logistics-client-flutter/lib/util/request.dart

import 'package:dio/dio.dart';

import 'config.dart'; //用于配置公用常量

class Http {
  static Http instance;
  static String token;
  static Config _config = Config();
  static Dio _dio;
  BaseOptions _options;

  static Http getInstance() {
    print("getInstance");
    if (instance == null) {
      instance = new Http();
    }
  }

  Http() {
    // 初始化 Options
    _options = BaseOptions(
      baseUrl: _config.baseUrl,
      connectTimeout: _config.connectTimeout,
      receiveTimeout: _config.receiveTimeout,
      headers: {}
    );

    _dio = new Dio(_options);

    // //发送请求拦截处理，例如：添加token使用
    //   _dio.interceptor.request.onSend = (Options options) async{

    //     print(options.baseUrl);
    //     return options;
    //   };

    // //请求成功拦截，简化代码中调用难度
    //   _dio.interceptor.response.onSuccess = (Response response) async{
    //     print(response.statusCode);
    //     return response;
    //   };
    // 	//请求失败拦截
    //   _dio.interceptor.response.onError = (DioError e) {
    //     print(e);
    //     return e;
    //   };

  }

  // get 请求封装
  get(url, {
    options,
    cancelToken,
    data = null
  }) async {
    print('get:::url：$url ,body: $data');
    Response response;
    try {
        response = await _dio.get(
          url,
          queryParameters: data,
          cancelToken: cancelToken
        );
    }
    on DioError
    catch (e) {
      if (CancelToken.isCancel(e)) {
        print('get请求取消! ' + e.message);
      } else {
        print('get请求发生错误：$e');
      }
    }
    return response.data;
  }

  // post请求封装
  post(url, {
    options,
    cancelToken,
    data = null
  }) async {
    print('post请求::: url：$url ,body: $data');
    Response response;

    try {
      response = await _dio.post(
        url,
        data: data != null ? data : {},
        cancelToken: cancelToken
      );
      print(response);
    }
    on DioError
    catch (e) {
      if (CancelToken.isCancel(e)) {
        print('get请求取消! ' + e.message);
      } else {
        print('get请求发生错误：$e');
      }
    }
    return response.data;
  }
}