//    //1、json转换成对象    //    NSString * path = [[NSBundle mainBundle] pathForResource:@"test.json" ofType:nil];    //    NSData * data = [NSData dataWithContentsOfFile:path];    //    NSDictionary * dic = [ NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];    //    NSArray * array = dic[@"class1"];    //        //    for (NSDictionary * dic in array)    //    {    //            //    //2.对象转成data    //        NSData * data = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:nil];    //        NSString * str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];    //        NSLog(@"%@", str);    //            //    }