本文主要是介绍[Flutter3] 记录Dio的简单封装(一)，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
文章目录
- 效果
- 使用
- ResponseEntity类
- DioManager封装
- _onResponse / _onDioException 的设计
- Response的处理
- catch处理
效果
请求成功/失败/异常的日志输出效果
成功:
失败:500
失败:404
网络异常:
使用
举个使用的例子, 在调用 DioManager的时候, 直接通过返回值的状态, 来处理各个情况,不用在 try{}catch{}里面各写一遍处理逻辑,
比如上图,就是直接调用的封装的API
ResponseEntity res = await DioManager().requestGet(HttpApi.user_record, param: {"openid": "okqbz5K-4UoymmukFtxyQAyImKm0","uid": "88030","subject": '20',"unionid": "ofJJv6M45ChFhuUZyVaLXwt07M4g",});res.toLog();
直接同步获取了请求的结果,通过 ResponseEntity 来处理本次请求的各项情况(如上4图)
ResponseEntity类
提供了 泛型T的data属性,
提供了 tag, 用于处理请求的不同情况
提供了 toString/ toLog函数 , 用于查看请求/返回/状态码/请求参数等
class ResponseEntity<T> {/// 常规的response.data的返回字段late String? msg;late int? code;T? data;/// response.data中,自定以追加的一些字段(方便日志查看)late int? tag; // 业务tag 0=>通信OK+业务未跑通 1=>通信OK+业务跑通 2=>通信失败(各类原因...) 9=>解析/socket等异常late String? method; // 请求的 methodlate String? baseUrl; // 请求的host地址 - 方便打印日子产看环境late String? path; // 请求地址late String? desc; // 自定义的报文描述-便于判断请求情况late Map<String, dynamic>? queryParameters; // 请求的参数ResponseEntity(this.code, this.msg, this.data, this.tag, this.method, this.baseUrl, this.path, this.desc, this.queryParameters);ResponseEntity.initFromJson(Map<String, dynamic> jsonMap) {code = jsonMap.containsKey(ConstantUtil.code) ? jsonMap[ConstantUtil.code] as int? : 0;msg = jsonMap.containsKey(ConstantUtil.msg) ? jsonMap[ConstantUtil.msg] as String? : "";// 存在dataif (jsonMap.containsKey(ConstantUtil.data)) {data = jsonMap[ConstantUtil.data] as T;}/// response自定以追加的一些字段处理tag = jsonMap.containsKey(ConstantUtil.tag) ? jsonMap[ConstantUtil.tag] : 9;method = jsonMap.containsKey(ConstantUtil.method) ? jsonMap[ConstantUtil.method] : "";baseUrl = jsonMap.containsKey(ConstantUtil.baseUrl) ? jsonMap[ConstantUtil.baseUrl] : "";path = jsonMap.containsKey(ConstantUtil.path) ? jsonMap[ConstantUtil.path] : "";queryParameters = jsonMap.containsKey(ConstantUtil.queryParameters) ? jsonMap[ConstantUtil.queryParameters] : null;desc = jsonMap.containsKey(ConstantUtil.desc) ? jsonMap[ConstantUtil.desc] : "";}/// 手动重写toString 方法,方便查看日志@overrideString toString() {var _code = "code:$code\n";var _msg = "msg:$msg\n";var _data = json.encode(data).toString();var _dataString = "data:$_data\n";var _tag = "tag:$tag\n";var _method = "method:$method\n";var _baseUrl = "baseUrl:$baseUrl\n";var _path = "path:$path\n";var _desc = "path:$desc\n";var _queryParameters = jsonEncode(queryParameters);var _queryParametersString = "queryParameters:$_queryParameters\n";return _code + _msg + _dataString + _tag + _method + _baseUrl + _path + _desc + _queryParametersString;}/// 提供自带的打印函数void toLog() {LoggerUtil().d(toString());}
}
DioManager封装
对DioManager进行单例模式处理
/// dio管理类的单例的实现 --------------------------------------------------// 定义私有管理对象 _singletonstatic final DioManager _singleton = DioManager._();// 私有对象构造实现DioManager._() {// dio初始化 - 配置全局options - 具体事项先省略}// 声明并完成初始化的私有变量(_singleton),// 通过 DioManager的工厂函数(factory关键字) ,进行单例模式返回factory DioManager() => _singleton;
提供_request通用方法
/// request 通用处理函数 -----------------------------------------------------------/// get 对应的是 queryParam/// post 对应的是 data/// 通过 对 try/catch 的处理, 均异步返回有效的 BaseResponseEntity<T> 实例,/// 外部调用时候,仅获取数据是, 可以不必包裹 try/catch,Future<ResponseEntity<T>> _request<T>(String method,String apiPath, {Map<String, dynamic>? param,CancelToken? cancelToken,Options? options,}) async {try {// 通用请求Response<dynamic> response = await _dio.request(apiPath,data: param, queryParameters: param, cancelToken: cancelToken, options: _loadOptions(method, options));// 通过 _onResponse()函数转换response// 自定义返回的data内容, 除了原有的 code/msg/data信息, 新增desc/tag等返回数据response = _onResponse(response);return ResponseEntity<T>.initFromJson(response.data);} on DioException catch (err) {// 通过对DioException的解析,返回自定义的BaseResponseEntity实例return _onDioException(err) as ResponseEntity<T>;}}_onResponse / _onDioException 的设计
