DevicesServiceIntern/DevicesService/Commen/ChunkedUpload.cs

using Newtonsoft.Json.Linq;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;
using Device.ApiCommonModel.AksModel;


namespace DevicesService.Common
{
    public class ChunkedUpload
    {
        private readonly HttpClient _httpClient;

        public ChunkedUpload(HttpClient httpClient)
        {
            _httpClient = httpClient;
        }

        public async Task<string> UploadFileAsync(string url, string filePath)
        {
            string ret = string.Empty;
            using (var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
            {
                FileInfo fileInfo = new FileInfo(filePath);
                int totalParts = 1;
                int chunkNumber = 1;
                // 读取文件流其实位置
                var fileStreamPos = 0;
                var uploadUrl = $"{url}?partNumber={chunkNumber}&chunks={totalParts}&size={fileInfo.Length}&start={fileStreamPos}&end={fileInfo.Length}&total={fileInfo.Length}&FileName={Path.GetFileName(filePath)}";

                using (var client = new HttpClient())
                {

                    var formData = new MultipartFormDataContent();
                    formData.Add(new StreamContent(fileStream, (int)fileStream.Length), "file", Path.GetFileName(filePath) + ".partNumber-1");
                    var response = await client.PostAsync(uploadUrl, formData);
                    var responseString = await response.Content.ReadAsStringAsync();
                    fileStream.Close();
                    fileStream.Dispose();
                    ret = responseString;
                    JObject jo = (JObject)JsonConvert.DeserializeObject(ret);
                    if (Convert.ToBoolean(jo["IsSucceed"].ToString()) == true)
                    {
                        string result = jo["result"].ToString();
                        JObject jo1 = (JObject)JsonConvert.DeserializeObject(result);
                        ret = jo1["url"].ToString();
                    }
                }
            }
            return ret;
        }
    }
}