网络请求

import 'package:flutter/material.dart';
import 'package:dio/dio.dart';

class HomePage extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return HomePageState();
  }
}

class HomePageState extends State<HomePage> {
  String result = '';
  TextEditingController controller = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text("简单网络请求")),
      body: Container(
        child: Column(
          children: <Widget>[
            TextField(
              controller: controller,
              decoration: InputDecoration(
                  contentPadding: EdgeInsets.all(10.0),
                  labelText: "名称",
                  helperText: "请输入要查询的名称"),
              autofocus: false,
            ),
            RaisedButton(
              onPressed: () {
                var params = controller.text.trim().toString();
                Future future = getUser(params);
                future.then((value) {
                  print('value---------$value');
                  setState(() {
//                    result = value['data']['name'].toString();
                    result = value.toString();
                  });
                });
              },
              child: Text('查询'),
            ),
            Text(result)
          ],
        ),
      ),
    );
  }

  Future getUser(String name) async {
    if (name == '') {
      showDialog(
          context: context,
          builder: (context) => AlertDialog(
                title: Text('提示'),
                content: Text('关键字为空'),
              ));
      return '关键字为空';
    } else {
      try {
        print('params---------$name');
        var param = {'userName': name};
        var response = await Dio().get(
            "http://localhost:11220/api/userInfo/getUserListAll",
            queryParameters: param);
        return response.data;
      } catch (e) {
        return e.toString();
      }
    }
  }
}