在iphone的post request中发送json数据

Question

我试图在post请求发送JSON数据到服务器抛出错误。我正在创建以下格式的数据

      NSDictionary *o1 = [[NSMutableDictionary alloc] init];
        [o1 setValue:@"51" forKey:@"merchantProductId"];
        [o1 setValue:@"Big Paulie" forKey:@"name"];
        [o1 setValue:@"1" forKey:@"quantity"];
        NSDictionary *o2 = [[NSMutableDictionary alloc] init];
        [o2 setValue:@"52" forKey:@"merchantProductId"];
        [o2 setValue:@"Paulie" forKey:@"name"];
        [o2 setValue:@"10" forKey:@"quantity"];
        NSMutableArray *pizzas = [NSMutableArray arrayWithObjects:o1, o2, nil];
        NSDictionary *o3 = [[NSMutableDictionary alloc] init];
        [o3 setValue:@"3" forKey:@"merchantId"];
        [o3 setValue:pizzas forKey:@"pizzas"];
        NSMutableArray *orderArray = [NSMutableArray arrayWithObjects:o3, nil];
        NSData *jsData = [NSJSONSerialization dataWithJSONObject:orderArray options:NSJSONWritingPrettyPrinted error:nil];
 NSString *data = [NSString stringWithFormat:@"data=%@",[[NSString alloc] initWithData:jsData                                                                                 encoding:NSUTF8StringEncoding]];
       NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];
    [request setURL:[NSURL URLWithString:[NSString stringWithFormat:@"http:61.12.124.234:60/upload_image/phoneTesting.php"]]];
    [request setHTTPMethod:@"POST"];
   // [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request setValue:[NSString stringWithFormat:@"%d", [requestData length]] forHTTPHeaderField:@"Content-Length"];
    [request setHTTPBody:postData];
    NSHTTPURLResponse* urlResponse = nil;
    error = [[NSError alloc] init];
    NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];
    NSString *result = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
    NSLog(@"Response: %@", result);

在服务器中，我需要的数据应该呈现为

      {
    "pizzas" : [
      {
        "quantity" : "1",
        "merchantProductId" : "51",
        "name" : "Big Paulie"
      },
      {
        "quantity" : "10",
        "merchantProductId" : "52",
        "name" : "Paulie"
      }
    ],
    "merchantId" : "3"
  }

但是我得到

(
    [data] => [
  {
    "pizzas" : [
      {
        "quantity" : "1",
        "merchantProductId" : "51",
        "name" : "Big Paulie"
      },
      {
        "quantity" : "10",
        "merchantProductId" : "52",
        "name" : "Paulie"
      }
    ],
    "merchantId" : "3"
  }
]
)

，当我试图只发送jsData，它不发送任何东西与请求。

请建议我如何发送post请求中唯一的json数据。

我使用xcode4.5

Answer 1

我想知道你为什么做下面这行:

NSString *data = [NSString stringWithFormat:@"data=%@", 
    [[NSString alloc] initWithData:jsData encoding:NSUTF8StringEncoding]];

如果它是一个GET请求，那么你需要一个键值配对，但你只是发送POST数据，不需要键。

我想这就是为什么你会得到那个目空一切的[data] = entry。如果你做到了:

NSString *data = [NSString stringWithFormat:@"%@",
    [[NSString alloc] initWithData:jsData encoding:NSUTF8StringEncoding]];

Answer 2

在我看来，你在这一行序列化了错误的对象:

NSData *jsData = [NSJSONSerialization dataWithJSONObject:orderArray
  options:NSJSONWritingPrettyPrinted error:nil];

为什么要序列化包含字典的数组?当然，你应该只序列化字典本身。

NSData *jsData = [NSJSONSerialization dataWithJSONObject:o3
  options:NSJSONWritingPrettyPrinted error:nil];