Flutter移动电商实战 --（22）JSON解析和复杂数据模型转换技巧

雨点打透心脏的1/2处 2023-06-01 05:59 21阅读 0赞

json转Model类

创建model文件夹，在里面新建category.dart类

![1090399-20190901162255335-1799308591.png][]

主要根据这个json来分析我们要做成类的样子

{
      "code": "0",
      "message": "success",
      "data": [
        {
          "mallCategoryId": "4",
          "mallCategoryName": "白酒",
          "bxMallSubDto": [
            {
              "mallSubId": "2c9f6c94621970a801626a35cb4d0175",
              "mallCategoryId": "4",
              "mallSubName": "名酒",
              "comments": ""
            },
            {
              "mallSubId": "2c9f6c94621970a801626a363e5a0176",
              "mallCategoryId": "4",
              "mallSubName": "宝丰",
              "comments": ""
            },
            {
              "mallSubId": "2c9f6c94621970a801626a3770620177",
              "mallCategoryId": "4",
              "mallSubName": "北京二锅头",
              "comments": ""
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cc035c15a8",
              "mallCategoryId": "4",
              "mallSubName": "大明",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cc2af915a9",
              "mallCategoryId": "4",
              "mallSubName": "杜康",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cc535115aa",
              "mallCategoryId": "4",
              "mallSubName": "顿丘",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cc77b215ab",
              "mallCategoryId": "4",
              "mallSubName": "汾酒",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cca72e15ac",
              "mallCategoryId": "4",
              "mallSubName": "枫林",
              "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": "贵州大曲",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cd3f2815b0",
              "mallCategoryId": "4",
              "mallSubName": "国池",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cd5d3015b1",
              "mallCategoryId": "4",
              "mallSubName": "国窖",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cd7ced15b2",
              "mallCategoryId": "4",
              "mallSubName": "国台",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cd9b9015b3",
              "mallCategoryId": "4",
              "mallSubName": "汉酱",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cdbfd215b4",
              "mallCategoryId": "4",
              "mallSubName": "红星",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c946891d16801689474e2a70081",
              "mallCategoryId": "4",
              "mallSubName": "怀庄",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cdddf815b5",
              "mallCategoryId": "4",
              "mallSubName": "剑南春",
              "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": "京宫",
              "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": "龙江家园",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cef15c15bc",
              "mallCategoryId": "4",
              "mallSubName": "泸州",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cf156f15bd",
              "mallCategoryId": "4",
              "mallSubName": "鹿邑大曲",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cf425b15be",
              "mallCategoryId": "4",
              "mallSubName": "毛铺",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cf9dc915c0",
              "mallCategoryId": "4",
              "mallSubName": "绵竹",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cfbf1c15c1",
              "mallCategoryId": "4",
              "mallSubName": "难得糊涂",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cfdd7215c2",
              "mallCategoryId": "4",
              "mallSubName": "牛二爷",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7cf71e715bf",
              "mallCategoryId": "4",
              "mallSubName": "茅台",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7d7eda715c3",
              "mallCategoryId": "4",
              "mallSubName": "绵竹",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7d96e5c15c4",
              "mallCategoryId": "4",
              "mallSubName": "难得糊涂",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7dab93b15c5",
              "mallCategoryId": "4",
              "mallSubName": "牛二爷",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7dae16415c6",
              "mallCategoryId": "4",
              "mallSubName": "牛栏山",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7db11cb15c7",
              "mallCategoryId": "4",
              "mallSubName": "前门",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7db430c15c8",
              "mallCategoryId": "4",
              "mallSubName": "全兴",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7db6cac15c9",
              "mallCategoryId": "4",
              "mallSubName": "舍得",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7db9a4415ca",
              "mallCategoryId": "4",
              "mallSubName": "双沟",
              "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": "五粮液",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7dcd9e815d0",
              "mallCategoryId": "4",
              "mallSubName": "西凤",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7dcf6d715d1",
              "mallCategoryId": "4",
              "mallSubName": "习酒",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7dd11b215d2",
              "mallCategoryId": "4",
              "mallSubName": "小白杨",
              "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": "张弓",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7ddd6c715d6",
              "mallCategoryId": "4",
              "mallSubName": "中粮",
              "comments": null
            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7de126815d7",
              "mallCategoryId": "4",
              "mallSubName": "竹叶青",
              "comments": null
            }
          ],
          "comments": null,
          "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170036_4477.png"
        },
        {
          "mallCategoryId": "1",
          "mallCategoryName": "啤酒",
          "bxMallSubDto": [
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              "mallSubId": "2c9f6c946016ea9b016016f79c8e0000",
              "mallCategoryId": "1",
              "mallSubName": "百威",
              "comments": ""
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            {
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              "mallCategoryId": "1",
              "mallSubName": "福佳",
