public static string UploadToServer(HttpPostedFile file, Const.ImgFunc func)
{
UploadParameterType p = new UploadParameterType();
p.Url = Util.GetAppSetting("UploadUrlPrefix") + "/api/img";
//p.Url = "http://localhost:17942/upload/uploadpicture";
p.UploadStream = file.InputStream;
p.FileNameValue = file.FileName;
p.PostParameters.Add("func", ((int)func).ToString());
return(Execute(p));
}
public static string Execute(UploadParameterType parameter)
{
using (MemoryStream memoryStream = new MemoryStream())
{
// 1.分界线
string boundary = string.Format("----{0}", DateTime.Now.Ticks.ToString("x")), // 分界线可以自定义参数
beginBoundary = string.Format("--{0}\r\n", boundary),
endBoundary = string.Format("\r\n--{0}--\r\n", boundary);
byte[] beginBoundaryBytes = parameter.Encoding.GetBytes(beginBoundary),
endBoundaryBytes = parameter.Encoding.GetBytes(endBoundary);
// 2.组装开始分界线数据体 到内存流中
memoryStream.Write(beginBoundaryBytes, 0, beginBoundaryBytes.Length);
// 3.组装 上传文件附加携带的参数 到内存流中
if (parameter.PostParameters != null && parameter.PostParameters.Count > 0)
{
foreach (KeyValuePair <string, string> keyValuePair in parameter.PostParameters)
{
string parameterHeaderTemplate = string.Format("Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}\r\n{2}", keyValuePair.Key, keyValuePair.Value, beginBoundary);
byte[] parameterHeaderBytes = parameter.Encoding.GetBytes(parameterHeaderTemplate);
memoryStream.Write(parameterHeaderBytes, 0, parameterHeaderBytes.Length);
}
}
// 4.组装文件头数据体 到内存流中
string fileHeaderTemplate = string.Format("Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n", parameter.FileNameKey, parameter.FileNameValue);
byte[] fileHeaderBytes = parameter.Encoding.GetBytes(fileHeaderTemplate);
memoryStream.Write(fileHeaderBytes, 0, fileHeaderBytes.Length);
// 5.组装文件流 到内存流中
byte[] buffer = new byte[1024 * 1024 * 1];
int size = parameter.UploadStream.Read(buffer, 0, buffer.Length);
while (size > 0)
{
memoryStream.Write(buffer, 0, size);
size = parameter.UploadStream.Read(buffer, 0, buffer.Length);
}
// 6.组装结束分界线数据体 到内存流中
memoryStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
// 7.获取二进制数据
byte[] postBytes = memoryStream.ToArray();
// 8.HttpWebRequest 组装
HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(new Uri(parameter.Url, UriKind.RelativeOrAbsolute));
webRequest.Method = "POST";
webRequest.Timeout = 10000;
webRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);
webRequest.ContentLength = postBytes.Length;
// 9.写入上传请求数据
using (Stream requestStream = webRequest.GetRequestStream())
{
requestStream.Write(postBytes, 0, postBytes.Length);
requestStream.Close();
}
// 10.获取响应
using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse())
{
using (StreamReader reader = new StreamReader(webResponse.GetResponseStream(), parameter.Encoding))
{
string body = reader.ReadToEnd();
reader.Close();
return(body);
}
}
}
}
