flutter dio使用和dio前端处理模板

dio网络请求：
本实例使用dio版本：dio: ^3.0.9
网络处理模板：

import 'package:dio/dio.dart';
class HttpUtils{
    
    
  static Dio dio;
  static const String API_PREFIX = "自己的apl接口";
  static const int CONNECT_TIMEOUT =  50000;
  static const int RECRIVE_TIMEOUT = 20000;
  static const String GET = 'get';
  static const String POST = 'post';
  static const String PUT = 'put';
  static const String PATCH = 'patch';
  static const String DELETE = 'delete';
  static Future<String> request(
      String url,{
    
    data,method})
  async{
    
    
    data = data??{
    
    };
    method = method ?? "GET";

    data.forEach((key,value){
    
    
      if(url.indexOf(key) != -1){
    
    
        url = url.replaceAll(':$key',value.toString());
      }
    });
    print("请求地址："+method+'  '+url);
    print("请求参数："+data.toString());
    Dio dio = createInstance();
    var result;
    try{
    
    
      print("url:"+url);
      Response response = await dio.request(url,queryParameters: data,options: new Options(method: method));
      result =response.data;
      print("响应数据："+response.toString());
    }on DioError catch(e){
    
    
      print("请求错误"+e.toString());
    }
    return result.toString();
  }
static Dio createInstance(){
    
    
    if(dio == null){
    
    
      BaseOptions options = new BaseOptions(
        baseUrl: API_PREFIX,
        connectTimeout: CONNECT_TIMEOUT,
        receiveTimeout: RECRIVE_TIMEOUT,
      );
      dio = new Dio(options);
    }
    return dio;
}
static clear(){
    
    
    dio = null;
}
}

使用：

var result = await HttpUtils.request(
             "//如果为put或者delete在此添加",
             //method: HttpUtils.传值方式,
			例：method: HttpUtils.get,
                    data: {
    
    
				//发送给后台的参数
                                });
                            var result_json = JSON.jsonDecode(result);
                            setState(() {
    
    
                              id = result_json['id'].toString();
                            });
                            if (id == "0") {
    
    
                              await _iostishi();
                            } else {
    
    
                              await _iosshibai();
                            }