根据Request的情况, 把交互场景分为了四类
1&2: statusCode == 200 , 再区分业务code是否OK
3: statusCode !==200, 可能是 404 /500 等情况
4: 断网等异常情况
其中 1&2&3, 都是通过_onResponse处理
4通过_onDioException处理, 这里的catch不再直接抛出, 用ResponseEntity来统一做返回格式处理
(DioException)
Response的处理
class ResponseEntity<T> {/// 常规的response.data的返回字段late String? msg;late int? code;T? data;/// response.data中,自定以追加的一些字段(方便日志查看)late int? tag; // 业务tag 0=>通信OK+业务未跑通 1=>通信OK+业务跑通 2=>通信失败(各类原因...) 9=>解析/socket等异常late String? method; // 请求的 methodlate String? baseUrl; // 请求的host地址 - 方便打印日子产看环境late String? path; // 请求地址late String? desc; // 自定义的报文描述-便于判断请求情况late Map<String, dynamic>? queryParameters; // 请求的参数ResponseEntity(this.code, this.msg, this.data, this.tag, this.method, this.baseUrl, this.path, this.desc, this.queryParameters);ResponseEntity.initFromJson(Map<String, dynamic> jsonMap) {code = jsonMap.containsKey(ConstantUtil.code) ? jsonMap[ConstantUtil.code] as int? : 0;msg = jsonMap.containsKey(ConstantUtil.msg) ? jsonMap[ConstantUtil.msg] as String? : "";// 存在dataif (jsonMap.containsKey(ConstantUtil.data)) {data = jsonMap[ConstantUtil.data] as T;}/// response自定以追加的一些字段处理tag = jsonMap.containsKey(ConstantUtil.tag) ? jsonMap[ConstantUtil.tag] : 9;method = jsonMap.containsKey(ConstantUtil.method) ? jsonMap[ConstantUtil.method] : "";baseUrl = jsonMap.containsKey(ConstantUtil.baseUrl) ? jsonMap[ConstantUtil.baseUrl] : "";path = jsonMap.containsKey(ConstantUtil.path) ? jsonMap[ConstantUtil.path] : "";queryParameters = jsonMap.containsKey(ConstantUtil.queryParameters) ? jsonMap[ConstantUtil.queryParameters] : null;desc = jsonMap.containsKey(ConstantUtil.desc) ? jsonMap[ConstantUtil.desc] : "";}/// 手动重写toString 方法,方便查看日志@overrideString toString() {var _code = "code:$code\n";var _msg = "msg:$msg\n";var _data = json.encode(data).toString();var _dataString = "data:$_data\n";var _tag = "tag:$tag\n";var _method = "method:$method\n";var _baseUrl = "baseUrl:$baseUrl\n";var _path = "path:$path\n";var _desc = "path:$desc\n";var _queryParameters = jsonEncode(queryParameters);var _queryParametersString = "queryParameters:$_queryParameters\n";return _code + _msg + _dataString + _tag + _method + _baseUrl + _path + _desc + _queryParametersString;}/// 提供自带的打印函数void toLog() {LoggerUtil().d(toString());}
}catch处理
/// 对 DioException进行解析,基本覆盖大部分错误类型了ResponseEntity _onDioException(DioException err) {var errType = err.type;var path = err.requestOptions.path;var data = err.requestOptions.data;var queryParameters = err.requestOptions.queryParameters;var baseUrl = err.requestOptions.baseUrl;var method = err.requestOptions.method;ResponseEntity baseResponseEntity = ResponseEntity(0, "", data, 9, method, baseUrl, path, "", queryParameters);///连接超时if (errType == DioExceptionType.connectionTimeout) {baseResponseEntity.msg = "连接超时";baseResponseEntity.desc = "连接超时";}///发送超时if (errType == DioExceptionType.sendTimeout) {baseResponseEntity.msg = "发送超时";baseResponseEntity.desc = "发送超时";}///接收超时if (errType == DioExceptionType.receiveTimeout) {baseResponseEntity.msg = "接收超时";baseResponseEntity.desc = "接收超时";}///证书损坏if (errType == DioExceptionType.badCertificate) {baseResponseEntity.msg = "证书损坏";baseResponseEntity.desc = "证书损坏";}///返回内容问题if (errType == DioExceptionType.badResponse) {baseResponseEntity.msg = "返回内容问题";baseResponseEntity.desc = "返回内容问题";}///请求取消if (errType == DioExceptionType.cancel) {baseResponseEntity.msg = "请求取消";baseResponseEntity.desc = "请求取消";}///连接错误-无网络if (errType == DioExceptionType.connectionError) {baseResponseEntity.msg = "连接错误-无网络";baseResponseEntity.desc = "连接错误-无网络";}///未知错误if (errType == DioExceptionType.unknown) {baseResponseEntity.msg = "未知错误";baseResponseEntity.desc = "未知错误";}return baseResponseEntity;}针对ResponseEntity中, T? data 的处理, 稍后补上, 先走通请求…
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