iOS开发网络篇—发送json数据给服务器以及多值参数

#import "YYViewController.h"

@interface YYViewController ()

@end

@implementation YYViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    // 1.创建请求
    NSURL *url = [NSURL URLWithString:@"http://192.168.1.200:8080/MJServer/order"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    request.HTTPMethod = @"POST";
    
    // 2.设置请求头
    [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    
    // 3.设置请求体
    NSDictionary *json = @{
                           @"order_id" : @"123",
                           @"user_id" : @"789",
                           @"shop" : @"Toll"
                           };
    
//    NSData --> NSDictionary
    // NSDictionary --> NSData
    NSData *data = [NSJSONSerialization dataWithJSONObject:json options:NSJSONWritingPrettyPrinted error:nil];
    request.HTTPBody = data;
    
    // 4.发送请求
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
        NSLog(@"%d", data.length);
    }];
}

@end