Flutter實戰視頻-移動電商-22.JSON解析和複雜數據模型轉換技巧

時間 2019-11-07

標籤 flutter 實戰視頻移動 22.json json 解析複雜數據模型轉換技巧欄目無線简体版

原文原文鏈接

22.JSON解析和複雜數據模型轉換技巧

json轉Model類java

建立model文件夾，在裏面新建category.dart類git

主要根據這個json來分析咱們要作成類的樣子github

{
  "code": "0",
  "message": "success",
  "data": [
    {
      "mallCategoryId": "4",
      "mallCategoryName": "白酒",
      "bxMallSubDto": [
        {
          "mallSubId": "2c9f6c94621970a801626a35cb4d0175",
          "mallCategoryId": "4",
          "mallSubName": "名酒",
          "comments": ""
        },
        {
          "mallSubId": "2c9f6c94621970a801626a363e5a0176",
          "mallCategoryId": "4",
          "mallSubName": "寶丰",
          "comments": ""
        },
        {
          "mallSubId": "2c9f6c94621970a801626a3770620177",
          "mallCategoryId": "4",
          "mallSubName": "北京二鍋頭",
          "comments": ""
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cc035c15a8",
          "mallCategoryId": "4",
          "mallSubName": "大明",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cc2af915a9",
          "mallCategoryId": "4",
          "mallSubName": "杜康",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cc535115aa",
          "mallCategoryId": "4",
          "mallSubName": "頓丘",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cc77b215ab",
          "mallCategoryId": "4",
          "mallSubName": "汾酒",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cca72e15ac",
          "mallCategoryId": "4",
          "mallSubName": "楓林",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cccae215ad",
          "mallCategoryId": "4",
          "mallSubName": "高粱酒",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7ccf0d915ae",
          "mallCategoryId": "4",
          "mallSubName": "古井",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cd1d6715af",
          "mallCategoryId": "4",
          "mallSubName": "貴州大麴",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cd3f2815b0",
          "mallCategoryId": "4",
          "mallSubName": "國池",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cd5d3015b1",
          "mallCategoryId": "4",
          "mallSubName": "國窖",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cd7ced15b2",
          "mallCategoryId": "4",
          "mallSubName": "國臺",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cd9b9015b3",
          "mallCategoryId": "4",
          "mallSubName": "漢醬",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cdbfd215b4",
          "mallCategoryId": "4",
          "mallSubName": "紅星",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c946891d16801689474e2a70081",
          "mallCategoryId": "4",
          "mallSubName": "懷莊",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cdddf815b5",
          "mallCategoryId": "4",
          "mallSubName": "劍南春",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cdfd4815b6",
          "mallCategoryId": "4",
          "mallSubName": "江小白",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb1016802277c37160e",
          "mallCategoryId": "4",
          "mallSubName": "金沙",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7ce207015b7",
          "mallCategoryId": "4",
          "mallSubName": "京宮",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7ce46d415b8",
          "mallCategoryId": "4",
          "mallSubName": "酒鬼",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb101680226de23160d",
          "mallCategoryId": "4",
          "mallSubName": "口子窖",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7ce705515b9",
          "mallCategoryId": "4",
          "mallSubName": "郎酒",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7ce989e15ba",
          "mallCategoryId": "4",
          "mallSubName": "老口子",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cec30915bb",
          "mallCategoryId": "4",
          "mallSubName": "龍江家園",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cef15c15bc",
          "mallCategoryId": "4",
          "mallSubName": "瀘州",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cf156f15bd",
          "mallCategoryId": "4",
          "mallSubName": "鹿邑大麴",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cf425b15be",
          "mallCategoryId": "4",
          "mallSubName": "毛鋪",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cf9dc915c0",
          "mallCategoryId": "4",
          "mallSubName": "綿竹",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cfbf1c15c1",
          "mallCategoryId": "4",
          "mallSubName": "可貴糊塗",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cfdd7215c2",
          "mallCategoryId": "4",
          "mallSubName": "牛二爺",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7cf71e715bf",
          "mallCategoryId": "4",
          "mallSubName": "茅臺",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7d7eda715c3",
          "mallCategoryId": "4",
          "mallSubName": "綿竹",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7d96e5c15c4",
          "mallCategoryId": "4",
          "mallSubName": "可貴糊塗",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dab93b15c5",
          "mallCategoryId": "4",
          "mallSubName": "牛二爺",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dae16415c6",
          "mallCategoryId": "4",
          "mallSubName": "牛欄山",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7db11cb15c7",
          "mallCategoryId": "4",
          "mallSubName": "前門",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7db430c15c8",
          "mallCategoryId": "4",
          "mallSubName": "全興",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7db6cac15c9",
          "mallCategoryId": "4",
          "mallSubName": "捨得",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7db9a4415ca",
          "mallCategoryId": "4",
          "mallSubName": "雙溝",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dc30b815cb",
          "mallCategoryId": "4",
          "mallSubName": "水井坊",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dc543e15cc",
          "mallCategoryId": "4",
          "mallSubName": "四特",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dc765c15cd",
          "mallCategoryId": "4",
          "mallSubName": "潭酒",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dc988a15ce",
