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查备案怎么查询,seo外链工具下载,网站建设成功案例宣传,做传奇私服网站文章目录概念介绍使用方法示例代码我们在上一章回中介绍了dio库中转换器相关的内容，本章回中将介绍网络综合示例：获取天气信息.闲话休提，让我们一起Talk Flutter吧。概念介绍我们在前面章回中介绍了网络操作相关的内容，本章…

文章目录

概念介绍
使用方法
示例代码

我们在上一章回中介绍了dio库中转换器相关的内容，本章回中将介绍网络综合示例：获取天气信息.闲话休提，让我们一起Talk Flutter吧。

概念介绍

我们在前面章回中介绍了网络操作相关的内容，本章回中将综合利用这些内容实现一个获取天气信息的例子。主要包含dio库的使用、网络操作的封装和JSON数据解析这些内容。在实际项目中这些内容是网络内容中必备的内容，而且它们之间需要相互配合才能完成网络操作。

使用方法

导入dio包，并且对它进行封装，主要是网络请求参数和网络操作的封装；
在天气信息网站注册账号并且获取授权使用API的私钥,我注册的是心知天气；
依据API的操作说明配置与请求相关的参数，比如API的path和请求相关的参数；
依据API返回的内容，创建天气信息model类，为转换JSON数据做准备，可以借助插件完成；
使用Button类Widget,在它的onpress属性中发起获取天气信息的操作，然后通过日志打印出天气信息；

示例代码

///封装DIO网络库
///封装常用的网络参数
class HttpConfig {static const String BASE_URL = "https://api.seniverse.com";static const int TIME_OUT = 15;///对应天气实况// var TIAN_QI_SHI_KUANG = "https://api.seniverse.com/v3/weather/now.json?key=your_api_key&location=beijing&language=zh-Hans&unit=c";static const PATH_TIAN_QI_SHI_KUANG = "/v3/weather/now.json";///对应24小时逐小时天气预报// var HOUR24 = "https://api.seniverse.com/v3/weather/hourly.json?key=your_api_key&location=beijing&language=zh-Hans&unit=c&start=0&hours=24";static const PATH_HOUR24 = "/v3/weather/hourly.json";///对应未来15天逐日天气预报和和昨日天气，不过免费的key只能获取3天的天气预报// var FORECAST_DAYS = "https://api.seniverse.com/v3/weather/daily.json?key=your_api_key&location=beijing&language=zh-Hans&unit=c&start=0&days=3";static const PATH_FORECAST_DAYS = "/v3/weather/daily.json";
}class HttpRequest {static final baseOptions = BaseOptions(baseUrl: HttpConfig.BASE_URL,connectTimeout: Duration(seconds: HttpConfig.TIME_OUT),sendTimeout: Duration(seconds: HttpConfig.TIME_OUT),receiveTimeout: Duration(seconds: HttpConfig.TIME_OUT),);static final mdio = Dio(baseOptions);
///把网络操作相关的功能封装成独立的方法，网络操作相关的数据通过url和params参数传递static Future<T> request<T>(String url,{String method='get',required Map<String,dynamic> params,Interceptor? interceptor,}) async {final option = Options(method: method);///添加拦截器Interceptor _interceptor = InterceptorsWrapper(onRequest: (options,handler) {return handler.next(options);},onResponse: (response,handler){print('response: ' + response.toString());return handler.next(response);},onError: (error,handler) {print('response: ' + error.toString());return handler.next(error);},);mdio.interceptors.add(_interceptor);///默认也会抛出异常，这里只用来捕获特定的异常try {Response response = await mdio.request(url, queryParameters: params, options: option);return response.data;}on DioException catch (e) {print(e.toString());return Future.error(e);}}
}///获取天气信息，网络框架使用httpRequest,请求参数使用map添加
_getWeatherInfo() async {var url = HttpConfig.BASE_URL+HttpConfig.PATH_TIAN_QI_SHI_KUANG;Map<String,String> queryParams = {};queryParams['key'] = PrivateKey.key;queryParams['location'] = 'beijing';queryParams['language'] = 'zh-Hans';queryParams['unit'] = 'c';TestRequest _testRequest = TestRequest();_testRequest.addRequestParams('key',PrivateKey.key).addRequestParams('location', 'beijing').addRequestParams('language', 'zh-Hans').addRequestParams('unit', 'c');HttpRequest.request(url, params: queryParams).then((value){debugPrint(XZWeatherBeanEntity.fromJson(value).toString());XZWeatherBeanEntity.fromJson(value).results?.forEach((element) {print("now: ${element.now}");});});
}///获取天气信息，网络框架使用httpRequest,请求参数使用map添加
_getWeatherInfo() async {var url = HttpConfig.BASE_URL+HttpConfig.PATH_TIAN_QI_SHI_KUANG;Map<String,String> queryParams = {};queryParams['key'] = PrivateKey.key;queryParams['location'] = 'beijing';queryParams['language'] = 'zh-Hans';queryParams['unit'] = 'c';TestRequest _testRequest = TestRequest();_testRequest.addRequestParams('key',PrivateKey.key).addRequestParams('location', 'beijing').addRequestParams('language', 'zh-Hans').addRequestParams('unit', 'c');HttpRequest.request(url, params: queryParams).then((value){debugPrint(XZWeatherBeanEntity.fromJson(value).toString());XZWeatherBeanEntity.fromJson(value).results?.forEach((element) {print("now: ${element.now}");});});
}ElevatedButton(onPressed: () {debugPrint('get weather button clicked');_getWeatherInfo();},child: Text('get weather by HttpRequest'),
),