如何在Flutter中实现Dio的二次封装
如何在Flutter中实现Dio的二次封装?相信很多没有经验的人对此束手无策,为此本文总结了问题出现的原因和解决方法,通过这篇文章希望你能解决这个问题。
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目录:
DioManager:Dio辅助类NWMethod:请求方法,get、post等
NWApi:大家都知道
EntityFactory:json转换辅助工厂,把json转为T
BaseEntity
:数据基类,返回的参数为 {“code”: 0, “message”: “”, “data”: {}} BaseListEntity
:数据基类2,返回的参数为 {“code”: 0, “message”: “”, “data”: []} ErrorEntity:请求报错基类,{“code”: 0, “message”: “”}
EntityFactory:
class EntityFactory { static T generateOBJ(json) { if (json == null) { return null; } //可以在这里加入任何需要并且可以转换的类型,例如下面 // else if (T.toString() == "LoginEntity") { // return LoginEntity.fromJson(json) as T; // } else { return json as T; } } }
BaseEntity:
class BaseEntity{ int code; String message; T data; BaseEntity({this.code, this.message, this.data}); factory BaseEntity.fromJson(json) { return BaseEntity( code: json["code"], message: json["msg"], // data值需要经过工厂转换为我们传进来的类型 data: EntityFactory.generateOBJ (json["data"]), ); } }
BaseListEntity:
class BaseListEntity{ int code; String message; List data; BaseListEntity({this.code, this.message, this.data}); factory BaseListEntity.fromJson(json) { List mData = List(); if (json['data'] != null) { //遍历data并转换为我们传进来的类型 (json['data'] as List).forEach((v) { mData.add(EntityFactory.generateOBJ (v)); }); } return BaseListEntity( code: json["code"], message: json["msg"], data: mData, ); } }
ErrorEntity:
class ErrorEntity { int code; String message; ErrorEntity({this.code, this.message}); }
NWApi:
class NWApi { static final baseApi = "https://easy-mock.bookset.io/mock/5dfae67d4946c20a50841fa7/example/"; static final loginPath = "user/login";//接口返回:{"code": int, "message": "String", "data": {"account": "String", "password": "String"}} static final queryListPath = "/query/list";//接口返回:{"code": ing, "message": "String", "data": [int, int, String, int, String, int]} static final queryListJsonPath = "/query/listjson";//接口返回:{"code": int, "message": "String", "data": [{"account": "String", "password": "String"}, {"account": "String", "password": "String"}]} }
NWMethod:
enum NWMethod { GET, POST, DELETE, PUT } //使用:NWMethodValues[NWMethod.POST] const NWMethodValues = { NWMethod.GET: "get", NWMethod.POST: "post", NWMethod.DELETE: "delete", NWMethod.PUT: "put" };
下面就可以进行正式的封装了:
第一步是创建Dio的单例辅助类,并初始化Dio和对Dio进行一些全局的参数设置:
import 'package:dio/dio.dart'; import 'package:flutter_app/network/NWApi.dart'; import 'package:flutter_app/utils/PrintUtil.dart'; class DioManager { static final DioManager _shared = DioManager._internal(); factory DioManager() => _shared; Dio dio; DioManager._internal() { if (dio == null) { BaseOptions options = BaseOptions( baseUrl: NWApi.baseApi, contentType: Headers.jsonContentType, responseType: ResponseType.json, receiveDataWhenStatusError: false, connectTimeout: 30000, receiveTimeout: 3000, ); dio = Dio(options); } } }
第二步对请求进行封装,在我的想法中 {“code”: 0, “message”: “”, “data”: {}} 和 {“code”: 0, “message”: “”, “data”: []} 这两种数据是要分开两个请求方法的:
