JSON Retrive from server

Format 1:

NSError *er;

NSDictionary  *Dic=[NSJSONSerialization JSONObjectWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"someURL"]]] options:NSJSONReadingMutableContainers error:&er];

Format 2:

NSString *urlString = [NSString stringWithFormat:@"%@loadPeople",ServiceUrl];

    NSURL *url = [NSURL URLWithString:urlString];

    NSData *data1 =[NSData dataWithContentsOfURL:url];

    NSString *json_string = [[NSString alloc] initWithData:data1 encoding:NSUTF8StringEncoding];

    

   // NSLog(@"json_string:%@",json_string);

    

       NSDictionary *dicc= (NSDictionary *) [parser objectWithString:json_string error:nil];

FORMAT3:

 NSURL *url = [NSURL URLWithString:urlString];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    [request setHTTPMethod: @"POST"];

    [request setValue:@"application/json" forHTTPHeaderField:@"Accept"];

    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];

    //NSString *myRequestString = [NSString stringWithFormat:@"countryId=1"];

    NSString *myRequestString = [NSString stringWithFormat:@"countryId=%@",countryId];

    //NSLog(@"test:%@",myRequestString);

    // [myRequestString stringByAppendingString:myParamString];

    NSData *requestData = [NSData dataWithBytes:[myRequestString UTF8String] length:[myRequestString length]];

    [request setHTTPBody: requestData];

 NSHTTPURLResponse* response =[[NSHTTPURLResponse alloc] init];

    NSError* error = [[NSError alloc] init] ;

    

    NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&responseerror:&error];

    if (error)

    {

        

    }

    

    NSString *responseString = [[NSString alloc] initWithBytes:[responseData bytes]

                                                        length:[responseData length]

                                                      encoding:NSUTF8StringEncoding];

    //NSLog(@"responseString:%@", responseString);

    

//    NSString *response1 = [[NSString alloc] initWithData:receivedData encoding:NSUTF8StringEncoding];

//    NSLog(@"response:%@",response1);

    

    SBJsonParser *parser = [[SBJsonParser alloc]init];

       

    NSMutableArray jason_array=[parser objectWithString:responseString];