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

  1. {
  2.   "code": "0",
  3.   "message": "success",
  4.   "data": [
  5.     {
  6.       "mallCategoryId": "4",
  7.       "mallCategoryName": "白酒",
  8.       "bxMallSubDto": [
  9.         {
  10.           "mallSubId": "2c9f6c94621970a801626a35cb4d0175",
  11.           "mallCategoryId": "4",
  12.           "mallSubName": "名酒",
  13.           "comments": ""
  14.         },
  15.         {
  16.           "mallSubId": "2c9f6c94621970a801626a363e5a0176",
  17.           "mallCategoryId": "4",
  18.           "mallSubName": "宝丰",
  19.           "comments": ""
  20.         },
  21.         {
  22.           "mallSubId": "2c9f6c94621970a801626a3770620177",
  23.           "mallCategoryId": "4",
  24.           "mallSubName": "北京二锅头",
  25.           "comments": ""
  26.         },
  27.         {
  28.           "mallSubId": "2c9f6c94679b4fb10167f7cc035c15a8",
  29.           "mallCategoryId": "4",
  30.           "mallSubName": "大明",
  31.           "comments": null
  32.         },
  33.         {
  34.           "mallSubId": "2c9f6c94679b4fb10167f7cc2af915a9",
  35.           "mallCategoryId": "4",
  36.           "mallSubName": "杜康",
  37.           "comments": null
  38.         },
  39.         {
  40.           "mallSubId": "2c9f6c94679b4fb10167f7cc535115aa",
  41.           "mallCategoryId": "4",
  42.           "mallSubName": "顿丘",
  43.           "comments": null
  44.         },
  45.         {
  46.           "mallSubId": "2c9f6c94679b4fb10167f7cc77b215ab",
  47.           "mallCategoryId": "4",
  48.           "mallSubName": "汾酒",
  49.           "comments": null
  50.         },
  51.         {
  52.           "mallSubId": "2c9f6c94679b4fb10167f7cca72e15ac",
  53.           "mallCategoryId": "4",
  54.           "mallSubName": "枫林",
  55.           "comments": null
  56.         },
  57.         {
  58.           "mallSubId": "2c9f6c94679b4fb10167f7cccae215ad",
  59.           "mallCategoryId": "4",
  60.           "mallSubName": "高粱酒",
  61.           "comments": null
  62.         },
  63.         {
  64.           "mallSubId": "2c9f6c94679b4fb10167f7ccf0d915ae",
  65.           "mallCategoryId": "4",
  66.           "mallSubName": "古井",
  67.           "comments": null
  68.         },
  69.         {
  70.           "mallSubId": "2c9f6c94679b4fb10167f7cd1d6715af",
  71.           "mallCategoryId": "4",
  72.           "mallSubName": "贵州大曲",
  73.           "comments": null
  74.         },
  75.         {
  76.           "mallSubId": "2c9f6c94679b4fb10167f7cd3f2815b0",
  77.           "mallCategoryId": "4",
  78.           "mallSubName": "国池",
  79.           "comments": null
  80.         },
  81.         {
  82.           "mallSubId": "2c9f6c94679b4fb10167f7cd5d3015b1",
  83.           "mallCategoryId": "4",
  84.           "mallSubName": "国窖",
  85.           "comments": null
  86.         },
  87.         {
  88.           "mallSubId": "2c9f6c94679b4fb10167f7cd7ced15b2",
  89.           "mallCategoryId": "4",
  90.           "mallSubName": "国台",
  91.           "comments": null
  92.         },
  93.         {
  94.           "mallSubId": "2c9f6c94679b4fb10167f7cd9b9015b3",
  95.           "mallCategoryId": "4",
  96.           "mallSubName": "汉酱",
  97.           "comments": null
  98.         },
  99.         {
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  101.           "mallCategoryId": "4",
  102.           "mallSubName": "红星",
  103.           "comments": null
  104.         },
  105.         {
  106.           "mallSubId": "2c9f6c946891d16801689474e2a70081",
  107.           "mallCategoryId": "4",
  108.           "mallSubName": "怀庄",
  109.           "comments": null
  110.         },
  111.         {
  112.           "mallSubId": "2c9f6c94679b4fb10167f7cdddf815b5",
  113.           "mallCategoryId": "4",
