Flutter-Dio二次封装，不同层级的Android开发者的不同行为

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”]),
);
}
}

class baseListEntity {
int code;
String message;
List data;

baseListEntity({this.code, this.message, this.data});

factory baseListEntity.fromJson(json) {
List mData = new 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,
);
}
}

class ErrorEntity {
int code;
String message;
ErrorEntity({this.code, this.message});
}

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”}]}
}

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”
};

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, St

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ring 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);
}
}
}

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”);
}