1、新建项目

2、编写Server端

1、创建一个文件夹，然后新建main.dart

2、按下F5后会出现

修改里面的内容

3、使用Dart编写一个服务处理

import 'dart:convert';
import 'dart:io';
import 'data.dart';
main() async{
  var requestServer = await HttpServer.bind("192.168.51.211", 8080);
  print("http服务启动起来了");
  //处理请求
  await for(HttpRequest request in requestServer){
    // request.response..write('request success...')..close();//..是语法糖，表示可以一直请求，不用再写
    handleMessage(request);
  }
}
void handleMessage(HttpRequest request){
  try{
    if(request.method == "GET"){
      handleGET(request);
    }else if(request.method == "POST"){
      //TODO
      handleGET(request);
    }
  }catch(e){
    print("捕获了一个异常：$e");
  }
}
void handleGET(HttpRequest request){
  //获取请求参数
  var action = request.uri.queryParameters['action'];
  if(action == 'getProducts'){
    print("获取产品数据...");
    request.response..statusCode = HttpStatus.ok
    ..write(json.encode(products))..close();
  }
  if(action == 'getNews'){
    print("获取新闻数据...");
    request.response..statusCode = HttpStatus.ok
    ..write(json.encode(news))..close();
  }
}
void handlePOST(HttpRequest request){
  //处理POST请求
}

4、编写data.dart

//产品数据
var products = {
  "items":[
    {
      "desc": "屏幕尺寸： 13.3英寸 处理器： Intel Core i5-8259",
      "imageUrl":"assets/images/products/1.jpeg",
      "type":"新款",
      "name":"苹果笔记本",
    },
    {
      "desc": "处理器：Intel Core i7-5960X 内存大小：32GB 显卡芯片：双NVIDIA GeForce GTX ",
      "imageUrl":"assets/images/products/2.jpeg",
      "type": "新款",
      "point":"强悍",
      "name":"外星人笔记本",
    },
    {
      "desc": "Intel,至强处理器E5系列 英特尔C610系列芯片组 机械硬盘:SAS,SATA,近线SAS;固态硬盘:SAS,SATA",
      "imageUrl":"assets/images/products/3.jpeg",
      "type": "经典",
      "point":"稳定性好噪音小",
      "name":"戴尔 PowerEdge R730",
    },
    {
      "desc": "屏幕尺寸： 13.3英寸 处理器： Intel Core i5-8259",
      "imageUrl":"assets/images/products/1.jpeg",
      "type": "新款",
      "point":"超轻超薄",
      "name":"苹果笔记本",
    },
    {
      "desc": "屏幕尺寸： 13.3英寸 处理器： Intel Core i5-8259",
      "imageUrl":"assets/images/products/1.jpeg",
      "type": "新款",
      "point":"超轻超薄",
      "name":"苹果笔记本",
    },
    {
      "desc": "处理器：Intel Core i7-5960X 内存大小：32GB 显卡芯片：双NVIDIA GeForce GTX ",
      "imageUrl":"assets/images/products/2.jpeg",
      "type": "新款",
      "point":"强悍",
      "name":"外星人笔记本",
    },
    {
      "desc": "Intel,至强处理器E5系列 英特尔C610系列芯片组 机械硬盘:SAS,SATA,近线SAS;固态硬盘:SAS,SATA",
      "imageUrl":"assets/images/products/3.jpeg",
      "type": "经典",
      "point":"稳定性好噪音小",
      "name":"戴尔 PowerEdge R730",
    },
    {
      "desc": "屏幕尺寸： 13.3英寸 处理器： Intel Core i5-8259",
      "imageUrl":"assets/images/products/1.jpeg",
      "type": "新款",
      "point":"超轻超薄",
      "name":"苹果笔记本",
    },
  ]
};
var news = {
  "items":[
    {
      "author":"张小平",
      "title":"添加商品",
      "content":"小张添加了一个关于服务器的商品"
    },
    {
      "author": "陈软发",
      "title":"好消息",
      "content": "公司服务器全年成功销售1万台",
    },
    {
      "author": "李东升",
      "title":"收集商品信息",
      "content": "销售人员开始找每个商家收集商品信息，包括商品名称，价格，活动等",
    },
  ]
};

测试请求

import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
void main() {
  runApp(MyApp());
}
class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}
class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);
  final String title;
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: RaisedButton(
          child: Text("按钮"),
          onPressed: () async {
            String url = "http://192.168.51.211:8080/?action=getProducts";
            var res = await http.get(url);
            var body = res.body;
            print("body = $body");
            var json = jsonDecode(body);
          },
        ),
      ),
    );
  }
}