  114.           "mallSubName": "剑南春",
  115.           "comments": null
  116.         },
  117.         {
  118.           "mallSubId": "2c9f6c94679b4fb10167f7cdfd4815b6",
  119.           "mallCategoryId": "4",
  120.           "mallSubName": "江小白",
  121.           "comments": null
  122.         },
  123.         {
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  125.           "mallCategoryId": "4",
  126.           "mallSubName": "金沙",
  127.           "comments": null
  128.         },
  129.         {
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  131.           "mallCategoryId": "4",
  132.           "mallSubName": "京宫",
  133.           "comments": null
  134.         },
  135.         {
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  137.           "mallCategoryId": "4",
  138.           "mallSubName": "酒鬼",
  139.           "comments": null
  140.         },
  141.         {
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  143.           "mallCategoryId": "4",
  144.           "mallSubName": "口子窖",
  145.           "comments": null
  146.         },
  147.         {
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  149.           "mallCategoryId": "4",
  150.           "mallSubName": "郎酒",
  151.           "comments": null
  152.         },
  153.         {
  154.           "mallSubId": "2c9f6c94679b4fb10167f7ce989e15ba",
  155.           "mallCategoryId": "4",
  156.           "mallSubName": "老口子",
  157.           "comments": null
  158.         },
  159.         {
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  161.           "mallCategoryId": "4",
  162.           "mallSubName": "龙江家园",
  163.           "comments": null
  164.         },
  165.         {
  166.           "mallSubId": "2c9f6c94679b4fb10167f7cef15c15bc",
  167.           "mallCategoryId": "4",
  168.           "mallSubName": "泸州",
  169.           "comments": null
  170.         },
  171.         {
  172.           "mallSubId": "2c9f6c94679b4fb10167f7cf156f15bd",
  173.           "mallCategoryId": "4",
  174.           "mallSubName": "鹿邑大曲",
  175.           "comments": null
  176.         },
  177.         {
  178.           "mallSubId": "2c9f6c94679b4fb10167f7cf425b15be",
  179.           "mallCategoryId": "4",
  180.           "mallSubName": "毛铺",
  181.           "comments": null
  182.         },
  183.         {
  184.           "mallSubId": "2c9f6c94679b4fb10167f7cf9dc915c0",
  185.           "mallCategoryId": "4",
  186.           "mallSubName": "绵竹",
  187.           "comments": null
  188.         },
  189.         {
  190.           "mallSubId": "2c9f6c94679b4fb10167f7cfbf1c15c1",
  191.           "mallCategoryId": "4",
  192.           "mallSubName": "难得糊涂",
  193.           "comments": null
  194.         },
  195.         {
  196.           "mallSubId": "2c9f6c94679b4fb10167f7cfdd7215c2",
  197.           "mallCategoryId": "4",
  198.           "mallSubName": "牛二爷",
  199.           "comments": null
  200.         },
  201.         {
  202.           "mallSubId": "2c9f6c94679b4fb10167f7cf71e715bf",
  203.           "mallCategoryId": "4",
  204.           "mallSubName": "茅台",
  205.           "comments": null
  206.         },
  207.         {
  208.           "mallSubId": "2c9f6c94679b4fb10167f7d7eda715c3",
  209.           "mallCategoryId": "4",
  210.           "mallSubName": "绵竹",
  211.           "comments": null
  212.         },
  213.         {
  214.           "mallSubId": "2c9f6c94679b4fb10167f7d96e5c15c4",
  215.           "mallCategoryId": "4",
  216.           "mallSubName": "难得糊涂",
  217.           "comments": null
  218.         },
  219.         {
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  221.           "mallCategoryId": "4",
  222.           "mallSubName": "牛二爷",
  223.           "comments": null
  224.         },
  225.         {
