导入依赖

 #网络库dio: ^4.0.0

定义变量

// default optionsstatic const int _connectTimeout = 15000; //15sstatic const int _receiveTimeout = 15000;static const int _sendTimeout = 10000;static const String GET = 'get';static const String POST = 'post';static const String PUT = 'put';static const String PATCH = 'patch';static const String DELETE = 'delete';static var _dio;static HttpUtil? _httpUtil;static HttpUtil getInstance() => _httpUtil ??= HttpUtil();

创建Dio对象

 // 创建 dio 实例对象Dio _createInstance() {if (_dio == null) {/// 全局属性：请求前缀、连接超时时间、响应超时时间var options = BaseOptions(// responseType: ResponseType.json,baseUrl: HttpPath.BaseUrl,connectTimeout: _connectTimeout,receiveTimeout: _receiveTimeout,sendTimeout: _sendTimeout,);//拦截器var interceptor = InterceptorsWrapper(onRequest: (options,handler){print("\n================================= 请求数据 =================================");print("method = ${options.method.toString()}");print("url = ${options.uri.toString()}");print("headers = ${options.headers}");print("params = ${options.queryParameters}");return handler.next(options);},onResponse: (response,handler,){print("\n================================= 响应数据开始 =================================");print("code = ${response.statusCode}");print("data = ${response.data}");print("================================= 响应数据结束 =================================\n");return handler.next(response);},onError: (e,handler){print("\n=================================错误响应数据 =================================");print("type = ${e.type}");print("message = ${e.message}");print("stackTrace = ${e.stackTrace}");print("\n");return handler.next(e);});_dio = Dio(options);_dio.interceptors.add(interceptor);}return _dio;}

封装Get和Post请求

Future<T> get<T>(String url, FormData? param) async {return _requestHttp<T>(url,param: param,method: GET,);}Future<T> post<T>(String url, FormData param) async {return _requestHttp<T>(url,param: param,method: POST,);}

网络请求

_requestHttp<T>(String url, {param, method}) async {_dio = _createInstance();try {Response response = await _dio.request(url,data: param,options: Options(method: method));if (response.statusCode == 200) return response.data;} on DioError catch (e) {/// 打印请求失败相关信息print("【请求出错】${e.toString()}");rethrow;}}

释放dio对象

clear() {_dio = null;}

封装类

class HttpUtil {// default optionsstatic const int _connectTimeout = 15000; //15sstatic const int _receiveTimeout = 15000;static const int _sendTimeout = 10000;static const String GET = 'get';static const String POST = 'post';static const String PUT = 'put';static const String PATCH = 'patch';static const String DELETE = 'delete';static var _dio;static HttpUtil? _httpUtil;static HttpUtil getInstance() => _httpUtil ??= HttpUtil();// 创建 dio 实例对象Dio _createInstance() {if (_dio == null) {/// 全局属性：请求前缀、连接超时时间、响应超时时间var options = BaseOptions(// responseType: ResponseType.json,baseUrl: HttpPath.BaseUrl,connectTimeout: _connectTimeout,receiveTimeout: _receiveTimeout,sendTimeout: _sendTimeout,);//拦截器var interceptor = InterceptorsWrapper(onRequest: (options,handler){print("\n================================= 请求数据 =================================");print("method = ${options.method.toString()}");print("url = ${options.uri.toString()}");print("headers = ${options.headers}");print("params = ${options.queryParameters}");return handler.next(options);},onResponse: (response,handler,){print("\n================================= 响应数据开始 =================================");print("code = ${response.statusCode}");print("data = ${response.data}");print("================================= 响应数据结束 =================================\n");return handler.next(response);},onError: (e,handler){print("\n=================================错误响应数据 =================================");print("type = ${e.type}");print("message = ${e.message}");print("stackTrace = ${e.stackTrace}");print("\n");return handler.next(e);});_dio = Dio(options);_dio.interceptors.add(interceptor);}return _dio;}Future<T> get<T>(String url, FormData? param) async {return _requestHttp<T>(url,param: param,method: GET,);}Future<T> post<T>(String url, FormData param) async {return _requestHttp<T>(url,param: param,method: POST,);}/// T is Map<String,dynamic>  or List<dynamic>_requestHttp<T>(String url, {param, method}) async {_dio = _createInstance();try {Response response = await _dio.request(url,data: param,options: Options(method: method));if (response.statusCode == 200) return response.data;} on DioError catch (e) {/// 打印请求失败相关信息print("【请求出错】${e.toString()}");rethrow;}}// 清空 dio 对象clear() {_dio = null;}}

解析

使用一个插件JsonToDartBeanAction，建造一个新的实体类，只需将对应的Json字符串复制进去，然后它就会自动生成实体类和对应的解析类

使用

Future<List<ITopEntity>?> getTopList(int skip,int limit) async {var url = HttpPath.getTop250(skip, limit);final result = await HttpUtil.getInstance().get(url, null);return jsonConvert.convertListNotNull<ITopEntity>(result);
}

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Flutter——Dio网络库的使用与封装

Dio网络库的使用与封装

导入依赖

定义变量

创建Dio对象

封装Get和Post请求

网络请求

释放dio对象

封装类

解析

使用

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