// 请求,返回参数为 T // method:请求方法,NWMethod.POST等 // path:请求地址 // params:请求参数 // success:请求成功回调 // error:请求失败回调 Future request(NWMethod method, String path, {Map params, Function(T) success, Function(ErrorEntity) error}) async { try { Response response = await dio.request(path, queryParameters: params, options: Options(method: NWMethodValues[method])); if (response != null) { BaseEntity entity = BaseEntity .fromJson(response.data); if (entity.code == 0) { success(entity.data); } else { error(ErrorEntity(code: entity.code, message: entity.message)); } } else { error(ErrorEntity(code: -1, message: "未知错误")); } } on DioError catch(e) { error(createErrorEntity(e)); } } // 请求,返回参数为 List // method:请求方法,NWMethod.POST等 // path:请求地址 // params:请求参数 // success:请求成功回调 // error:请求失败回调 Future requestList (NWMethod method, String path, {Map params, Function(List) success, Function(ErrorEntity) error}) async { try { Response response = await dio.request(path, queryParameters: params, options: Options(method: NWMethodValues[method])); if (response != null) { BaseListEntity entity = BaseListEntity .fromJson(response.data); if (entity.code == 0) { success(entity.data); } else { error(ErrorEntity(code: entity.code, message: entity.message)); } } else { error(ErrorEntity(code: -1, message: "未知错误")); } } on DioError catch(e) { error(createErrorEntity(e)); } }
提取请求错误处理方法createErrorEntity:
// 错误信息 ErrorEntity createErrorEntity(DioError error) { switch (error.type) { case DioErrorType.CANCEL:{ return ErrorEntity(code: -1, message: "请求取消"); } break; case DioErrorType.CONNECT_TIMEOUT:{ return ErrorEntity(code: -1, message: "连接超时"); } break; case DioErrorType.SEND_TIMEOUT:{ return ErrorEntity(code: -1, message: "请求超时"); } break; case DioErrorType.RECEIVE_TIMEOUT:{ return ErrorEntity(code: -1, message: "响应超时"); } break; case DioErrorType.RESPONSE:{ try { int errCode = error.response.statusCode; String errMsg = error.response.statusMessage; return ErrorEntity(code: errCode, message: errMsg); // switch (errCode) { // case 400: { // return ErrorEntity(code: errCode, message: "请求语法错误"); // } // break; // case 403: { // return ErrorEntity(code: errCode, message: "服务器拒绝执行"); // } // break; // case 404: { // return ErrorEntity(code: errCode, message: "无法连接服务器"); // } // break; // case 405: { // return ErrorEntity(code: errCode, message: "请求方法被禁止"); // } // break; // case 500: { // return ErrorEntity(code: errCode, message: "服务器内部错误"); // } // break; // case 502: { // return ErrorEntity(code: errCode, message: "无效的请求"); // } // break; // case 503: { // return ErrorEntity(code: errCode, message: "服务器挂了"); // } // break; // case 505: { // return ErrorEntity(code: errCode, message: "不支持HTTP协议请求"); // } // break; // default: { // return ErrorEntity(code: errCode, message: "未知错误"); // } // } } on Exception catch(_) { return ErrorEntity(code: -1, message: "未知错误"); } } break; default: { return ErrorEntity(code: -1, message: error.message); } } }
完整的 DioManager 类代码:
import 'package:dio/dio.dart'; import 'package:flutter_app/network/entity/BaseEntity.dart'; import 'package:flutter_app/network/entity/BaseListEntity.dart'; import 'package:flutter_app/network/entity/EntityFactory.dart'; import 'package:flutter_app/network/entity/ErrorEntity.dart'; import 'package:flutter_app/network/NWApi.dart'; import 'package:flutter_app/network/NWMethod.dart'; class DioManager { static final DioManager _shared = DioManager._internal(); factory DioManager() => _shared; Dio dio; DioManager._internal() { if (dio == null) { BaseOptions options = BaseOptions( baseUrl: NWApi.baseApi, contentType: Headers.jsonContentType, responseType: ResponseType.json, receiveDataWhenStatusError: false, connectTimeout: 30000, receiveTimeout: 3000, ); dio = Dio(options); } } // 请求,返回参数为 T // method:请求方法,NWMethod.POST等 // path:请求地址 // params:请求参数 // success:请求成功回调 // error:请求失败回调 Future request(NWMethod