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  227.           "mallCategoryId": "4",
  228.           "mallSubName": "牛栏山",
  229.           "comments": null
  230.         },
  231.         {
  232.           "mallSubId": "2c9f6c94679b4fb10167f7db11cb15c7",
  233.           "mallCategoryId": "4",
  234.           "mallSubName": "前门",
  235.           "comments": null
  236.         },
  237.         {
  238.           "mallSubId": "2c9f6c94679b4fb10167f7db430c15c8",
  239.           "mallCategoryId": "4",
  240.           "mallSubName": "全兴",
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  242.         },
  243.         {
  244.           "mallSubId": "2c9f6c94679b4fb10167f7db6cac15c9",
  245.           "mallCategoryId": "4",
  246.           "mallSubName": "舍得",
  247.           "comments": null
  248.         },
  249.         {
  250.           "mallSubId": "2c9f6c94679b4fb10167f7db9a4415ca",
  251.           "mallCategoryId": "4",
  252.           "mallSubName": "双沟",
  253.           "comments": null
  254.         },
  255.         {
  256.           "mallSubId": "2c9f6c94679b4fb10167f7dc30b815cb",
  257.           "mallCategoryId": "4",
  258.           "mallSubName": "水井坊",
  259.           "comments": null
  260.         },
  261.         {
  262.           "mallSubId": "2c9f6c94679b4fb10167f7dc543e15cc",
  263.           "mallCategoryId": "4",
  264.           "mallSubName": "四特",
  265.           "comments": null
  266.         },
  267.         {
  268.           "mallSubId": "2c9f6c94679b4fb10167f7dc765c15cd",
  269.           "mallCategoryId": "4",
  270.           "mallSubName": "潭酒",
  271.           "comments": null
  272.         },
  273.         {
  274.           "mallSubId": "2c9f6c94679b4fb10167f7dc988a15ce",
  275.           "mallCategoryId": "4",
  276.           "mallSubName": "沱牌",
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  279.         {
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  281.           "mallCategoryId": "4",
  282.           "mallSubName": "五粮液",
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  285.         {
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  287.           "mallCategoryId": "4",
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  291.         {
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  293.           "mallCategoryId": "4",
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  297.         {
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  336.     },
  337.     {
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  340.       "bxMallSubDto": [
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  529.         {
  530.           "mallSubId": "2c9f6c946449ea7e01647d02f6250026",
  531.           "mallCategoryId": "2c9f6c946449ea7e01647ccd76a6001b",
  532.           "mallSubName": "果酒",
  533.           "comments": ""
  534.         },
  535.         {
  536.           "mallSubId": "2c9f6c946449ea7e01647d031bae0027",
  537.           "mallCategoryId": "2c9f6c946449ea7e01647ccd76a6001b",
  538.           "mallSubName": "鸡尾酒",
  539.           "comments": ""
  540.         },
  541.         {
  542.           "mallSubId": "2c9f6c946449ea7e01647d03428f0028",
  543.           "mallCategoryId": "2c9f6c946449ea7e01647ccd76a6001b",
  544.           "mallSubName": "米酒",
  545.           "comments": ""
  546.         }
  547.       ],
  548.       "comments": null,
  549.       "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170124_4760.png"
  550.     },
  551.     {
  552.       "mallCategoryId": "2c9f6c946449ea7e01647ccf3b97001d",
  553.       "mallCategoryName": "下酒小菜",
  554.       "bxMallSubDto": [
  555.         {
  556.           "mallSubId": "2c9f6c946449ea7e01647dc18e610035",
  557.           "mallCategoryId": "2c9f6c946449ea7e01647ccf3b97001d",
  558.           "mallSubName": "熟食",
