在 Kotlin 中读取 YAML 文件

Reading from a YAML file in Kotlin

我很难弄清楚如何在 Kotlin 中读取 YAML 文件。

简而言之,YAML 具有以下格式:

aws:
  foo:
    dev:
      id: '1111'
    pro:
      id: '2222'
  bar:
    dev:
      id: '3333'
    pro:
      id: '4444'

我创建了这些数据类:

data class Account (
        val id: String
)

data class Owner (
        val accounts: List<Account>
)

data class Cloud (
        val owners: List<Owner>
)

然后我尝试用以下方法解析文件:

val mapper = ObjectMapper().registerModule(KotlinModule())
val settings: Cloud = mapper.readValue(Path.of("accounts.yaml").toFile())
# also tried this
val settings: List<Cloud> = mapper.readValue(Path.of("accounts.yaml").toFile())
println(settings)

println 失败 Exception in thread "main" com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'aws': was expecting (JSON String, Number, Array, Object or token 'null', 'true' or 'false')

为什么?

您需要包含 jackson-dataformat-yaml 依赖项,然后像这样创建您的 ObjectMapper:

val mapper = ObjectMapper(YAMLFactory()).registerModule(KotlinModule())