Flutter 一卡通 API 服务类和调用示例

以下是 ApiService 类中的网络请求代码：

import 'dart:convert';

import 'package:dio/dio.dart';

class ApiService {
  Dio dio = Dio();

  //获取一卡通近期流水
  Future<List<Map<String, String>>> getRecentlyTransactions(String jwc_xuehao) async {
    List<Map<String, String>> yikatong_recent = [];
    String starttime = await DateTime.now()
        .add(Duration(days: -30))
        .toString()
        .substring(0, 10)
        .replaceAll('-', '')
        .toString();
    String endtime = await DateTime.now()
        .toString()
        .substring(0, 10)
        .replaceAll('-', '')
        .toString();
    Response response = await dio.post(
        'http://wxy.hrbxyz.cn/api/Apixyk/gethistorytrjn?account=' +
            jwc_xuehao.toString() +
            '&schoolname=%E4%B8%9C%E5%8C%97%E7%9F%B3%E6%B2%B9%E5%A4%A7%E5%AD%A6&starttime=' +
            starttime.toString() +
            '&endtime=' +
            endtime.toString()
    );
    for (int i = 0; i < response.data['data']['obj'].length; i++) {
      yikatong_recent.add({
        'Effective_time': response.data['data']['obj'][i]['effectdate'],
        'Trading_time': response.data['data']['obj'][i]['JnDateTime'],
        'Transaction_amount': (response.data['data']['obj'][i]['TranAmt'] / 100).toString(),
        'TranName': response.data['data']['obj'][i]['TranName'],
      });
    }
    return yikatong_recent;
  }

  //获取一卡通的accno
  Future<String> getAccno(String jwc_xuehao) async {
    Response response = await dio.post(
        'http://wxy.hrbxyz.cn/api/Apixyk/getcardinfo?schoolname=东北石油大学&account=' +
            jwc_xuehao +
            '&password=112233');
    var data = json.decode(response.toString());
    return data['data']['obj']['AccNo'];
  }

  //获取一卡通的二维码
  Future<String> getQr(String jwc_xuehao) async {
    String accno = await getAccno(jwc_xuehao);
    Response response = await dio.post(
        'http://wxy.hrbxyz.cn/api/Apixyk/getval?schoolname=东北石油大学&account=' +
            jwc_xuehao +
            '&accno=' +
            accno +
            '&password=' +
            Global.password.substring(Global.password.length - 6, Global.password.length));
    var data = json.decode(response.toString());
    try {
      return data['data'];
    } catch (e) {
      return '一卡通系统错误';
    }
  }
}

下面是调用上述网络请求的代码：

class SomeClass {
  ApiService apiService = ApiService();

  void someMethod(BuildContext context) async {
    List<Map<String, String>> yikatong_recent = await apiService.getRecentlyTransactions(Global.jwc_xuehao);

    //创建流水表格
    Widget yikatong_recently = DataTable(
      columns: <DataColumn>[
        DataColumn(
          label: Container(
            //屏幕适配
            width: MediaQuery.of(context).size.width * 0.1,

            child: Text(
              '时间',
              style: TextStyle(fontStyle: FontStyle.italic),
            ),
          ),
        ),
        DataColumn(
          label: Container(
            width: MediaQuery.of(context).size.width * 0.1,
            child: Text(
              '类型',
              style: TextStyle(fontStyle: FontStyle.italic),
            ),
          ),
        ),
        DataColumn(
          label: Container(
            width: MediaQuery.of(context).size.width * 0.1,
            child: Text(
              '金额',
              style: TextStyle(fontStyle: FontStyle.italic),
            ),
          ),
        )
      ],
      rows: yikatong_recent
          .map(
            (recent) => DataRow(
          cells: <DataCell>[
            DataCell(Text(recent['Trading_time'])),
            DataCell(Text(recent['TranName'])),
            DataCell(Text(recent['Transaction_amount'])),
          ],
        ),
      )
          .toList(),
    );
    //弹出流水窗口
    showDialog(
        context: context,
        builder: (context) {
          return AlertDialog(
            title: const Text('一卡通近30天流水'),
            content: yikatong_recently,
            actions: <Widget>[
              TextButton(
                child: const Text('关闭'),
                onPressed: () {
                  Navigator.of(context).pop();
                },
              ),
            ],
          );
        });

    String qrcode = await apiService.getQr(Global.jwc_xuehao);
    print(qrcode);
  }
}