Flutter移动电商实战 --（22）JSON解析和复杂数据模型转换技巧
json转Model类
创建model文件夹，在里面新建category.dart类
主要根据这个json来分析我们要做成类的样子
{
"code": "0",
"message": "success",
"data": [
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"mallCategoryName": "白酒",
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},
{
"mallSubId": "2c9f6c94679b4fb10167f7fa132b15e7",
"mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
"mallSubName": "坚果炒货",
"comments": null
},
{
"mallSubId": "2c9f6c94679b4fb10167f7f4bfc415e2",
"mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
"mallSubName": "肉干豆干",
"comments": null
},
{
"mallSubId": "2c9f6c94679b4fb10167f7f5027a15e3",
"mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
"mallSubName": "饼干",
"comments": null
},
{
"mallSubId": "2c9f6c94679b4fb10167f7f530fd15e4",
"mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
"mallSubName": "冲调",
"comments": null
},
{
"mallSubId": "2c9f6c94683a6b0d016846b49436003b",
"mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
"mallSubName": "休闲水果",
"comments": null
}
],
"comments": null,
"image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170200_7553.png"
},
{
"mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
"mallCategoryName": "粮油调味",
"bxMallSubDto": [
{
"mallSubId": "2c9f6c946449ea7e01647dd2e8270043",
"mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
"mallSubName": "油/粮食",
"comments": ""
},
{
"mallSubId": "2c9f6c946449ea7e01647dd31bca0044",
"mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
"mallSubName": "调味品",
"comments": ""
},
{
"mallSubId": "2c9f6c946449ea7e01647dd35a980045",
"mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
"mallSubName": "酱菜罐头",
"comments": ""
}
],
"comments": null,
"image": "http://images.baixingliangfan.cn/firstCategoryPicture/20181212/20181212115842_9733.png"
},
{
"mallCategoryId": "2c9f6c9468a85aef016925444ddb271b",
"mallCategoryName": "积分商品",
"bxMallSubDto": [
],
"comments": null,
"image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190225/20190225232703_9950.png"
}
]
}
class CategoryBigModel{
String mallCategoryId;//类别编号
String mallCategoryName;//类别名称
}
comments这个字段都是null值。
所以在创建了的时候 我们直接用null来表示
我们上面只做了一个模型类：CategoryBigModel
在json里面是有多个CategoryBigModel类的。就是一个list的数据。CategoryBigListModel
使用我们定义的model，和model的list集合
我们要输出大类的名称
输出我们的类别
快速生成我们的dart类，数据模型
https://javiercbk.github.io/json_to_dart/
把所有的json复制过来，自动生成类
最终代码
category.dart
class CategoryBigModel{
String mallCategoryId;//类别编号
String mallCategoryName;//类别名称
List<dynamic> bxMallSubDto;//不知道具体模型就用dynamic类型
Null comments;
String image;
//构造方法
CategoryBigModel({
this.mallCategoryId,
this.mallCategoryName,
this.bxMallSubDto,
this.comments,
this.image
});
//工厂类的构造方法,就是我常用的实例化对象模式，好处是我们调用这个类的时候不用再使用new关键字了
//相当于java里面的多态，用起来和我们的静态方法是一样的
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_page.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('分类页面'),
)
);
} 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));
});
}
}
//
class CategoryBigModel{
String mallCategoryId;//类别编号
String mallCategoryName;//类别名称
List<dynamic> bxMallSubDto;//不知道具体模型就用dynamic类型
Null comments;
String image;
//构造方法
CategoryBigModel({
this.mallCategoryId,
this.mallCategoryName,
this.bxMallSubDto,
this.comments,
this.image
});
//工厂类的构造方法,就是我常用的实例化对象模式，好处是我们调用这个类的时候不用再使用new关键字了
//相当于java里面的多态，用起来和我们的静态方法是一样的
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()
);
}
}
.
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