一个关于字典和数组混合的多层多层次数据转化为JSON数据处理方法

-(NSString *)getJSONStringFromObj:(id)obj {
    NSLog(@"%@",[[obj class] description]);
    SBJSON *json = [[[SBJSON alloc] init] autorelease];
    if ([obj isKindOfClass:[NSArray class]]) {
        NSMutableArray *mt_array = [NSMutableArray array];
        NSArray *t_array = (NSArray *)obj;
        for (id t_obj in t_array) {
            if ([t_obj isKindOfClass:[NSString class]]) {
                [mt_array addObject:(NSString *)t_obj];
            } else {
                NSString *jsonStr = [self getJSONStringFromObj:t_obj];
                [mt_array addObject:jsonStr];
            }
        }
        return [json stringWithObject:mt_array error:nil];
    } else if ([obj isKindOfClass:[NSDictionary class]]) {
        NSDictionary *t_dict = (NSDictionary *)obj;
        NSMutableDictionary *mt_dict = [NSMutableDictionary dictionary];
        NSArray *keys = [t_dict allKeys];
        for (NSString *key in keys) {
            id t_obj = [t_dict objectForKey:key];
            if ([t_obj isKindOfClass:[NSString class]]) {
                [mt_dict setObject:t_obj forKey:key];
            } else {
                NSString *jsonStr = [self getJSONStringFromObj:t_obj];
                [mt_dict setObject:jsonStr forKey:key];
            }
        }
        return [json stringWithObject:mt_dict error:nil];
    } else if ([obj isKindOfClass:[NSString class]]) {
        return obj;
    } else {
        return [[obj class] description];
    }
}