          "mallCategoryId": "4",
          "mallSubName": "沱牌",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dcba5a15cf",
          "mallCategoryId": "4",
          "mallSubName": "五糧液",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dcd9e815d0",
          "mallCategoryId": "4",
          "mallSubName": "西鳳",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dcf6d715d1",
          "mallCategoryId": "4",
          "mallSubName": "習酒",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dd11b215d2",
          "mallCategoryId": "4",
          "mallSubName": "小白楊",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dd2f3c15d3",
          "mallCategoryId": "4",
          "mallSubName": "洋河",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7dd969115d4",
          "mallCategoryId": "4",
          "mallSubName": "伊力特",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7ddb16c15d5",
          "mallCategoryId": "4",
          "mallSubName": "張弓",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7ddd6c715d6",
          "mallCategoryId": "4",
          "mallSubName": "中糧",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7de126815d7",
          "mallCategoryId": "4",
          "mallSubName": "竹葉青",
          "comments": null
        }
      ],
      "comments": null,
      "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170036_4477.png"
    },
    {
      "mallCategoryId": "1",
      "mallCategoryName": "啤酒",
      "bxMallSubDto": [
        {
          "mallSubId": "2c9f6c946016ea9b016016f79c8e0000",
          "mallCategoryId": "1",
          "mallSubName": "百威",
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          "mallSubId": "2c9f6c94608ff843016095163b8c0177",
          "mallCategoryId": "1",
          "mallSubName": "福佳",
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          "mallSubName": "哈爾濱",
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        {
          "mallSubId": "402880e86016d1b5016016dbff2f0002",
          "mallCategoryId": "1",
          "mallSubName": "漢德",
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          "mallSubName": "嶗山",
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    },
    {
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          "mallSubName": "澳大利亞",
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          "mallSubName": "南非",
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    },
    {
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    {
      "mallCategoryId": "2c9f6c946449ea7e01647cd108b60020",
      "mallCategoryName": "乳製品",
      "bxMallSubDto": [
        {
          "mallSubId": "2c9f6c946449ea7e01647dd4ac8c0048",
          "mallCategoryId": "2c9f6c946449ea7e01647cd108b60020",
          "mallSubName": "常溫純奶",
          "comments": ""
        },
        {
          "mallSubId": "2c9f6c946449ea7e01647dd4f6a40049",
          "mallCategoryId": "2c9f6c946449ea7e01647cd108b60020",
          "mallSubName": "常溫酸奶",
          "comments": ""
        },
        {
          "mallSubId": "2c9f6c946449ea7e01647dd51ab7004a",
          "mallCategoryId": "2c9f6c946449ea7e01647cd108b60020",
          "mallSubName": "低溫奶",
          "comments": ""
        }
      ],
      "comments": null,
      "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170151_9234.png"
    },
    {
      "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
      "mallCategoryName": "休閒零食",
      "bxMallSubDto": [
        {
          "mallSubId": "2c9f6c946449ea7e01647dc51d93003c",
          "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
          "mallSubName": "方便食品",
          "comments": ""
        },
        {
          "mallSubId": "2c9f6c946449ea7e01647dd204dc0040",
          "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
          "mallSubName": "麪包糕點",
          "comments": ""
        },
        {
          "mallSubId": "2c9f6c946449ea7e01647dd22f760041",
          "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
          "mallSubName": "糖果巧克力",
          "comments": ""
        },
        {
          "mallSubId": "2c9f6c946449ea7e01647dd254530042",
          "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
          "mallSubName": "膨化食品",
          "comments": ""
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7fa132b15e7",
          "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
          "mallSubName": "堅果炒貨",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7f4bfc415e2",
          "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
          "mallSubName": "肉乾豆乾",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7f5027a15e3",
          "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
          "mallSubName": "餅乾",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94679b4fb10167f7f530fd15e4",
          "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
          "mallSubName": "衝調",
          "comments": null
        },
        {
          "mallSubId": "2c9f6c94683a6b0d016846b49436003b",
          "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
          "mallSubName": "休閒水果",
          "comments": null
        }
      ],
      "comments": null,
      "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170200_7553.png"
    },
    {
      "mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
      "mallCategoryName": "糧油調味",
      "bxMallSubDto": [
        {
          "mallSubId": "2c9f6c946449ea7e01647dd2e8270043",
          "mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
          "mallSubName": "油/糧食",
          "comments": ""
        },
        {
          "mallSubId": "2c9f6c946449ea7e01647dd31bca0044",
          "mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
          "mallSubName": "調味品",
          "comments": ""
        },
        {
          "mallSubId": "2c9f6c946449ea7e01647dd35a980045",
          "mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
          "mallSubName": "醬菜罐頭",
          "comments": ""
        }
      ],
      "comments": null,
      "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20181212/20181212115842_9733.png"
    },
    {
      "mallCategoryId": "2c9f6c9468a85aef016925444ddb271b",
      "mallCategoryName": "積分商品",
      "bxMallSubDto": [
        