method, String path, {Map params, Function(T) success, Function(ErrorEntity) error}) async { try { Response response = await dio.request(path, queryParameters: params, options: Options(method: NWMethodValues[method])); if (response != null) { BaseEntity entity = BaseEntity .fromJson(response.data); if (entity.code == 0) { success(entity.data); } else { error(ErrorEntity(code: entity.code, message: entity.message)); } } else { error(ErrorEntity(code: -1, message: "未知错误")); } } on DioError catch(e) { error(createErrorEntity(e)); } } // 请求,返回参数为 List // method:请求方法,NWMethod.POST等 // path:请求地址 // params:请求参数 // success:请求成功回调 // error:请求失败回调 Future requestList (NWMethod method, String path, {Map params, Function(List ) success, Function(ErrorEntity) error}) async { try { Response response = await dio.request(path, queryParameters: params, options: Options(method: NWMethodValues[method])); if (response != null) { BaseListEntity entity = BaseListEntity .fromJson(response.data); if (entity.code == 0) { success(entity.data); } else { error(ErrorEntity(code: entity.code, message: entity.message)); } } else { error(ErrorEntity(code: -1, message: "未知错误")); } } on DioError catch(e) { error(createErrorEntity(e)); } } // 错误信息 ErrorEntity createErrorEntity(DioError error) { switch (error.type) { case DioErrorType.CANCEL:{ return ErrorEntity(code: -1, message: "请求取消"); } break; case DioErrorType.CONNECT_TIMEOUT:{ return ErrorEntity(code: -1, message: "连接超时"); } break; case DioErrorType.SEND_TIMEOUT:{ return ErrorEntity(code: -1, message: "请求超时"); } break; case DioErrorType.RECEIVE_TIMEOUT:{ return ErrorEntity(code: -1, message: "响应超时"); } break; case DioErrorType.RESPONSE:{ try { int errCode = error.response.statusCode; String errMsg = error.response.statusMessage; return ErrorEntity(code: "$errCode", message: errMsg); // switch (errCode) { // case 400: { // return ErrorEntity(code: errCode, message: "请求语法错误"); // } // break; // case 403: { // return ErrorEntity(code: errCode, message: "服务器拒绝执行"); // } // break; // case 404: { // return ErrorEntity(code: errCode, message: "无法连接服务器"); // } // break; // case 405: { // return ErrorEntity(code: errCode, message: "请求方法被禁止"); // } // break; // case 500: { // return ErrorEntity(code: errCode, message: "服务器内部错误"); // } // break; // case 502: { // return ErrorEntity(code: errCode, message: "无效的请求"); // } // break; // case 503: { // return ErrorEntity(code: errCode, message: "服务器挂了"); // } // break; // case 505: { // return ErrorEntity(code: errCode, message: "不支持HTTP协议请求"); // } // break; // default: { // return ErrorEntity(code: errCode, message: "未知错误"); // } // } } on Exception catch(_) { return ErrorEntity(code: -1, message: "未知错误"); } } break; default: { return ErrorEntity(code: -1, message: error.message); } } } }
使用:
// 返回 LoginEntity DioManager().request( NWMethod.POST, NWApi.loginPath, params: {"account": "421789838@qq.com", "password": "123456"}, success: (data) { print("success data = $data"}); }, error: (error) { print("error code = ${error.code}, massage = ${error.message}"); } ); // 返回 List DioManager().requestList ( NWMethod.POST, NWApi.queryListJsonPath, params: {"account": "421789838@qq.com", "password": "123456"}, success: (data) { print("success data = $data"}); }, error: (error) { print("error code = ${error.code}, massage = ${error.message}"); } );
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