步骤

1.在项目根目录新建jsons文件夹并将json数据新建成为文件，在lib目录下新建包名为models
注意：这两个文件夹的名字都必须为jsons和models

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2.加入依赖

dependencies:
#    json生成model需要的依赖
  json_annotation: ^2.0.0

dev_dependencies
#    json生成model需要的依赖
  build_runner: ^1.0.0
  json_serializable: ^2.0.0
  json_model: ^0.0.2

注意：这里添加完json_serializable相关依赖之后还添加了json_model的依赖，这就是快捷生成的关键，还有如果json中引用了其他model可以使用如下方式，具体可以查看官方地址json_model

{
  "name":"wendux",
  "father":"$user", //可以通过"$"符号引用其它model类
  "friends":"$[]user", // 可以通过"$[]"来引用数组
  "keywords":"$[]String", // 同上
  "age":20
}

3.完成上面的操作之后
在当前项目的根目录执行如下命令

flutter packages pub run json_model

控制太打印如下就成功了

[INFO] Generating build script...
[INFO] Generating build script completed, took 378ms

[INFO] Creating build script snapshot......
[INFO] Creating build script snapshot... completed, took 10.9s

[INFO] Initializing inputs
[INFO] Building new asset graph...
[INFO] Building new asset graph completed, took 657ms

[INFO] Checking for unexpected pre-existing outputs....
[INFO] Checking for unexpected pre-existing outputs. completed, took 1ms

[INFO] Running build...
[INFO] 1.2s elapsed, 0/7 actions completed.
[INFO] 2.2s elapsed, 2/7 actions completed.
[INFO] 5.0s elapsed, 2/7 actions completed.
[INFO] 6.7s elapsed, 5/7 actions completed.
[INFO] Running build completed, took 7.0s

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 62ms

[INFO] Succeeded after 7.1s with 8 outputs (18 actions)

➜  github_client_app flutter packages pub run json_model
[INFO] Generating build script...
[INFO] Generating build script completed, took 440ms

[INFO] Initializing inputs
[INFO] Reading cached asset graph...
[INFO] Reading cached asset graph completed, took 90ms

[INFO] Checking for updates since last build...
[INFO] Checking for updates since last build completed, took 832ms

[INFO] Running build...
[INFO] Running build completed, took 790ms

[INFO] Caching finalized dependency graph...
[INFO] Caching finalized dependency graph completed, took 43ms

[INFO] Succeeded after 841ms with 4 outputs (4 actions)

注意：如果json文件中加了注释可能会报错，需要删除注释，错误信息如下

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