29.列表页_商品列表数据模型建立
简历数据模型
json生成dart类的网站：
https://javiercbk.github.io/json_to_dart/
json数据
{"code":"0","message":"success","data":[{"image":"http://images.baixingliangfan.cn/compressedPic/20190116145309_40.jpg","oriPrice":2.50,"presentPrice":1.80,"goodsName":"哈尔滨冰爽啤酒330ml","goodsId":"3194330cf25f43c3934dbb8c2a964ade"},{"image":"http://images.baixingliangfan.cn/compressedPic/20190115185215_1051.jpg","oriPrice":2.00,"presentPrice":1.80,"goodsName":"燕京啤酒8°330ml","goodsId":"522a3511f4c545ab9547db074bb51579"},{"image":"http://images.baixingliangfan.cn/compressedPic/20190121102419_9362.jpg","oriPrice":1.98,"presentPrice":1.80,"goodsName":"崂山清爽8°330ml","goodsId":"bbdbd5028cc849c2998ff84fb55cb934"},{"image":"http://images.baixingliangfan.cn/compressedPic/20180712181330_9746.jpg","oriPrice":2.50,"presentPrice":1.90,"goodsName":"雪花啤酒8°清爽330ml","goodsId":"87013c4315e54927a97e51d0645ece76"},{"image":"http://images.baixingliangfan.cn/compressedPic/20180712180233_4501.jpg","oriPrice":2.50,"presentPrice":2.20,"goodsName":"崂山啤酒8°330ml","goodsId":"86388a0ee7bd4a9dbe79f4a38c8acc89"},{"image":"http://images.baixingliangfan.cn/compressedPic/20190116164250_1839.jpg","oriPrice":2.50,"presentPrice":2.30,"goodsName":"哈尔滨小麦王10°330ml","goodsId":"d31a5a337d43433385b17fe83ce2676a"},{"image":"http://images.baixingliangfan.cn/compressedPic/20180712181139_2653.jpg","oriPrice":2.70,"presentPrice":2.50,"goodsName":"三得利清爽啤酒10°330ml","goodsId":"74a1fb6adc1f458bb6e0788c4859bf54"},{"image":"http://images.baixingliangfan.cn/compressedPic/20190121162731_3928.jpg","oriPrice":2.75,"presentPrice":2.50,"goodsName":"三得利啤酒7.5度超纯啤酒330ml","goodsId":"d52fa8ba9a5f40e6955be9e28a764f34"},{"image":"http://images.baixingliangfan.cn/compressedPic/20180712180452_721.jpg","oriPrice":4.50,"presentPrice":3.70,"goodsName":"青岛啤酒11°330ml","goodsId":"a42c0585015540efa7e9642ec1183940"},{"image":"http://images.baixingliangfan.cn/compressedPic/20190121170407_7423.jpg","oriPrice":4.40,"presentPrice":4.00,"goodsName":"三得利清爽啤酒500ml 10.0°","goodsId":"94ec3df73f4446b5a5f0d80a8e51eb9d"},{"image":"http://images.baixingliangfan.cn/compressedPic/20180712181427_6101.jpg","oriPrice":4.50,"presentPrice":4.00,"goodsName":"雪花勇闯天涯啤酒8°330ml","goodsId":"d80462faab814ac6a7124cec3b868cf7"},{"image":"http://images.baixingliangfan.cn/compressedPic/20180717151537_3425.jpg","oriPrice":4.90,"presentPrice":4.10,"goodsName":"百威啤酒听装9.7°330ml","goodsId":"91a849140de24546b0de9e23d85399a3"},{"image":"http://images.baixingliangfan.cn/compressedPic/20190121101926_2942.jpg","oriPrice":4.95,"presentPrice":4.50,"goodsName":"崂山啤酒8°500ml","goodsId":"3758bbd933b145f2a9c472bf76c4920c"},{"image":"http://images.baixingliangfan.cn/compressedPic/20180712175422_518.jpg","oriPrice":5.00,"presentPrice":4.50,"goodsName":"百威3.6%大瓶9.7°P460ml","goodsId":"dc32954b66814f40977be0255cfdacca"},{"image":"http://images.baixingliangfan.cn/compressedPic/20180717151454_4834.jpg","oriPrice":5.00,"presentPrice":4.50,"goodsName":"青岛啤酒大听装500ml","goodsId":"fc85510c3af7428dbf1cb0c1bcb43711"},{"image":"http://images.baixingliangfan.cn/compressedPic/20180712181007_4229.jpg","oriPrice":5.50,"presentPrice":5.00,"goodsName":"三得利金纯生啤酒580ml 9°","goodsId":"14bd89f066ca4949af5e4d5a1d2afaf8"},{"image":"http://images.baixingliangfan.cn/compressedPic/20190121100752_4292.jpg","oriPrice":6.60,"presentPrice":6.00,"goodsName":"哈尔滨啤酒冰纯白啤（小麦啤酒）500ml","goodsId":"89bccd56a8e9465692ccc469cd4b442e"},{"image":"http://images.baixingliangfan.cn/compressedPic/20180712175656_777.jpg","oriPrice":7.20,"presentPrice":6.60,"goodsName":"百威啤酒500ml","goodsId":"3a94dea560ef46008dad7409d592775d"},{"image":"http://images.baixingliangfan.cn/compressedPic/20180712180754_2838.jpg","oriPrice":7.78,"presentPrice":7.00,"goodsName":"青岛啤酒皮尔森10.5°330ml","goodsId":"97adb29137fb47689146a397e5351926"},{"image":"http://images.baixingliangfan.cn/compressedPic/20190116164149_2165.jpg","oriPrice":7.78,"presentPrice":7.00,"goodsName":"青岛全麦白啤11°500ml","goodsId":"f78826d3eb0546f6a2e58893d4a41b43"}]}
生成实体类
在model文件夹下新建
新建类：categoryGoodsList.dart。把网站自动生成的类复制过来，然后修改类的名称为CategoryGoodsListModel
修改前：Data类我们也要修改名字
修改后：
这样上线一些泛型的地方也需要修改
category_page.dart
引入我们刚才创建的实体类
import '../model/categoryGoodsList.dart';
修改商品列表的方法
json转model类
