Flutter封装Dio实现网络请求

引入依赖

Dio地址：https://pub.dev/packages/dio

dependencies:
  dio: ^4.0.6

进行封装

封装一个全局的Dio

import 'package:dio/dio.dart';

class HttpGlobal{
  static  Dio? _dio;
  static Dio httpClient(){
    if(_dio == null){
      _dio = new Dio();
      _dio?.options = new BaseOptions(
        //配置接口地址
        baseUrl: "https://www.jianshu.com",
        //配置连接超时时间
        connectTimeout: 5000,
        //配置发送超时时间
        sendTimeout: 5000,
        //配置接收超时时间
        receiveTimeout: 5000,
        //配置请求头
        headers: {

        },
        //配置contentType
        contentType: Headers.jsonContentType,
        //配置responseType
        responseType: ResponseType.json,

      );
      //请求的拦截
      _dio?.interceptors.add(new InterceptorsWrapper(
          onRequest:(options,handler){
            print("请求" + options.extra.toString());
            handler.next(options);
          },
          onError: (e,handler){
            print("请求出错");
            handler.next(e);
          },
          onResponse: (response,handler){
            print("请求返回");
            handler.next(response);
          }
      ));
    }
    return _dio!;
  }
}

使用

void test()async{
    var result = await HttpGlobal.httpClient().get("/");
    print(result);
  }

更多的请求方式可以在官方页面查看：https://pub.dev/packages/dio