scala - 在 akka 配置中重用变量

Question

如何在其他几个属性中重用配置属性？我的简化现实世界示例如下所示:

myApp {

  host = "www.myfoohost.com"

  urls {
    url1 = host + "/b" // this...
    url2 = host + "/a" // ... and this do not work
  }
}

Answer 1

那叫substitutions在 Typesafe Config 中，它使用 ${}符号:

myApp {
  host = "www.myfoohost.com"

  urls {
    url1 = ${myApp.host}"/b"
    url2 = ${myApp.host}"/a"
  }
}