这是客户端代码（C#）：
string boundary = "--ABC";
try
{
WebRequest request = WebRequest.Create(url);
request.Method = "POST";
request.ContentType = "multipart/form-data;boundary="+boundary;
using (var requestStream = request.GetRequestStream())
using (var writer = new StreamWriter(requestStream))
{
writer.WriteLine(boundary);
writer.WriteLine("Content-Disposition: form-data; name='"data'"");
writer.WriteLine();
writer.WriteLine("abcdefg");
writer.WriteLine(boundary + "--");
writer.Flush();
}
string responseData = string.Empty;
using (var response = request.GetResponse())
using (var responseStream = response.GetResponseStream())
using (var reader = new StreamReader(responseStream))
{
responseData=reader.ReadToEnd();
}
这是服务器代码 （PHP）：
print file_get_contents("php://input");
或：
print $_POST["data"];
或：
print $http_raw_post_data;
或：
$fp=fopen("php://output","rb");
$contents=fread($fp,5);
fclose($fp);
print $contents;
这些代码都不起作用，全部打印为空。
有人可以帮忙吗？
以下示例说明了"多部分/表单数据"编码。假设我们有以下形式：
<FORM action="http://server.com/cgi/handle"
enctype="multipart/form-data"
method="post">
<P>
What is your name? <INPUT type="text" name="submit-name"><BR>
What files are you sending? <INPUT type="file" name="files"><BR>
<INPUT type="submit" value="Send"> <INPUT type="reset">
</FORM>
如果用户在文本输入中输入"Larry"，并选择文本文件"file1.txt"，则用户代理可能会发回以下数据：
Content-Type: multipart/form-data; boundary=AaB03x
--AaB03x
Content-Disposition: form-data; name="submit-name"
Larry
--AaB03x
Content-Disposition: form-data; name="files"; filename="file1.txt"
Content-Type: text/plain
... contents of file1.txt ...
--AaB03x--
如果用户选择了第二个（图像）文件"file2.gif"，则用户代理可能会按如下方式构造部件：
Content-Type: multipart/form-data; boundary=AaB03x
--AaB03x
Content-Disposition: form-data; name="submit-name"
Larry
--AaB03x
Content-Disposition: form-data; name="files"
Content-Type: multipart/mixed; boundary=BbC04y
--BbC04y
Content-Disposition: file; filename="file1.txt"
Content-Type: text/plain
... contents of file1.txt ...
--BbC04y
Content-Disposition: file; filename="file2.gif"
Content-Type: image/gif
Content-Transfer-Encoding: binary
...contents of file2.gif...
--BbC04y--
--AaB03x--
C# 中的多部分表单发布示例
试试这个：
string boundary = "AaB03x";
try
{
WebRequest request = WebRequest.Create(url);
request.Method = "POST";
request.ContentType = "multipart/form-data;boundary="+boundary;
using (var requestStream = request.GetRequestStream())
using (var writer = new StreamWriter(requestStream))
{
writer.WriteLine("--"+boundary);
writer.WriteLine( "Content-Disposition: form-data; name='"files'"; filename='"file1.txt'"");
writer.WriteLine("Content-Type: text/plain
");
writer.WriteLine("example");
writer.WriteLine("--"boundary + "--");
writer.Flush();
}
string responseData = string.Empty;
using (var response = request.GetResponse())
using (var responseStream = response.GetResponseStream())
using (var reader = new StreamReader(responseStream))
{
responseData=reader.ReadToEnd();
}