  559.           "comments": ""
  560.         },
  561.         {
  562.           "mallSubId": "2c9f6c946449ea7e01647dc1d9070036",
  563.           "mallCategoryId": "2c9f6c946449ea7e01647ccf3b97001d",
  564.           "mallSubName": "火腿",
  565.           "comments": ""
  566.         },
  567.         {
  568.           "mallSubId": "2c9f6c946449ea7e01647dc1fc3e0037",
  569.           "mallCategoryId": "2c9f6c946449ea7e01647ccf3b97001d",
  570.           "mallSubName": "速冻食品",
  571.           "comments": ""
  572.         }
  573.       ],
  574.       "comments": null,
  575.       "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170133_4419.png"
  576.     },
  577.     {
  578.       "mallCategoryId": "2c9f6c946449ea7e01647ccdb0e0001c",
  579.       "mallCategoryName": "饮料",
  580.       "bxMallSubDto": [
  581.         {
  582.           "mallSubId": "2c9f6c946449ea7e01647d09cbf6002d",
  583.           "mallCategoryId": "2c9f6c946449ea7e01647ccdb0e0001c",
  584.           "mallSubName": "茶饮",
  585.           "comments": ""
  586.         },
  587.         {
  588.           "mallSubId": "2c9f6c946449ea7e01647d09f7e8002e",
  589.           "mallCategoryId": "2c9f6c946449ea7e01647ccdb0e0001c",
  590.           "mallSubName": "水饮",
  591.           "comments": ""
  592.         },
  593.         {
  594.           "mallSubId": "2c9f6c946449ea7e01647d0a27e1002f",
  595.           "mallCategoryId": "2c9f6c946449ea7e01647ccdb0e0001c",
  596.           "mallSubName": "功能饮料",
  597.           "comments": ""
  598.         },
  599.         {
  600.           "mallSubId": "2c9f6c946449ea7e01647d0b1d4d0030",
  601.           "mallCategoryId": "2c9f6c946449ea7e01647ccdb0e0001c",
  602.           "mallSubName": "果汁",
  603.           "comments": ""
  604.         },
  605.         {
  606.           "mallSubId": "2c9f6c946449ea7e01647d14192b0031",
  607.           "mallCategoryId": "2c9f6c946449ea7e01647ccdb0e0001c",
  608.           "mallSubName": "含乳饮料",
  609.           "comments": ""
  610.         },
  611.         {
  612.           "mallSubId": "2c9f6c946449ea7e01647d24d9600032",
  613.           "mallCategoryId": "2c9f6c946449ea7e01647ccdb0e0001c",
  614.           "mallSubName": "碳酸饮料",
  615.           "comments": ""
  616.         }
  617.       ],
  618.       "comments": null,
  619.       "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170143_361.png"
  620.     },
  621.     {
  622.       "mallCategoryId": "2c9f6c946449ea7e01647cd108b60020",
  623.       "mallCategoryName": "乳制品",
  624.       "bxMallSubDto": [
  625.         {
  626.           "mallSubId": "2c9f6c946449ea7e01647dd4ac8c0048",
  627.           "mallCategoryId": "2c9f6c946449ea7e01647cd108b60020",
  628.           "mallSubName": "常温纯奶",
  629.           "comments": ""
  630.         },
  631.         {
  632.           "mallSubId": "2c9f6c946449ea7e01647dd4f6a40049",
  633.           "mallCategoryId": "2c9f6c946449ea7e01647cd108b60020",
  634.           "mallSubName": "常温酸奶",
  635.           "comments": ""
  636.         },
  637.         {
  638.           "mallSubId": "2c9f6c946449ea7e01647dd51ab7004a",
  639.           "mallCategoryId": "2c9f6c946449ea7e01647cd108b60020",
  640.           "mallSubName": "低温奶",
  641.           "comments": ""
  642.         }
  643.       ],
  644.       "comments": null,
  645.       "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170151_9234.png"
  646.     },
  647.     {
  648.       "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
  649.       "mallCategoryName": "休闲零食",
  650.       "bxMallSubDto": [
  651.         {
  652.           "mallSubId": "2c9f6c946449ea7e01647dc51d93003c",
  653.           "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
  654.           "mallSubName": "方便食品",
  655.           "comments": ""
  656.         },
  657.         {
