java - 在运行时设置 application.properties

Question

我需要根据运行环境获取 my.application.dev、my.application.qa 或 my.application:

我的 application.properties 像这样:

application.prod=my.application
application.qa=my.application.qa
application.dev=my.application.dev
application.property=${application.${env.name}}

这是我的代码:

InputStream input = this.getClass().getClassLoader().getResourceAsStream("application.properties");
// Let's say that I have a environment var to determinate if it's running in dev, qa or prod
// At this point, I do something like this String env = System.getenv("envName");

** 我在这里能做的就是用 env** 设置 ${env.name}}

Properties props = new Properties();
props.load(input);
String myValue = props.getProperty("application.property");

有什么想法吗？谢谢

Answer 1

在application.properties中只需定义:

application.prod=my.application
application.qa=my.application.qa
application.dev=my.application.dev

然后读取所需的属性:

String env = System.getProperty("envName");
try (InputStream input = getClass().getClassLoader().getResourceAsStream("application.properties")) {
  Properties props = new Properties();
  props.load(input);
  String value = props.getProperty("application." + env);
  System.out.println(value);
} catch (IOException ex) {
  ex.printStackTrace();
}