C#模拟表单上传文件及参数时报错
0
悬赏园豆：200
[已解决问题]
解决于 2021-05-07 10:54
string serviceUrl = string.Format("http://" + IP + "/api/wj.kc?act=UploadFile");
HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(serviceUrl);
string filePath = @"C://Shot//Manual.jpg";
string fileName = "Manual.jpg";
if (File.Exists(filePath))
{
byte[] fileContentByte = new byte[1024]; // 文件内容二进制
FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read);
fileContentByte = new byte[fs.Length]; // 二进制文件
fs.Read(fileContentByte, 0, Convert.ToInt32(fs.Length));
fs.Close();
dynamic s =
new
{
parms =
new
{
s_yonghuh = yonghuh,
i_year = year
}
};
string json = JsonConvert.SerializeObject(s);
var buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(json);
string boundary = "----" + DateTime.Now.Ticks.ToString("x");
string Enter = "\r\n";
string modelIdStr = "--" + boundary + Enter
+ "Content-Disposition: form-data; name=\"parms\"" + Enter + Enter
+ json + Enter;
string fileContentStr = "--" + boundary + Enter
+ "Content-Type:image/jpeg" + Enter
+ "Content-Disposition: form-data; name=\"fileContent\"; filename=\"" + fileName + "\"" + Enter + Enter;
myRequest.Method = "POST";
myRequest.Timeout = 70000;
myRequest.ContentType = string.Format("multipart/form-data; boundary={0}", boundary);
myRequest.MaximumAutomaticRedirections = 1;
myRequest.AllowAutoRedirect = true;
myRequest.KeepAlive = true;
myRequest.UserAgent = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36";
myRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
Stream myRequestStream = myRequest.GetRequestStream();
var modelIdStrByte = Encoding.UTF8.GetBytes(modelIdStr);//modelId所有字符串二进制
var fileContentStrByte = Encoding.UTF8.GetBytes(fileContentStr);//fileContent一些名称等信息的二进制（不包含文件本身）
myRequestStream.Write(modelIdStrByte, 0, modelIdStrByte.Length);
myRequestStream.Write(fileContentStrByte, 0, fileContentStrByte.Length);
myRequestStream.Write(fileContentByte, 0, fileContentByte.Length);
// 获取接口返回值
// 通过Web访问对象获取响应内容
HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
//通过响应内容流创建StreamReader对象，因为StreamReader更高级更快
StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
string returnXml = reader.ReadToEnd();//利用StreamReader就可以从响应内容从头读到尾
reader.Close();
myResponse.Close();
最佳答案
0
下面是我的代码（根据业务，你自己调整一下）
internal class UploadHelper
{
public static string PostDataFile(UploadInfo info)
{
#region
if (info == null) throw new ArgumentNullException(nameof(info));
if (string.IsNullOrEmpty(info.ComparyId)) throw new ArgumentNullException(info.ComparyId);
if (string.IsNullOrEmpty(info.UploadType)) throw new ArgumentNullException(info.UploadType);
if (string.IsNullOrEmpty(info.TokenKey)) throw new ArgumentNullException(info.TokenKey);
if (string.IsNullOrEmpty(info.FileName)) throw new ArgumentNullException(info.FileName);
int tmpInt;
if (!int.TryParse(info.ComparyId, out tmpInt)) throw new InvalidCastException(info.FileName);
if (!int.TryParse(info.UploadType, out tmpInt)) throw new InvalidCastException(info.UploadType);
if (info.Bytes == null || info.Bytes.Length < 1) throw new ArgumentException("info.Bytes");
#endregion
#region build Boundary
var tmpGuid = Guid.NewGuid();
var strBoundary = "--" + tmpGuid;
var strbtyes = Encoding.UTF8.GetBytes("\r\n" + strBoundary + "--\r\n");
var sb = new StringBuilder();
//第一个参数(companyID)
sb.Append(strBoundary);
sb.Append("\r\n");
sb.Append("Content-Type: text/plain; charset=utf-8");
sb.Append("\r\n");
sb.Append("Content-Disposition: form-data; name=companyID");
sb.Append("\r\n\r\n");
sb.Append(info.ComparyId);
sb.Append("\r\n");
//第二个参数(uploadType)
sb.Append(strBoundary);
sb.Append("\r\n");
sb.Append("Content-Type: text/plain; charset=utf-8");
sb.Append("\r\n");
sb.Append("Content-Disposition: form-data; name=uploadType");
sb.Append("\r\n\r\n");
sb.Append(info.UploadType);
sb.Append("\r\n");
//第三个参数(tokenKey)
sb.Append(strBoundary);
sb.Append("\r\n");
sb.Append("Content-Type: text/plain; charset=utf-8");
sb.Append("\r\n");
sb.Append("Content-Disposition: form-data; name=tokenKey");
sb.Append("\r\n\r\n");
sb.Append(info.TokenKey);
sb.Append("\r\n");
//第四个参数(文件信息)
sb.Append(strBoundary);
sb.Append("\r\n");
sb.Append("Content-Disposition: form-data; name=attachment; filename=\"" + info.FileName + "\"");
sb.Append("\r\n\r\n");
#endregion
var headerBytes = Encoding.UTF8.GetBytes(sb.ToString());
var request = (HttpWebRequest) WebRequest.Create(info.url);
request.ContentType = "multipart/form-data; boundary=\"" + tmpGuid + "\"";
request.Method = "POST";
request.AllowWriteStreamBuffering = false;
request.KeepAlive = true;
request.Timeout = 1000*60*5;
request.ServicePoint.Expect100Continue = true;
request.ContentLength = headerBytes.Length + info.Bytes.Length + strbtyes.Length;
using (var stream = request.GetRequestStream())
{
stream.Write(headerBytes, 0, headerBytes.Length);
stream.Write(info.Bytes, 0, info.Bytes.Length);
stream.Write(strbtyes, 0, strbtyes.Length);
using (var oWResponse = request.GetResponse())
using (var s = oWResponse.GetResponseStream())
{
if (s == null) throw new ArgumentNullException(info.ComparyId);
return (new StreamReader(s)).ReadToEnd();
}
}
}
}
public sealed class UploadInfo
{
public Uri url { get; set; }
public string FileName { get; set; }
public string ComparyId { get; set; }
public string UploadType { get; set; }
public string TokenKey { get; set; }
public byte[] Bytes { get; set; }
}
收获园豆：200
其他回答(2)
0
HttpWebRequest 没怎么用过，一般都是用HttpClient
0
接口框架有修改导致报错