  658.           "mallSubId": "2c9f6c946449ea7e01647dd204dc0040",
  659.           "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
  660.           "mallSubName": "面包糕点",
  661.           "comments": ""
  662.         },
  663.         {
  664.           "mallSubId": "2c9f6c946449ea7e01647dd22f760041",
  665.           "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
  666.           "mallSubName": "糖果巧克力",
  667.           "comments": ""
  668.         },
  669.         {
  670.           "mallSubId": "2c9f6c946449ea7e01647dd254530042",
  671.           "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
  672.           "mallSubName": "膨化食品",
  673.           "comments": ""
  674.         },
  675.         {
  676.           "mallSubId": "2c9f6c94679b4fb10167f7fa132b15e7",
  677.           "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
  678.           "mallSubName": "坚果炒货",
  679.           "comments": null
  680.         },
  681.         {
  682.           "mallSubId": "2c9f6c94679b4fb10167f7f4bfc415e2",
  683.           "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
  684.           "mallSubName": "肉干豆干",
  685.           "comments": null
  686.         },
  687.         {
  688.           "mallSubId": "2c9f6c94679b4fb10167f7f5027a15e3",
  689.           "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
  690.           "mallSubName": "饼干",
  691.           "comments": null
  692.         },
  693.         {
  694.           "mallSubId": "2c9f6c94679b4fb10167f7f530fd15e4",
  695.           "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
  696.           "mallSubName": "冲调",
  697.           "comments": null
  698.         },
  699.         {
  700.           "mallSubId": "2c9f6c94683a6b0d016846b49436003b",
  701.           "mallCategoryId": "2c9f6c946449ea7e01647ccfddb3001e",
  702.           "mallSubName": "休闲水果",
  703.           "comments": null
  704.         }
  705.       ],
  706.       "comments": null,
  707.       "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190131/20190131170200_7553.png"
  708.     },
  709.     {
  710.       "mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
  711.       "mallCategoryName": "粮油调味",
  712.       "bxMallSubDto": [
  713.         {
  714.           "mallSubId": "2c9f6c946449ea7e01647dd2e8270043",
  715.           "mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
  716.           "mallSubName": "油/粮食",
  717.           "comments": ""
  718.         },
  719.         {
  720.           "mallSubId": "2c9f6c946449ea7e01647dd31bca0044",
  721.           "mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
  722.           "mallSubName": "调味品",
  723.           "comments": ""
  724.         },
  725.         {
  726.           "mallSubId": "2c9f6c946449ea7e01647dd35a980045",
  727.           "mallCategoryId": "2c9f6c946449ea7e01647cd08369001f",
  728.           "mallSubName": "酱菜罐头",
  729.           "comments": ""
  730.         }
  731.       ],
  732.       "comments": null,
  733.       "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20181212/20181212115842_9733.png"
  734.     },
  735.     {
  736.       "mallCategoryId": "2c9f6c9468a85aef016925444ddb271b",
  737.       "mallCategoryName": "积分商品",
  738.       "bxMallSubDto": [
  739.  
  740.       ],
  741.       "comments": null,
  742.       "image": "http://images.baixingliangfan.cn/firstCategoryPicture/20190225/20190225232703_9950.png"
  743.     }
  744.   ]
  745. }

  1. class CategoryBigModel{
  2.   String mallCategoryId;//类别编号
  3.   String mallCategoryName;//类别名称
  4. }

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

  1. class CategoryBigModel{
  2.   String mallCategoryId;//类别编号
  3.   String mallCategoryName;//类别名称
  4.   List<dynamic> bxMallSubDto;//不知道具体模型就用dynamic类型
  5.   Null comments;
  6.   String image;
  7.  