      ],
      "comments": null,
      "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190225/20190225232703_9950.png"
    }
  ]
}

json數據

class CategoryBigModel{
  String mallCategoryId;//類別編號
  String mallCategoryName;//類別名稱
}

comments這個字段都是null值。json

因此在建立了的時候咱們直接用null來表示async

咱們上面只作了一個模型類：CategoryBigModelide

在json裏面是有多個CategoryBigModel類的。就是一個list的數據。CategoryBigListModelui

使用咱們定義的model，和model的list集合

咱們要輸出大類的名稱this

輸出咱們的類別spa

快速生成咱們的dart類，數據模型

https://javiercbk.github.io/json_to_dart/3d

把全部的json複製過來，自動生成類

最終代碼

class CategoryBigModel{
  String mallCategoryId;//類別編號
  String mallCategoryName;//類別名稱
  List<dynamic> bxMallSubDto;//不知道具體模型就用dynamic類型
  Null comments;
  String image;

  //構造方法
  CategoryBigModel({
    this.mallCategoryId,
    this.mallCategoryName,
    this.bxMallSubDto,
    this.comments,
    this.image
  });
  //工廠類的構造方法,就是我經常使用的實例化對象模式，好處是咱們調用這個類的時候不用再使用new關鍵字了
  //至關於java裏面的多態，用起來和咱們的靜態方法是同樣的
  factory CategoryBigModel.formJson(dynamic json){
    return CategoryBigModel(
      mallCategoryId:json['mallCategoryId'],
      mallCategoryName:json['mallCategoryName'],
      bxMallSubDto:json['bxMallSubDto'],
      comments:json['comments'],
      image:json['image']
    );
  }
}

//列表的model
class CategoryBigListModel{
  List<CategoryBigModel> data;
  CategoryBigListModel(this.data);

  factory CategoryBigListModel.fromJson(List json){
    return CategoryBigListModel(
      json.map((i)=>CategoryBigModel.formJson((i))).toList()
    );
  }
}

category.dart

import 'package:flutter/material.dart';
import '../service/service_method.dart';
import 'dart:convert';
import '../model/category.dart';

class CategoryPage extends StatefulWidget {
  @override
  _CategoryPageState createState() => _CategoryPageState();
}

class _CategoryPageState extends State<CategoryPage> {
  @override
  Widget build(BuildContext context) {
    _getCategory();
    return Container(
      child:Center(
        child: Text('分類頁面'),
      )
    );
  }

  void _getCategory() async{
    await request('getCategory').then((val){
      var data=json.decode(val.toString());
      //print(data);
      CategoryBigListModel list= CategoryBigListModel.fromJson(data['data']);
      list.data.forEach((item)=>print(item.mallCategoryName));
    });
  }
}

category_page.dart

class CategoryBigModel{
  String mallCategoryId;//類別編號
  String mallCategoryName;//類別名稱
  List<dynamic> bxMallSubDto;//不知道具體模型就用dynamic類型
  Null comments;
  String image;

  //構造方法
  CategoryBigModel({
    this.mallCategoryId,
    this.mallCategoryName,
    this.bxMallSubDto,
    this.comments,
    this.image
  });
  //工廠類的構造方法,就是我經常使用的實例化對象模式，好處是咱們調用這個類的時候不用再使用new關鍵字了
  //至關於java裏面的多態，用起來和咱們的靜態方法是同樣的
  factory CategoryBigModel.formJson(dynamic json){
    return CategoryBigModel(
      mallCategoryId:json['mallCategoryId'],
      mallCategoryName:json['mallCategoryName'],
      bxMallSubDto:json['bxMallSubDto'],
      comments:json['comments'],
      image:json['image']
    );
  }
}

//列表的model
class CategoryBigListModel{
  List<CategoryBigModel> data;
  CategoryBigListModel(this.data);

  factory CategoryBigListModel.fromJson(List json){
    return CategoryBigListModel(
      json.map((i)=>CategoryBigModel.formJson((i))).toList()
    );
  }
}