JSON处理

<span style="font-family: Arial, Helvetica, sans-serif;">// 创建JSON对象</span>

- (void)createJsonObj{
NSNumber *age = [NSNumber numberWithInt:25];
NSDictionary *dic = [[NSDictionary alloc] initWithObjectsAndKeys:@"麦子",@"name",@"男",@"sex",age,@"age", @"六中",@"school",@"湖南",@"area", nil];

NSDictionary *dicA = [[NSDictionary alloc] initWithObjectsAndKeys:@"小麦子",@"name",@"男",@"sex",age,@"age", @"六中",@"school",@"湖南",@"area", nil];

NSArray *arrayData = [[NSArray alloc] initWithObjects:dic,dicA, nil];

// 字典数据转JSON
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:arrayData options:NSJSONWritingPrettyPrinted error:nil];
// 数据打印
NSString *str = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];

NSLog(@"%@",str);

}

// 解析JSON
- (void)preJSONData{
NSURL *url = [[NSURL alloc] initWithString:@"http://weather.com.cn/adat/cityinfo/101010100.html"];

NSURLRequest *request = [[NSURLRequest alloc] initWithURL:url];
NSData *requestData = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

//    NSString *str = [[NSString alloc] initWithData:requestData encoding:NSUTF8StringEncoding];

NSDictionary  *dic = [NSJSONSerialization JSONObjectWithData:requestData options:NSJSONReadingMutableLeaves error:nil];

// 对于返回的是数组的时候，就这样。 这个方法返回的是一个id类型
NSArray  *dicArray = [NSJSONSerialization JSONObjectWithData:requestData options:NSJSONReadingMutableLeaves error:nil];

NSDictionary *weatherDic = [dic objectForKey:@"weatherinfo"];
for (NSString *str in [weatherDic allKeys]) {
NSLog(@"%@---%@",str,[weatherDic objectForKey:str]);
}

}