Flutter Dio二次封装
2024-05-28 20:10:42
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<T>(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<T> {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<T>(json["data"]),);}
}
BaseListEntity：
class BaseListEntity<T> {int code;String message;List<T> data;BaseListEntity({this.code, this.message, this.data});factory BaseListEntity.fromJson(json) {List<T> mData = new List<T>();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<T>(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<T>(NWMethod method, String path, {Map<String, dynamic> 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<T>.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<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 requestList<T>(NWMethod method, String path, {Map<String, dynamic> params, Function(List<T>) 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<T>.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<T>(NWMethod method, String path, {Map<String, dynamic> 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<T>.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<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 requestList<T>(NWMethod method, String path, {Map<String, dynamic> params, Function(List<T>) 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<T>.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<LoginEntity>(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<LoginEntity>
DioManager().requestList<LoginEntity>(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}");}
);
作者：头发还没秃
链接：https://segmentfault.com/a/1190000021537855
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