  8.   //构造方法
  9.   CategoryBigModel({
  10.     this.mallCategoryId,
  11.     this.mallCategoryName,
  12.     this.bxMallSubDto,
  13.     this.comments,
  14.     this.image
  15.   });
  16.   //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
  17.   //相当于java里面的多态，用起来和我们的静态方法是一样的
  18.   factory CategoryBigModel.formJson(dynamic json){
  19.     return CategoryBigModel(
  20.       mallCategoryId:json['mallCategoryId'],
  21.       mallCategoryName:json['mallCategoryName'],
  22.       bxMallSubDto:json['bxMallSubDto'],
  23.       comments:json['comments'],
  24.       image:json['image']
  25.     );
  26.   }
  27. }
  28.  
  29. //列表的model
  30. class CategoryBigListModel{
  31.   List<CategoryBigModel> data;
  32.   CategoryBigListModel(this.data);
  33.  
  34.   factory CategoryBigListModel.fromJson(List json){
  35.     return CategoryBigListModel(
  36.       json.map((i)=>CategoryBigModel.formJson((i))).toList()
  37.     );
  38.   }
  39. }

category_page.dart

  1. import 'package:flutter/material.dart';
  2. import '../service/service_method.dart';
  3. import 'dart:convert';
  4. import '../model/category.dart';
  5.  
  6. class CategoryPage extends StatefulWidget {
  7.   @override
  8.   _CategoryPageState createState() => _CategoryPageState();
  9. }
  10.  
  11. class _CategoryPageState extends State<CategoryPage> {
  12.   @override
  13.   Widget build(BuildContext context) {
  14.     _getCategory();
  15.     return Container(
  16.       child:Center(
  17.         child: Text('分类页面'),
  18.       )
  19.     );
  20.   }
  21.  
  22.   void _getCategory() async{
  23.     await request('getCategory').then((val){
  24.       var data=json.decode(val.toString());
  25.       //print(data);
  26.       CategoryBigListModel list= CategoryBigListModel.fromJson(data['data']);
  27.       list.data.forEach((item)=>print(item.mallCategoryName));
  28.     });
  29.   }
  30. }

//

  1. class CategoryBigModel{
  2.   String mallCategoryId;//类别编号
  3.   String mallCategoryName;//类别名称
  4.   List<dynamic> bxMallSubDto;//不知道具体模型就用dynamic类型
  5.   Null comments;
  6.   String image;
  7.  
  8.   //构造方法
  9.   CategoryBigModel({
  10.     this.mallCategoryId,
  11.     this.mallCategoryName,
  12.     this.bxMallSubDto,
  13.     this.comments,
  14.     this.image
  15.   });
  16.   //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
  17.   //相当于java里面的多态，用起来和我们的静态方法是一样的
  18.   factory CategoryBigModel.formJson(dynamic json){
  19.     return CategoryBigModel(
  20.       mallCategoryId:json['mallCategoryId'],
  21.       mallCategoryName:json['mallCategoryName'],
  22.       bxMallSubDto:json['bxMallSubDto'],
  23.       comments:json['comments'],
  24.       image:json['image']
  25.     );
  26.   }
  27. }
  28.  
  29. //列表的model
  30. class CategoryBigListModel{
  31.   List<CategoryBigModel> data;
  32.   CategoryBigListModel(this.data);
  33.  
  34.   factory CategoryBigListModel.fromJson(List json){
  35.     return CategoryBigListModel(
  36.       json.map((i)=>CategoryBigModel.formJson((i))).toList()
  37.     );
  38.   }
  39. }

.

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