C# 通过http post 请求上传图片和参数

一、C# Winform或控制台

 1 /// <summary>
 2         /// 通过http上传图片及传参数
 3         /// </summary>
 4         /// <param name="imgPath">图片地址(绝对路径：D:demoimg123.jpg)</param>
 5         public void UploadImage(string imgPath)
 6         {
 7             var uploadUrl = "http://localhost:3020/upload/imgup";
 8             var dic = new Dictionary<string, string>() {
 9                     {"para1",1.ToString() },
10                     {"para2",2.ToString() },
11                     {"para3",3.ToString() },
12                 };
13             var postData = Utils.BuildQuery(dic);//转换成：para1=1&para2=2&para3=3
14             var postUrl = string.Format("{0}?{1}", uploadUrl, postData);//拼接url
15             HttpWebRequest request = WebRequest.Create(postUrl) as HttpWebRequest;
16             request.AllowAutoRedirect = true;
17             request.Method = "POST";
18 
19             string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线
20             request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
21             byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("
--" + boundary + "
");
22             byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("
--" + boundary + "--
");
23 
24             int pos = imgPath.LastIndexOf("\");
25             string fileName = imgPath.Substring(pos + 1);
26 
27             //请求头部信息 
28             StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name="file";filename="{0}"
Content-Type:application/octet-stream

", fileName));
29             byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());
30 
31             FileStream fs = new FileStream(imgPath, FileMode.Open, FileAccess.Read);
32             byte[] bArr = new byte[fs.Length];
33             fs.Read(bArr, 0, bArr.Length);
34             fs.Close();
35 
36             Stream postStream = request.GetRequestStream();
37             postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
38             postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
39             postStream.Write(bArr, 0, bArr.Length);
40             postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
41             postStream.Close();
42 
43             HttpWebResponse response = request.GetResponse() as HttpWebResponse;
44             Stream instream = response.GetResponseStream();
45             StreamReader sr = new StreamReader(instream, Encoding.UTF8);
46             string content = sr.ReadToEnd();
47         }

二、图片接收接口

[ValidateInput(false)]
        public JsonResult imgup(string para1,string para2,string para3)
        {
            if (Request.Files.Count > 0)
            {
                //传过来的图片
                var file = Request.Files[0];
                //保存到本地或服务器

            }
            return new JsonResult { };
        }

 1  /// <summary>
 2         /// 上传图片信息
 3         /// </summary> 
 4         /// <returns></returns>
 5         [ValidateInput(false)]
 6         public JsonResult ImgUp()
 7         {
 8             try
 9             {
10                 if (Request.Files.Count > 0)
11                 {
12                     HttpPostedFileBase file = Request.Files[0];
13                     string path = file.FileName;//获取Execle文件名    
14                     string IsXls = System.IO.Path.GetExtension(path).ToString().ToLower();
15                     string fileName = DateTime.Now.ToString("yyyyMMddhh") + IsXls;
16                     string savePath = Server.MapPath(("~\Upload\") + fileName);//Server.MapPath 获得虚拟服务器相对路径
17                     file.SaveAs(savePath); //SaveAs 将上传的文件内容保存在服务器上 
18                 }
19                 return Json(new { Success = true, Message = "成功" }, JsonRequestBehavior.AllowGet);
20             }
21             catch (Exception ex)
22             {
23                 return Json(new { Success = false, Message = "失败" }, JsonRequestBehavior.AllowGet);
24             }
25         }

转自连接：https://www.cnblogs.com/pingming/p/8550802.html

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