dependencies:

  dio: 2.1.x  #latest version

import 'package:dio/dio.dart'; //导入前需要配置

 String data;

  void _getDio() async {

    Response response =

        await Dio().get("https://jsonplaceholder.typicode.com/posts/1");

    print("get ====== "+response.toString());

    final body = json.decode(response.toString());

    setState(() {

      data = body['title'];

      print("title ====== "+data);

    });

  }

void _postDio() async {

    var headers = Map<String, String>();

    headers['loginSource'] = 'IOS';

    headers['useVersion'] = '3.1.0';

    headers['isEncoded'] = '1';

    headers['bundleId'] = 'com.nongfadai.iospro';

    headers['Content-Type'] = 'application/json';

    Dio dio = Dio();

    dio.options.baseUrl = "http://api.juheapi.com/japi/toh";

    dio.options.connectTimeout = 60000;

    dio.options.receiveTimeout = 60000;

    dio.options.headers.addAll(headers);

    dio.options.method = 'post';

    var params = {

      'v': '1.0',

      'month': '7',

      'day': '25',

      'key': 'bd6e35a2691ae5bb8425c8631e475c2a'

    };

    Options option = Options(method: 'post');

    Response response = await dio.post("http://api.juheapi.com/japi/toh",

        /*data: {

          "v": "1.0",

          "month": "7",

          "day": "25",

          "key": "bd6e35a2691ae5bb8425c8631e475c2a"

        },*/

        data: params,

        options: option);

    if (response.statusCode == 200) {

      debugPrint('===请求求url: ${response.request.uri.toString()}');

      debugPrint('===请求headler: ${response.request.headers}');

      debugPrint('===请求结果: \n${response.data}\n');

    } else {

      print('请求失败');

    }

  }

import 'dart:convert';

import 'package:flutter/material.dart';

import 'package:dio/dio.dart';

class HttpDemo1 extends StatefulWidget {

  @override

  State<StatefulWidget> createState() {

    // TODO: implement createState

    return new HttpPage();

  }

}

class HttpPage extends State<HttpDemo1> {

  @override

  void initState() {

    // TODO: implement initState

    super.initState();

    _getDio();

    _postDio();

  }

  @override

  Widget build(BuildContext context) {

    // TODO: implement build

    return new Scaffold(

      appBar: new AppBar(

        title: new Text("Dio网络请求"),

      ),

      body: new Center(

        child: new Text("$data"),

      ),

    );

  }

}