如何以编程方式重写Spring Boot Application.Properties？

Question

spring.datasource.url=jdbc:mysql://localhost/mydb
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

Spring批道具也是如此：

database.driver=com.mysql.jdbc.Driver
database.url=jdbc:mysql://localhost/mydv
database.username=root
database.password=root

Answer 1

可以在响应ApplicationEnvironmentPrepared事件的生命周期侦听器中添加其他属性源。

类似于：

public class DatabasePropertiesListener implements ApplicationListener<ApplicationEnvironmentPreparedEvent> {
  public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
    ConfigurableEnvironment environment = event.getEnvironment();
    Properties props = new Properties();
    props.put("spring.datasource.url", "<my value>");
    environment.getPropertySources().addFirst(new PropertiesPropertySource("myProps", props));
  }
}

然后在src/main/resources/meta-inf/spring.factors中注册该类：

org.springframework.context.ApplicationListener=my.package.DatabasePropertiesListener