目录:
- @R_404_410@Manager:@R_404_410@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<T>:数据基类,返回的参数为 {“code”: 0,“message”: “”,“data”: {}}
- BaseListEntity<T>:数据基类2,返回的参数为 {“code”: 0,“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.data}); factory BaseListEntity.fromJson(json) { List<T> 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<T>(v)); }); } return BaseListEntity( code: json["code"],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,"data": [int,int,String,int]} static final queryListJsonPath = "/query/listjson";//接口返回:{"code": int,"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@R_404_410@的单例辅助类,并初始化@R_404_410@和对@R_404_410@进行一些全局的参数设置:
import 'package:@R_404_410@/@R_404_410@.dart'; import 'package:flutter_app/network/NWApi.dart'; import 'package:flutter_app/utils/PrintUtil.dart'; class @R_404_410@Manager { static final @R_404_410@Manager _shared = @R_404_410@Manager._internal(); factory @R_404_410@Manager() => _shared; @R_404_410@ @R_404_410@; @R_404_410@Manager._internal() { if (@R_404_410@ == null) { BaSEOptions options = BaSEOptions( baseUrl: NWApi.baseApi,contentType: Headers.jsonContentType,responseType: ResponseType.json,receiveDataWhenStatusError: false,connectTimeout: 30000,receiveTimeout: 3000,); @R_404_410@ = @R_404_410@(options); } } }
第二步对请求进行封装,在我的想法中 {“code”: 0,“data”: {}} 和 {“code”: 0,“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 params,Function(T) success,Function(ErrorEntity) error}) async { try { Response response = await @R_404_410@.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 @R_404_410@Error 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<T>(NWMethod method,Function(List) success,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 @R_404_410@Error catch(e) { error(createErrorEntity(e)); } }
// 错误信息 ErrorEntity createErrorEntity(@R_404_410@Error error) { switch (error.type) { case @R_404_410@ErrorType.CANCEL:{ return ErrorEntity(code: -1,message: "请求取消"); } break; case @R_404_410@ErrorType.CONNECT_TIMEOUT:{ return ErrorEntity(code: -1,message: "连接超时"); } break; case @R_404_410@ErrorType.SEND_TIMEOUT:{ return ErrorEntity(code: -1,message: "请求超时"); } break; case @R_404_410@ErrorType.RECEIVE_TIMEOUT:{ return ErrorEntity(code: -1,message: "响应超时"); } break; case @R_404_410@ErrorType.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:@R_404_410@/@R_404_410@.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 @R_404_410@Manager { static final @R_404_410@Manager _shared = @R_404_410@Manager._internal(); factory @R_404_410@Manager() => _shared; @R_404_410@ @R_404_410@; @R_404_410@Manager._internal() { if (@R_404_410@ == null) { BaSEOptions options = BaSEOptions( baseUrl: NWApi.baseApi,); @R_404_410@ = @R_404_410@(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,Function(List<T>) success,message: "未知错误")); } } on @R_404_410@Error catch(e) { error(createErrorEntity(e)); } } // 错误信息 ErrorEntity createErrorEntity(@R_404_410@Error error) { switch (error.type) { case @R_404_410@ErrorType.CANCEL:{ return ErrorEntity(code: -1,message: "响应超时"); } break; case @R_404_410@ErrorType.RESPONSE:{ try { int errCode = error.response.statusCode; String errMsg = error.response.statusMessage; return ErrorEntity(code: "$errCode",message: error.message); } } } }
使用:
// 返回 LoginEntity @R_404_410@Manager().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 @R_404_410@Manager().requestList<LoginEntity>( NWMethod.POST,NWApi.queryListJsonPath,massage = ${error.message}"); } );