Question

我在asp.net mvc中使用HttpWebRequest自动执行http post的过程。

基本上如果Http帖子成功，它会将所有post值写入数据库或文件。

它适用于简单类型，如strings，int，datetime。但我不确定如何从图像或其他文件（如.doc，.pdf ...

创建查询字符串

手动上传文件时，文件的输入值为UploadedFile:****.JPG;选择本地文件后，我可以做http帖子

string mimeType = Request.Files[upload].ContentType;
Stream fileStream = Request.Files[upload].InputStream;
string fileName = Path.GetFileName(Request.Files[upload].FileName);
int fileLength = Request.Files[upload].ContentLength;
byte[] fileData = new byte[fileLength];
fileStream.Read(fileData, 0, fileLength);
...

但我正在进行自动化，所以我想我需要一个类似field1=value1&field2=value2&UploadedFile=****.JPG的查询字符串;但我认为该过程不起作用，因为网页不知道图像在哪里。那么任何想法使用一个神奇的Url来定位图像或任何文件，以便我可以将它转换为字节数组并操纵它？

Answer 1

您可以使用base64编码将二进制数据转换为字符串，然后将其放入查询字符串中，但不建议这样做。对于发送二进制数据，最好在http请求中使用post方法及其数据。

like this，或^，^，^。

和代码：

public void PostMultipleFiles(string url, string[] files)
{
    string boundary = "----------------------------" + DateTime.Now.Ticks.ToString("x");
    HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);
    httpWebRequest.ContentType = "multipart/form-data; boundary=" + boundary;
    httpWebRequest.Method = "POST";
    httpWebRequest.KeepAlive = true;
    httpWebRequest.Credentials = System.Net.CredentialCache.DefaultCredentials;
    using(Stream memStream = new System.IO.MemoryStream())
    {
        byte[] boundarybytes =System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary     +"\r\n");
        string formdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition:  form-data; name=\"{0}\";\r\n\r\n{1}";
        string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n Content-Type: application/octet-stream\r\n\r\n";
        memStream.Write(boundarybytes, 0, boundarybytes.Length);
        for (int i = 0; i < files.Length; i++)
        {
            string header = string.Format(headerTemplate, "file" + i, files[i]);
            //string header = string.Format(headerTemplate, "uplTheFile", files[i]);
            byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
            memStream.Write(headerbytes, 0, headerbytes.Length);
            using(FileStream fileStream = new FileStream(files[i], FileMode.Open, FileAccess.Read))
            {
                byte[] buffer = new byte[1024];
                int bytesRead = 0;
                while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                {
                    memStream.Write(buffer, 0, bytesRead);
                }
                memStream.Write(boundarybytes, 0, boundarybytes.Length);
            }
        }
        httpWebRequest.ContentLength = memStream.Length;
        using(Stream requestStream = httpWebRequest.GetRequestStream())
        {
            memStream.Position = 0;
            byte[] tempBuffer = new byte[memStream.Length];
            memStream.Read(tempBuffer, 0, tempBuffer.Length);
            requestStream.Write(tempBuffer, 0, tempBuffer.Length);
        }
    }
    try
    {
        WebResponse webResponse = httpWebRequest.GetResponse();
        Stream stream = webResponse.GetResponseStream();
        StreamReader reader = new StreamReader(stream);
        string var = reader.ReadToEnd();
    }
    catch (Exception ex)
    {
        // ...
    }
}

如何模拟http post文件上传过程？

1 个答案: