http

集成http库

https://pub.dartlang.org/packages/http添加依赖dependencies:  http: ^0.12.0安装flutter packages get导入import 'package:http/http.dart' as http;

常用方法

get(dynamic url, { Map
    
      headers }) → Future
     
    

• (必须)url:请求地址
• (可选)headers:请求头

post(dynamic url, { Map
    
      headers, dynamic body, Encoding encoding }) → Future
     
    

• (必须)url:请求地址
• (可选)headers:请求头
• (可选)body:参数
• (编码)Encoding:编码 例子

http.post('https://flutter-cn.firebaseio.com/products.json',            body: json.encode(param),encoding: Utf8Codec())    .then((http.Response response) {      final Map
    
      responseData = json.decode(response.body);     //处理响应数据         }).catchError((error) {      print('$error错误');    });
    

返回值都用到, 类似JavaScript中的promise 官方推荐使用async/await来调用网络请求

void addProduct(Product product) async {    Map
    
      param = {      'title': product.title,      'description': product.description,      'price': product.price    };    try {      final http.Response response = await http.post(          'https://flutter-cn.firebaseio.com/products.json',          body: json.encode(param),          encoding: Utf8Codec());      final Map
     
       responseData = json.decode(response.body);      print('$responseData 数据');          } catch (error) {      print('$error错误');    }  }
     
    

用 try catch来捕获错误 两种写法都可以,个人觉得第二种语法思路更明确.