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" : @"123456",
                           @"shop_name" : @"bowen",
                           @"user_id" : @"2012110606"
                           };
    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