IOS-网络(发送JSON数据给服务器和多值参数）

三步走：

1.使用POST请求

2.设置请求头

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

3.设置JSON数据为请求体

 //
 //  ViewController.m
 //  IOS_0130_发送JSON给服务器
 //
 //  Created by ma c on 16/1/30.
 //  Copyright © 2016年 博文科技. All rights reserved.
 //

 #import "ViewController.h"
 #import "MBProgressHUD+MJ.h"

 @interface ViewController ()

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     self.view.backgroundColor = [UIColor cyanColor];
     // Do any additional setup after loading the view, typically from a nib.
 }

 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
 {
     //发送JSON数据给服务器
     //[self sendJSON];
     //多值参数
     [self multiValueParameter];

 }
 ///多值参数
 - (void)multiValueParameter
 {
     //1.URL
     NSURL *url = [NSURL URLWithString:@"http://localhost:8080/MJServer/weather"];
     //2.请求
     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
     //3.请求方法
     request.HTTPMethod = @"POST";
     //4.设置请求体
     NSMutableString *param = [NSMutableString string];
     [param appendString:@"place=BeiJing&place=TianJin&place=AnHui"];
 //    [param appendString:@"&place=TianJin"];
 //    [param appendString:@"&place=AnHui"];
     request.HTTPBody = [param dataUsingEncoding:NSUTF8StringEncoding];

     //5.发送请求
     [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable 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{
             NSArray *weathers = dict[@"weathers"];
             NSLog(@"%@",weathers);
         }
     }];
 }
 ///发送JSON数据给服务器
 - (void)sendJSON
 {
     //1.URL
     NSURL *url = [NSURL URLWithString:@"http://localhost:8080/MJServer/order"];
     //2.请求
     NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
     //3.请求方法
     request.HTTPMethod = @"POST";
     //4.设置请求体
     //创建一个描述订单信息的JSON数据
     NSDictionary *dict = @{
                            @"shop_id" : @"",
                            @"shop_name" : @"bowen",
                            @"user_id" : @""
                            };
     NSData *json = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:nil];
     request.HTTPBody = json;

     //5.设置请求头：这次请求体的数据不再是参数，而是JSON数据 value:MIMEType
     [request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

     //6.发送请求
     [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable 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];
         }
     }];
 }
 @end