异步POST请求解析JSON

异步POST请求解析JSON

一、创建URL

NSURL
*url = [NSURL
URLWithString:@"http://localhost:8080/MJServer/order"];

   

二、创建一个请求

NSMutableURLRequest
*request = [NSMutableURLRequest
requestWithURL:url];

   

三、设置请求方法

request.HTTPMethod
=
@"POST";

   

五、设置请求体（请求參数）

//
创建一个描写叙述订单信息的JSON数据

NSMutableDictionary
*orderInfo =
[NSMutableDictionary
dictionary];

orderInfo[@"shop_id"]
=
@"123”;

orderInfo[@"shop_name"]
=
@"123";

orderInfo[@"user_id"]
=
@"123";

// 将字典转化成data

NSData
*bodyData= [NSJSONSerialization
dataWithJSONObject:orderInfo
options:NSJSONWritingPrettyPrinted
error:nil];

request.HTTPBody
= bodyData;

   

六、设置请求头：这次请求体的数据不再是普通的參数。而是一个JSON数据

[request
setValue:@"application/json"
forHTTPHeaderField:@"Content-Type"];

   

七、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];

   }

}];

注意：

 [NSJSONSerialization dataWithJSONObject:orderInfo options:NSJSONWritingPrettyPrinted error:nil]

将JSON转化成二进制数据

[NSJSONSerialization
JSONObjectWithData:data
options:NSJSONReadingMutableLeaves
error:nil];

将二进制数据转成JSON

设置请求头：这次请求体的数据不再是普通的參数，而是一个JSON数据

[request setValue:@"application/json"
forHTTPHeaderField:@"Content-Type"];