flutter-template/lib/service/base_service.dart

import 'dart:io';

import 'package:dio/dio.dart';
import 'package:sprintf/sprintf.dart';

const String BASE_URL = "https://www.test.com/api";

/// 请求配置类
class HTTPConfig {
  static const baseURL = BASE_URL;
  static const connectTimeout = 5000;
  static const receiveTimeout = 10000;

  static int _channelType = 0;

  /// 获取平台信息
  static int getChannelType() {
    if (_channelType != 0) {
      return _channelType;
    }
    if (Platform.isAndroid) {
      _channelType = 1;
    } else {
      _channelType = 2;
    }
    return _channelType;
  }

  /// HTTP标准文件请求
  static Dio fileDio() {
    BaseOptions options =
        BaseOptions(baseUrl: baseURL, connectTimeout: connectTimeout);
    Dio dio = Dio(options);

    Interceptor dInter = InterceptorsWrapper(
        onRequest: (RequestOptions options, RequestInterceptorHandler handler) {
      print(sprintf("Dio request file to [%s].", [options.uri.toString()]));
      return handler.next(options);
    }, onResponse: (Response response, ResponseInterceptorHandler handler) {
      print(sprintf("Dio request file to [%s] replied with http status %d.",
          [response.requestOptions.uri.toString(), response.statusCode]));
      return handler.next(response);
    }, onError: (DioError error, ErrorInterceptorHandler handler) {
      print(sprintf("Dio request file to [%s] failed. %s",
          [error.requestOptions.uri.toString(), error.toString()]));
      return handler.next(error);
    });
    dio.interceptors.addAll([dInter]);
    return dio;
  }

  /// HTTP标准请求
  static Dio defaultDio() {
    BaseOptions options = BaseOptions(
        baseUrl: baseURL,
        connectTimeout: connectTimeout,
        receiveTimeout: receiveTimeout);
    Dio dio = Dio(options);

    Interceptor dInter = InterceptorsWrapper(
        onRequest: (RequestOptions options, RequestInterceptorHandler handler) {
      print(sprintf("Dio request to [%s].", [options.uri.toString()]));
      return handler.next(options);
    }, onResponse: (Response response, ResponseInterceptorHandler handler) {
      print(sprintf("Dio request to [%s] replied with http status %d. %s", [
        response.requestOptions.uri.toString(),
        response.statusCode,
        response.toString()
      ]));
      return handler.next(response);
    }, onError: (DioError error, ErrorInterceptorHandler handler) {
      print(sprintf("Dio request to [%s] failed. %s",
          [error.requestOptions.uri.toString(), error.toString()]));
      return handler.next(error);
    });
    dio.interceptors.addAll([dInter]);
    return dio;
  }
}

/// 数据请求基类
class BaseService {
  static final Dio dio = HTTPConfig.defaultDio();
  static final Dio fileDio = HTTPConfig.fileDio();

  /// HTTP请求数据
  Future<T?> request<T>(String url,
      {String method = 'get',
      dynamic data,
      Map<String, String>? headers}) async {
    final options = Options(method: method);

    try {
      if (null != headers && headers.length > 0) {
        if (null == options.headers) {
          options.headers = {};
        }
        headers.forEach((key, value) {
          options.headers![key] = value;
        });
      }
      Response response =
          await dio.request<T>(url, data: data, options: options);
      return response.data;
    } on DioError {
      return null;
    }
  }

  /// HTTP请求文件
  Future<Response?> requestFile(String url,
      {String method = 'get',
      dynamic data,
      ProgressCallback? onReceiveProgress,
      Map<String, String>? headers}) async {
    final options = Options(
      method: method,
      responseType: ResponseType.bytes,
      followRedirects: false,
    );

    try {
      if (null != headers && headers.length > 0) {
        if (null == options.headers) {
          options.headers = {};
        }
        headers.forEach((key, value) {
          options.headers![key] = value;
        });
      }
      Response response = await fileDio.request(url,
          data: data, onReceiveProgress: onReceiveProgress, options: options);
      return response;
    } on DioError {
      return null;
    }
  }
}