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              "mallSubId": "402880e86016d1b5016016db9b290001",
              "mallCategoryId": "1",
              "mallSubName": "哈尔滨",
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              "mallSubId": "402880e86016d1b5016016dbff2f0002",
              "mallCategoryId": "1",
              "mallSubName": "汉德",
              "comments": ""
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              "mallSubId": "2c9f6c946449ea7e01647cd6830e0022",
              "mallCategoryId": "1",
              "mallSubName": "崂山",
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              "mallCategoryId": "1",
              "mallSubName": "林德曼",
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            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7e1411b15d8",
              "mallCategoryId": "1",
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              "mallSubId": "2c9f6c94679b4fb10167f7e1647215d9",
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              "mallSubName": "乌苏",
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              "mallSubId": "2c9f6c9468118c9c016811ab16bf0001",
              "mallCategoryId": "1",
              "mallSubName": "雪花",
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              "mallSubId": "2c9f6c9468118c9c016811aa6f440000",
              "mallCategoryId": "1",
              "mallSubName": "燕京",
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            {
              "mallSubId": "2c9f6c94679b4fb10167f7e19b8f15db",
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          "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170044_9165.png"
        },
        {
          "mallCategoryId": "2",
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          "bxMallSubDto": [
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              "mallCategoryId": "2",
              "mallSubName": "澳大利亚",
              "comments": ""
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            {
              "mallSubId": "402880e86016d1b5016016e083f10010",
              "mallCategoryId": "2",
              "mallSubName": "德国",
              "comments": ""
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              "mallSubId": "402880e86016d1b5016016df1f92000c",
              "mallCategoryId": "2",
              "mallSubName": "法国",
              "comments": ""
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            {
              "mallSubId": "2c9f6c94621970a801626a40feac0178",
              "mallCategoryId": "2",
              "mallSubName": "南非",
              "comments": ""
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            {
              "mallSubId": "2c9f6c94679b4fb10167f7e5c9a115dc",
              "mallCategoryId": "2",
              "mallSubName": "葡萄牙",
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            {
              "mallSubId": "2c9f6c94679b4fb10167f7e5e68f15dd",
              "mallCategoryId": "2",
              "mallSubName": "西班牙",
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            },
            {
              "mallSubId": "2c9f6c94679b4fb10167f7e609f515de",
              "mallCategoryId": "2",
              "mallSubName": "新西兰",
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            {
              "mallSubId": "2c9f6c94679b4fb10167f7e6286a15df",
              "mallCategoryId": "2",
              "mallSubName": "意大利",
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              "mallSubName": "智利",
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          "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170053_878.png"
        },
        {
          "mallCategoryId": "3",
          "mallCategoryName": "清酒洋酒",
          "bxMallSubDto": [
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              "mallSubId": "402880e86016d1b5016016e135440011",
              "mallCategoryId": "3",
              "mallSubName": "清酒",
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            {
              "mallSubId": "402880e86016d1b5016016e171cc0012",
              "mallCategoryId": "3",
              "mallSubName": "洋酒",
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        {
          "mallCategoryId": "5",
          "mallCategoryName": "保健酒",
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              "mallSubId": "2c9f6c94609a62be0160a02d1dc20021",
              "mallCategoryId": "5",
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              "mallCategoryId": "5",
              "mallSubName": "药酒",
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          ],
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        {
          "mallCategoryId": "2c9f6c946449ea7e01647ccd76a6001b",
          "mallCategoryName": "预调酒",
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              "mallCategoryId": "2c9f6c946449ea7e01647ccd76a6001b",
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            {
              "mallSubId": "2c9f6c946449ea7e01647dd4ac8c0048",
              "mallCategoryId": "2c9f6c946449ea7e01647cd108b60020",
              "mallSubName": "常温纯奶",
              "comments": ""
            },
            {
              "mallSubId": "2c9f6c946449ea7e01647dd4f6a40049",
              "mallCategoryId": "2c9f6c946449ea7e01647cd108b60020",
              "mallSubName": "常温酸奶",
              "comments": ""
            },
            {
              "mallSubId": "2c9f6c946449ea7e01647dd51ab7004a",
              "mallCategoryId": "2c9f6c946449ea7e01647cd108b60020",
              "mallSubName": "低温奶",
              "comments": ""
            }
          ],
          "comments": null,
          "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170151_9234.png"
        },
        {
          "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
          "mallCategoryName": "休闲零食",
          "bxMallSubDto": [
            {
              "mallSubId": "2c9f6c946449ea7e01647dc51d93003c",
              "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
              "mallSubName": "方便食品",
              "comments": ""
            },
            {
              "mallSubId": "2c9f6c946449ea7e01647dd204dc0040",
              "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
              "mallSubName": "面包糕点",
              "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": "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"
        }
      ]
    }

