json数据格式原生解析器

心已赠人 2023-10-17 06:14 7阅读 0赞

请求服务器返回数据格式无非就是两种：json和XML，这篇讲解原生如何解析json格式数据

- (void)viewDidLoad
    {
        [super viewDidLoad];
    	
        _data = [[NSMutableData alloc]init];
        //判断token有没有过期
        NSDate *endDate = [USER_D objectForKey:@"endDate"];
        NSDate *nowDate = [NSDate date];
        //比较现在时间和过去时间  ascend ,上升
        if ([nowDate compare:endDate] == NSOrderedAscending)
        {
            //token没有过期
            FriendsListVC *vc = [[FriendsListVC alloc]init];
            [self.navigationController pushViewController:vc animated:YES];
            [vc release];
        }
        else
        {
            //token过期
        }
    }
    
    - (IBAction)login:(UIButton *)sender
    {
        NSURL *url = [NSURL URLWithString:@"http://127.0.0.1:8080/st/s"];
        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
        NSString *string = [NSString stringWithFormat:@"command=ST_L&name=%@&psw=%@",_nameField.text,_pwdField.text];
        NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
        [request setHTTPBody:data];
        [request setHTTPMethod:@"POST"];
        
        NSURLConnection *connetion = [NSURLConnection connectionWithRequest:request delegate:self];
        [connetion start];
    }
    
    - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
    {
        NSLog(@"失败：%@",error);
    }
    
    - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
    {
        [_data setData:[NSData data]];
    }
    
    - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
    {
        [_data appendData:data];
    }
    
    - (void)connectionDidFinishLoading:(NSURLConnection *)connection
    {
        NSString *string = [[NSString alloc]initWithData:_data encoding:NSUTF8StringEncoding];
        NSLog(@"%@",string);
        NSLog(@"%@",_data);
        
        //NSJSONSerialization JSON解析器
        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:_data options:NSJSONReadingMutableContainers error:nil];
        if ([[dic objectForKey:@"result"]integerValue] == 1)
        {
            //登录成功
            //access_token ⽤用户⾝身份验证通过返回的唯⼀一标⽰示⽤用户⾝身份的字段
            //将token保存起来，用于之后调用需要登录验证的接口
            [USER_D setObject:[dic objectForKey:@"access_token" ] forKey:@"token"];
            //计算过期时间
            NSDate *nowDate = [NSDate date];
            //dateByAddingTimeInterval  计算一个时间点加上一段时间后的时间点
            NSDate *endDate = [nowDate dateByAddingTimeInterval:[[dic objectForKey:@"time"] integerValue]];
            //存储过期时间
            [USER_D setObject:endDate forKey:@"endDate"];
            [USER_D synchronize];
            
            FriendsListVC *vc = [[FriendsListVC alloc]init];
            [self.navigationController pushViewController:vc animated:YES];
            [vc release];
        }
        else
        {
            SHOW_ALERT([dic objectForKey:@"error"]);
        }
        
        [string release];
    }
    
    - (IBAction)regist:(UIButton *)sender
    {
        RegistVC *vc = [[RegistVC alloc]init];
        [self.navigationController pushViewController:vc animated:YES];
        [vc release];
    }

可以和XML格式对比一下

[XML数据格式原生解析器][XML]

[XML]: http://blog.csdn.net/minggeqingchun/article/details/51815868