springboot---->获取不到yml配置文件指定的值

 1 import org.springframework.boot.SpringApplication;
 2 import org.springframework.boot.autoconfigure.SpringBootApplication;
 3 @SpringBootApplication 
 4 public class App {
 5      public static void main(String[] args) {
 6         SpringApplication app = new SpringApplication(App.class);
 7         ConfigurableApplicationContext context = app.run(args);
 8         System.out.println(context.getEnvironment().getProperty("jdbc.pwd"));  
 9         context.close();
10     }
11 }

apllication.yml 放置在classpath路径下
1 jdbc:
2   pwd: 123456  #冒号和数字之间有一个空格，没有否则获取失败，pwd前面有缩进两个字符

ps:版本spring-4.3.2-release,springboot-1.4