如何在iOS上模拟HTTP表单(POST)提交

Question

我正在使用AFNetworking框架,需要向服务器提交表单(POST)请求.以下是服务器期望的示例:

<form id="form1" method="post" action="http://www.whereq.com:8079/answer.m">
    <input type="hidden" name="paperid" value="6">
    <input type="radio" name="q77" value="1">
    <input type="radio" name="q77" value="2">
    <input type="text" name="q80">
</form> 

我考虑在AFHTTPClient中使用multipartFormRequestWithMethod,就像在帖子中使用AFNetworking发送多个图像时所讨论的那样.但我不知道如何使用"radio"类型的输入值附加表单数据.

Answer 1

以下是使用NSURLConnection发送POST参数的示例:

// Note that the URL is the "action" URL parameter from the form.
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.whereq.com:8079/answer.m"]];
[request setHTTPMethod:@"POST"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"content-type"];
//this is hard coded based on your suggested values, obviously you'd probably need to make this more dynamic based on your application's specific data to send
NSString *postString = @"paperid=6&q77=2&q80=blah";
NSData *data = [postString dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:data];
[request setValue:[NSString stringWithFormat:@"%u", [data length]] forHTTPHeaderField:@"Content-Length"];
[NSURLConnection connectionWithRequest:request delegate:self];

Answer 2

如果您在使用此表单(使用浏览器中的调试面板)时查看浏览器提交给服务器的内容,您会看到POST请求数据如下所示:

paperid=6&q77=2&q80=blah

也就是说,所选单选按钮的值条目用作相应POST条目的值,并且您只获得所有单选按钮的一个条目.(与切换按钮相反,您可以从中获取当前所选每个按钮的值.)

一旦理解了POST字符串的格式,就应该能够使用ASIFormDataRequest以通常的方式创建请求.