目錄:
- DioManager:Dio輔助類
- NWMethod:請求方法,get、post等
- NWApi:大家都知道
- EntityFactory:json轉換輔助工廠,把json轉爲T
- BaseEntity< T >:數據基類,返回的參數爲 {“code”: 0, “message”: “”, “data”: {}}
- BaseListEntity< T >:數據基類2,返回的參數爲 {“code”: 0, “message”: “”, “data”: []}
- ErrorEntity:請求報錯基類,{“code”: 0, “message”: “”}
EntityFactory:
class EntityFactory {
static T generateOBJ<T>(json) {
if (json == null) {
return null;
}
//可以在這裏加入任何需要並且可以轉換的類型,例如下面
// else if (T.toString() == "LoginEntity") {
// return LoginEntity.fromJson(json) as T;
// }
else {
return json as T;
}
}
}
BaseEntity< T >:
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值需要經過工廠轉換爲我們傳進來的類型
data: EntityFactory.generateOBJ<T>(json["data"]),
);
}
}
BaseListEntity< T >:
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) {
//遍歷data並轉換爲我們傳進來的類型
(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"
};
下面就可以進行正式的封裝了:
- 第一步是創建Dio的單例輔助類,並初始化Dio和對Dio進行一些全局的參數設置:
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);
}
}
}
- 第二步對請求進行封裝,在我的想法中 {“code”: 0, “message”: “”, “data”: {}} 和 {“code”: 0, “message”: “”, “data”: []} 這兩種數據是要分開兩個請求方法的:
// 請求,返回參數爲 T
// method:請求方法,NWMethod.POST等
// path:請求地址
// params:請求參數
// success:請求成功回調
// error:請求失敗回調
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: "未知錯誤"));
}
} on DioError catch(e) {
error(createErrorEntity(e));
}
}
// 請求,返回參數爲 List<T>
// method:請求方法,NWMethod.POST等
// path:請求地址
// params:請求參數
// success:請求成功回調
// error:請求失敗回調
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: "未知錯誤"));
}
} on DioError catch(e) {
error(createErrorEntity(e));
}
}
提取請求錯誤處理方法createErrorEntity: // 錯誤信息
ErrorEntity createErrorEntity(DioError error) {
switch (error.type) {
case DioErrorType.CANCEL:{
return ErrorEntity(code: -1, message: "請求取消");
}
break;
case DioErrorType.CONNECT_TIMEOUT:{
return ErrorEntity(code: -1, message: "連接超時");
}
break;
case DioErrorType.SEND_TIMEOUT:{
return ErrorEntity(code: -1, message: "請求超時");
}
break;
case DioErrorType.RECEIVE_TIMEOUT:{
return ErrorEntity(code: -1, message: "響應超時");
}
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: "請求語法錯誤");
// }
// break;
// case 403: {
// return ErrorEntity(code: errCode, message: "服務器拒絕執行");
// }
// break;
// case 404: {
// return ErrorEntity(code: errCode, message: "無法連接服務器");
// }
// break;
// case 405: {
// return ErrorEntity(code: errCode, message: "請求方法被禁止");
// }
// break;
// case 500: {
// return ErrorEntity(code: errCode, message: "服務器內部錯誤");
// }
// break;
// case 502: {
// return ErrorEntity(code: errCode, message: "無效的請求");
// }
// break;
// case 503: {
// return ErrorEntity(code: errCode, message: "服務器掛了");
// }
// break;
// case 505: {
// return ErrorEntity(code: errCode, message: "不支持HTTP協議請求");
// }
// break;
// default: {
// return ErrorEntity(code: errCode, message: "未知錯誤");
// }
// }
} on Exception catch(_) {
return ErrorEntity(code: -1, message: "未知錯誤");
}
}
break;
default: {
return ErrorEntity(code: -1, message: error.message);
}
}
}
完整的 DioManager 類代碼: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);
}
}
// 請求,返回參數爲 T
// method:請求方法,NWMethod.POST等
// path:請求地址
// params:請求參數
// success:請求成功回調
// error:請求失敗回調
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: "未知錯誤"));
}
} on DioError catch(e) {
error(createErrorEntity(e));
}
}
// 請求,返回參數爲 List<T>
// method:請求方法,NWMethod.POST等
// path:請求地址
// params:請求參數
// success:請求成功回調
// error:請求失敗回調
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: "未知錯誤"));
}
} on DioError catch(e) {
error(createErrorEntity(e));
}
}
// 錯誤信息
ErrorEntity createErrorEntity(DioError error) {
switch (error.type) {
case DioErrorType.CANCEL:{
return ErrorEntity(code: -1, message: "請求取消");
}
break;
case DioErrorType.CONNECT_TIMEOUT:{
return ErrorEntity(code: -1, message: "連接超時");
}
break;
case DioErrorType.SEND_TIMEOUT:{
return ErrorEntity(code: -1, message: "請求超時");
}
break;
case DioErrorType.RECEIVE_TIMEOUT:{
return ErrorEntity(code: -1, message: "響應超時");
}
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: "請求語法錯誤");
// }
// break;
// case 403: {
// return ErrorEntity(code: errCode, message: "服務器拒絕執行");
// }
// break;
// case 404: {
// return ErrorEntity(code: errCode, message: "無法連接服務器");
// }
// break;
// case 405: {
// return ErrorEntity(code: errCode, message: "請求方法被禁止");
// }
// break;
// case 500: {
// return ErrorEntity(code: errCode, message: "服務器內部錯誤");
// }
// break;
// case 502: {
// return ErrorEntity(code: errCode, message: "無效的請求");
// }
// break;
// case 503: {
// return ErrorEntity(code: errCode, message: "服務器掛了");
// }
// break;
// case 505: {
// return ErrorEntity(code: errCode, message: "不支持HTTP協議請求");
// }
// break;
// default: {
// return ErrorEntity(code: errCode, message: "未知錯誤");
// }
// }
} on Exception catch(_) {
return ErrorEntity(code: -1, message: "未知錯誤");
}
}
break;
default: {
return ErrorEntity(code: -1, message: error.message);
}
}
}
}
使用:
// 返回 LoginEntity
DioManager().request<LoginEntity>(
NWMethod.POST,
NWApi.loginPath,
params: {"account": "[email protected]", "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": "[email protected]", "password": "123456"},
success: (data) {
print("success data = $data"});
}, error: (error) {
print("error code = ${error.code}, massage = ${error.message}");
}
);