json数据格式原生解析器

- (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];
}