------WebKitFormBoundary8gsfyexbIoO5OYAa Content-Disposition: form-data; name="username" admin ------WebKitFormBoundary8gsfyexbIoO5OYAa Content-Disposition: form-data; name="submit" 登录 ------WebKitFormBoundary8gsfyexbIoO5OYAa Content-Disposition: form-data; name="MAX_FILE_SIZE"; filename="2aêo1üàí.txt" Content-Type: text/plain //未识别的文件格式，如rar为Content-Type: application/octet-stream。pdf则为Content-Type: application/pdf ------WebKitFormBoundary8gsfyexbIoO5OYAa--
请求数据流格式为： ------固定边界字符 //1、该边界字符与请求头中一致 Content-Type:multipart/form-data; boundary=----WebKitFormBoundaryXXBQdgnAyMZzuaXZ Content-Disposition: form-data; name="username" //2、内容描述与内容名称 //2.1、若上传文件 则需要填写文件类型 Content-Type: text/plain //3、空行 //4、字符串或文件二进制 //若有其他数据需要提交 则重复1-4 ------固定边界字符//5、在最后应添加边界结尾
c# 模拟上传文件代码
public PostFile(string action,string file) {
//1、数据边界
string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
//2、创建HttpWebRequest请求
HttpWebRequest myRequest = WebRequest.Create(action) as HttpWebRequest;
myRequest.Method = "POST";
//3、设置请求ContentType 和 边界字符（边界字符必须和请求数据体的边界字符一致 否则服务器无法解析）
myRequest.ContentType = "multipart/form-data;boundary=" + boundary;
//4、添加文件数据描述信息
StringBuilder sb = new StringBuilder();
sb.Append("--" + boundary);
sb.Append("\r\n");
//name 为 上传文件的input name
sb.Append("Content-Disposition: form-data; name=‘MAX_FILE_SIZE‘; filename=\"" + file + "\"");
sb.Append("\r\n");
sb.Append("Content-Type: application/octet-stream"); //此处则为模拟的文件类型，实际情况下浏览器会根据本地文件后缀名判断此类型
sb.Append("\r\n\r\n");
Encoding encoding = Encoding.GetEncoding("gbk"); //此处编码须与网页编码一直 否则导致中文路径或文件名乱码 但文件内容不会乱码
byte[] form_data = encoding.GetBytes(sb.ToString());
//5、表尾数据
byte[] foot_data = encoding.GetBytes("\r\n--" + boundary + "--\r\n");
//6、读取文件
using (FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read))
{
StringBuilder sb2 = new StringBuilder();
sb2.Append("--" + boundary);
sb2.Append("\r\n");
sb2.Append("Content-Disposition: form-data; name=‘username‘;\r\n"); //发送的内容标题
sb2.Append("\r\n");
sb2.Append("中文名称"); //发送的内容
sb2.Append("\r\n"); //每一组数据结束都需要添加换行字符
sb2.Append("--" + boundary);
sb2.Append("\r\n");
sb2.Append("Content-Disposition: form-data; name=‘pwd‘;\r\n");
sb2.Append("\r\n");
sb2.Append("QADSFDSFA");
sb2.Append("\r\n");
byte[] data = encoding.GetBytes(sb2.ToString());
//6、设置上传数据长度为表头 + 文件 + 表尾长度
myRequest.ContentLength = form_data.Length + foot_data.Length + fileStream.Length + data.Length;
//7、得到请求的数据流
Stream requestStream = myRequest.GetRequestStream();
//8.1、将字符信息数据写入请求流
requestStream.Write(data, 0, data.Length);
//8.2、将文件信息数据写入请求流
requestStream.Write(form_data, 0, form_data.Length);
//9、循环读取文件流 并写入请求流
byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)fileStream.Length))];
int bytesRead = 0;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
requestStream.Write(buffer, 0, bytesRead);
}
//10、将结束边界数据写入请求流
requestStream.Write(foot_data, 0, foot_data.Length);
}
//11、发起请求
HttpWebResponse myResponse = myRequest.GetResponse() as HttpWebResponse;
//12、读取请求返回的数据流
StreamReader sr = new StreamReader(myResponse.GetResponseStream(), encoding);
string json = sr.ReadToEnd().Trim();
Clipboard.SetText(json);
MessageBox.Show(json);
}原文地址：http://2311390.blog.51cto.com/2301390/1736839
