iOS开发网络篇—发送json数据给服务器以及多值参数

 1 #import "YYViewController.h"
 2 
 3 @interface YYViewController ()
 4 
 5 @end
 6 
 7 @implementation YYViewController
 8 
 9 - (void)viewDidLoad
10 {
11     [super viewDidLoad];
12 }
13 
14 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
15 {
16     // 1.创建请求
17     NSURL *url = [NSURL URLWithString:@"http://192.168.1.200:8080/MJServer/order"];
18     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
19     request.HTTPMethod = @"POST";
20     
21     // 2.设置请求头
22     [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
23     
24     // 3.设置请求体
25     NSDictionary *json = @{
26                            @"order_id" : @"123",
27                            @"user_id" : @"789",
28                            @"shop" : @"Toll"
29                            };
30     
31 //    NSData --> NSDictionary
32     // NSDictionary --> NSData
33     NSData *data = [NSJSONSerialization dataWithJSONObject:json options:NSJSONWritingPrettyPrinted error:nil];
34     request.HTTPBody = data;
35     
36     // 4.发送请求
37     [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
38         NSLog(@"%d", data.length);
39     }];
40 }
41 
42 @end