![1090399-20190901162446041-2111184754.png][]

![1090399-20190901162455327-1817011535.png][]

class CategoryBigModel{
      String mallCategoryId;//类别编号
      String mallCategoryName;//类别名称
    }

![1090399-20190901162535823-1679583286.png][]

comments这个字段都是null值。

![1090399-20190901162606084-1182254849.png][]

所以在创建了的时候 我们直接用null来表示

![1090399-20190901162642596-878046718.png][]

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**

**![1090399-20190901162736769-295076844.png][]**

# 使用我们定义的model，和model的list集合 #

![1090399-20190901162905155-184722411.png][]

我们要输出大类的名称

![1090399-20190901162935791-300257405.png][]

输出我们的类别

![1090399-20190901163011159-1804865666.png][]

# 快速生成我们的dart类，数据模型 #

[https://javiercbk.github.io/json\_to\_dart/][https_javiercbk.github.io_json_to_dart]

把所有的json复制过来，自动生成类

![1090399-20190901163056622-1478023884.png][]

# 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));
        });
      }
    }

转载于:https://www.cnblogs.com/crazycode2/p/11391569.html

[1090399-20190901162255335-1799308591.png]: /images/20230601/ecc44baad7f64afda05effcece0de490.png
[1090399-20190901162446041-2111184754.png]: /images/20230601/3fa021c79d5d467aa474aa9245689386.png
[1090399-20190901162455327-1817011535.png]: /images/20230601/abec2fb5d39d4324a30ed0fc2b696327.png
[1090399-20190901162535823-1679583286.png]: /images/20230601/7fc032a38deb4b74a869e887adc9b43a.png
[1090399-20190901162606084-1182254849.png]: /images/20230601/d731fabea12e4e03bd8d97d7d167b4de.png
[1090399-20190901162642596-878046718.png]: /images/20230601/96610673291c4ba2889a949527d0dd63.png
[1090399-20190901162736769-295076844.png]: /images/20230601/e63d17b690fe473589e3ed8f88e97f29.png
[1090399-20190901162905155-184722411.png]: /images/20230601/ef6e8df86e794c828fd0b55309ddd767.png
[1090399-20190901162935791-300257405.png]: /images/20230601/a7d67c724f4549efbc30cc6ebe4ecb19.png
[1090399-20190901163011159-1804865666.png]: /images/20230601/9d645e78f42549228cbd92cd152c5c44.png
[https_javiercbk.github.io_json_to_dart]: https://javiercbk.github.io/json_to_dart/
[1090399-20190901163056622-1478023884.png]: /images/20230601/6caa547f57f64a21804a77eed09c095a.png