如何使用NSURLRequest在Http请求中发送json数据

如何使用NSURLRequest在Http请求中发送json数据

这是我的工作（请注意，发送到我的服务器的JSON必须是一个字典，其中包含key = question..ie {：question =>
{dictionary}}}的一个值（另一个字典））：

NSArray *objects = [NSArray arrayWithObjects:[[NSUserDefaults standardUserDefaults]valueForKey:@"StoreNickName"],  [[UIDevice currentDevice] uniqueIdentifier], [dict objectForKey:@"user_question"],     nil];NSArray *keys = [NSArray arrayWithObjects:@"nick_name", @"UDID", @"user_question", nil];NSDictionary *questionDict = [NSDictionary dictionaryWithObjects:objects forKeys:keys];NSDictionary *jsonDict = [NSDictionary dictionaryWithObject:questionDict forKey:@"question"];NSString *jsonRequest = [jsonDict JSONRepresentation];NSLog(@"jsonRequest is %@", jsonRequest);NSURL *url = [NSURL URLWithString:@"https://xxxxxxx.com/questions"];NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url  cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];NSData *requestData = [jsonRequest dataUsingEncoding:NSUTF8StringEncoding];[request setHTTPMethod:@"POST"];[request setValue:@"application/json" forHTTPHeaderField:@"Accept"];[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];[request setValue:[NSString stringWithFormat:@"%d", [requestData length]] forHTTPHeaderField:@"Content-Length"];[request setHTTPBody: requestData];NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];if (connection) { receivedData = [[NSMutableData data] retain];}

然后，receivedData由以下方式处理：

NSString *jsonString = [[NSString alloc] initWithdata:data encoding:NSUTF8StringEncoding];NSDictionary *jsonDict = [jsonString JSONValue];NSDictionary *question = [jsonDict objectForKey:@"question"];

这不是100％清楚的，需要重新阅读，但是所有内容都应该在这里，以帮助您入门。据我所知，这是异步的。进行这些调用时，我的UI未被锁定。希望有帮助。