篇首语：本文由小编为大家整理，主要介绍了如何用cmd从网络上下载文件相关的知识，希望对你有一定的参考价值。

如题。
具体命令为：下载http://example.com/example.exe到本地

从网络上下载省份城市名称并存入文件然后进行读取省份城市

//实现的功能是 从后台拿到城市的省份以及名称，然后保存在本地的沙盒中 在使用的时候再拿出来用。

步骤1

//向后台请求数据

 //忽略缓存    [RequestTools postJSONWithUrl:G.YB_GetZoneList parameters:@{} success:^(id responseObject) {        NSError *error = nil;        NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:&error];        if (error) {            NSLog(@"json error:%@",error);        } else {            if (![dic[@"code"] isEqualToString:@"GOOD"]) {                return;            }            if (![[dic objectForKey:@"content"] isKindOfClass:[NSNull class]]) {                //对数据进行解析                NSArray *provinces = [dic objectForKey:@"content"];                if (provinces.count > 0) {                    //重要代码                    [[AccountManager shareManager] cacheCitiesInfomation:provinces];                    _locationArray = [[AccountManager shareManager] getCitiesInfomation];                }            }                    }            } fail:^(id obj) {        NSLog(@"error:%@",obj);    }];

 步骤二：将解析到到的数据存起来

///缓存地区信息- (void)cacheCitiesInfomation:(NSArray *)provincesDic{    NSString *citiesPath = [self getPathWithFileName:@"cities.data"];    [provincesDic writeToFile:citiesPath atomically:YES];}

- (NSString *)getPathWithFileName:(NSString *)fileName{    NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];    return [path stringByAppendingPathComponent:fileName];}

 步骤三：从文件中读取信息

///读取地区信息- (NSArray *)getCitiesInfomation{    NSString *citiesPath = [self getPathWithFileName:@"cities.data"];    NSArray *provincesDic = [[NSArray alloc] initWithContentsOfFile:citiesPath];    if (provincesDic==nil || provincesDic.count==0) {        return nil;    }    NSMutableArray *provinces = [NSMutableArray array];    for (NSDictionary *proDic in provincesDic) {        FCZoneProvince *province = [[FCZoneProvince alloc] init];        province.provinceName = proDic[@"provinceName"];        //某一省下的所有市        NSArray *citiesDic = proDic[@"cities"];        NSMutableArray *cities = [NSMutableArray array];        for (NSDictionary *cityDic in citiesDic) {            FCZoneCity *city = [[FCZoneCity alloc] init];            city.cityName = cityDic[@"cityName"];            //某一城市下的所有区            NSArray *countriesDic = cityDic[@"counties"];            NSMutableArray *coutries = [NSMutableArray array];            for (NSDictionary *countryDic in countriesDic) {                FCZoneCountry *country = [[FCZoneCountry alloc] init];                country.countryName = countryDic[@"countyName"];                if ([country.countryName isEqualToString:@"市辖区"]) {                    continue;                }                [coutries addObject:country];            }            city.countries = coutries;            [cities addObject:city];        }        province.cities = cities;        [provinces addObject:province];    }    return provinces;}

 这样就获得了    provinces  and  cities

 在这里我只是提供一个这样的思路，有了思路估计很快就可以上手了吧。

以上是关于如何用cmd从网络上下载文件的主要内容，如果未能解决你的问题，请参考以下文章