How to send POST data using JSON in iOS? - ios

Question

I tried to add an entry to db using a POST request in Objectve-C. My service is:
#RequestMapping(method = RequestMethod.POST, headers = "content-type=application/json")
public
#ResponseBody
boolean addEmployee(#ModelAttribute User user) {
try {
logger.log(Level.INFO, user.getCountry());
userDataService.addUser(user);
return true;
//return new Status(1, "Employee added Successfully !");
} catch (Exception e) {
e.printStackTrace();
return false;//new Status(0, e.toString());
}
}
When I try this on Postman, it's working fine with x-www-form-urlencoded. But when I try this in Objective-C, nothing happens. Here is what I tried:
NSString *jsonInputString = #"{\"userName\":\"abcd\"}";
NSString *jsonRequest = jsonInputString;
NSLog(#"jsonRequest is %#", jsonRequest);
NSURL *url = [NSURL URLWithString:#"http://localhost:8080/user"];
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
NSMutableURLRequest *rq = [NSMutableURLRequest requestWithURL:url];
[rq setHTTPMethod:#"POST"];
NSData *jsonData = [jsonInputString dataUsingEncoding:NSUTF8StringEncoding];
[rq setHTTPBody:jsonData];
[rq setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[rq setValue:[NSString stringWithFormat:#"%ld", (long)[jsonData length]] forHTTPHeaderField:#"Content-Length"];
[NSURLConnection sendAsynchronousRequest:rq queue:queue completionHandler:^(NSURLResponse *response, NSData *data, NSError *error)
{
NSLog(#"%#", [error localizedDescription]);
}];
In completion block, the log prints "Could not connect to the server". How can I call the service with JSON data?

Answer 1

Something like this should work
// 1: Create your URL, Session config and Session
NSString *jsonInputString = #"{\"userName\":\"abcd\"}";
NSString *jsonRequest = jsonInputString;
NSURL *url = [NSURL URLWithString:#"http://localhost:8080/user"];
NSURLSessionConfiguration *config =
[NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:config];
// 2: Create NSMutableRequest object
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
request.HTTPMethod = #"POST";
// 3: Create Jsondata object
NSError *error = nil;
NSData *jsonData = [jsonInputString dataUsingEncoding:NSUTF8StringEncoding];
// Asynchronously Api is hit here
NSURLSessionUploadTask *dataTask =
[session uploadTaskWithRequest:request
fromData:data
completionHandler:^(NSData *data, NSURLResponse *response,
NSError *error) {
NSLog(#"%#", data);
NSDictionary *json =
[NSJSONSerialization JSONObjectWithData:data
options:0
error:nil];
NSLog(#"%#", json);
success(json);
}];
[dataTask resume]; // Executed First