mobileCyberGamesApp/lib/styles/netUtil.dart

import 'package:dio/dio.dart';
import 'api.dart';
import 'package:shared_preferences/shared_preferences.dart';

class NetUtil {
  static const String GET = "get";
  static const String POST = "post";

  //get请求
  static void get(String url, Function callBack,
      {Map<String, dynamic> params, Function errorCallBack}) async {
    if (!url.startsWith("http")) {
      url = domain + url;
    }

    _request(url, callBack,
        method: GET, params: params, errorCallBack: errorCallBack);
  }

  //post请求
  static void post(String url, Function callBack,
      {Map<String, dynamic> params, Function errorCallBack}) async {
    print('**************');
    if (!url.startsWith("http")) {
      url = domain + url;
    }
    _request(url, callBack,
        method: POST, params: params, errorCallBack: errorCallBack);
  }

  //具体的还是要看返回数据的基本结构
  //公共代码部分
  static void _request(String url, Function callBack,
      {String method,
      Map<String, dynamic> params,
      Function errorCallBack}) async {
    print("<net> url :<" + method + ">" + url);

    if (params != null && params.isNotEmpty) {
      print("<net> params :" + params.toString());
    }

    String errorMsg = "";
    int statusCode;

    final prefs = await SharedPreferences.getInstance();
    String _electricContest = prefs.getString('token') != null
        ? prefs.getString('token')
        : '';
    try {
      Response response;
      if (method == GET) {
        //组合GET请求的参数
        if (params != null && params.isNotEmpty) {
          StringBuffer sb = new StringBuffer("?");
          params.forEach((key, value) {
            sb.write("$key" + "=" + "$value" + "&");
          });
          String paramStr = sb.toString();
          paramStr = paramStr.substring(0, paramStr.length - 1);
          url += paramStr;
        }
        response = await Dio()
            .get(url, options: Options(headers: {"token": _electricContest}));
      } else {
        if (params != null && params.isNotEmpty) {
          FormData _formData = FormData.from(params);
          response = await Dio().post(url,
              data: _formData,
              options: Options(headers: {"token": _electricContest}));
        } else {
          response = await Dio().post(url,
              options: Options(headers: {"token": _electricContest}));
        }
      }

      statusCode = response.statusCode;

      print(response);
      //打印结果

      //处理错误部分
      if (statusCode < 0) {
        errorMsg = "网络请求错误,状态码:" + statusCode.toString();
        _handError(errorCallBack, errorMsg);
        return;
      }

      if (callBack != null) {
        callBack(response.data);
        print("<net> response data:" + response.data);
      }
    } catch (exception) {
      _handError(errorCallBack, exception.toString());
    }
  }

  //处理异常
  static void _handError(Function errorCallback, String errorMsg) {
    if (errorCallback != null) {
      errorCallback(errorMsg);
    }
    print("<net> errorMsg :" + errorMsg);
  }
}