需要将JSON格式的数据传送给服务器，注意需要设置： [request setValue:@”application/json” forHTTPHeaderField:@”Content-Type”];
Content-Type类型为：application/json
// 1.URL
NSURL *url = [NSURL URLWithString:@"http://localhost:8080/MJServer/order"];// 2.请求
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];// 3.请求方法
request.HTTPMethod = @"POST";// 4.设置请求体（请求参数）
// 创建一个描述订单信息的JSON数据
NSDictionary *orderInfo = @{@"shop_id" : @"1243324",@"shop_name" : @"啊哈哈哈",@"user_id" : @"899"};
NSData *json = [NSJSONSerialization dataWithJSONObject:orderInfo options:NSJSONWritingPrettyPrinted error:nil];
request.HTTPBody = json;// 5.设置请求头：这次请求体的数据不再是普通的参数，而是一个JSON数据
[request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];// 6.发送请求
[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {if (data == nil || connectionError) return;NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:nil];NSString *error = dict[@"error"];if (error) {[MBProgressHUD showError:error];} else {NSString *success = dict[@"success"];[MBProgressHUD showSuccess:success];}
}];
)
)
