();
41 fs.Dispose();
42 }
43 response = Request.CreateResponse(HttpStatusCode.OK); //成功返回200
44 }
45 catch (Exception)
46 {
47 response = Request.CreateResponse(HttpStatusCode.BadRequest); //返回400
48 }
49 return response;
50 }
51
52 }
