flutter dio 封装

import 'package:dio/dio.dart';
import 'dart:async';
import 'dart:io';

import 'package:share/system/Object_category.dart';

enum Method { get, post }
const baseURL = "xxxxxxx";你的域名地址
const getSwiperURL = baseURL + "Swiper/ls";
const getUserInfoURL = baseURL + "User/get_info";
const postTaskURL = baseURL + "Task/create_task";

Future sendRequest(String url, Method method, Map<String, dynamic> map) async {
  try {
    print("开始请求数据");
    Response response;
    Dio dio = new Dio();
    dio.options.contentType =
        ContentType.parse("application/x-www-form-urlencoded").toString();
    var type = method;
    switch (type) {
      case Method.get:
        print('开始使用get');
        response = await dio.get(url, queryParameters: map);
        break;
      case Method.post:
        print('开始使用post');
        FormData formData = FormData.fromMap(map);
        response = await dio.post(url, data: formData);
        break;
    }
    if (!empty(response.data)) {
      print('收到返回信息==>' + response.data);
    }
    if (response.statusCode == 200) {
      return response.data;
    } else {
      throw Exception('后端接口出现异常');
    }
  } catch (e) {
    return print('error');
  }
}

这个是用法

    return Scaffold(
        appBar: AppBar(
          backgroundColor: Colors.blue,
          title: Text("我的"),
        ),
        backgroundColor: Colors.white,
        body: FutureBuilder(
            future: sendRequest(getUserInfoURL, Method.post, {'uid': 100}), //第一个参数是api地址，第二个是post请求，第三个是数据
            builder: (context, snapshot) {
              if (snapshot.connectionState == ConnectionState.done) {
                if (snapshot.hasData) {
                  var obj = json.decode(snapshot.data.toString());
                  String username = obj['data']['nickname'];
                  String url = obj['data']['avatar'] == null
                      ? ''
                      : obj['data']['avatar'];
                  return ListView(
                    children: <Widget>[
                      _topHeader(username, url),
                      _actionList(),
                    ],
                  );
                } else {
                  return Container(
                      alignment: Alignment.center, child: Text('加载失败请重新加载'));
                }
              } else {
                return Container(
                    alignment: Alignment.center,
                    child: CircularProgressIndicator());
              }
            }));
  }
}

一般的使用方法

 sendRequest(postTaskURL, Method.post, map).then((value) {
        print(value);
        var obj = json.decode(value.toString());
        if (obj['code'] == 1) {
          print(obj['data']);
         //成功之后这边做相应的操作
        }
      }).catchError((error) {
        if (error) {
          print(error.toString());
        }
      });