获取Spring-boot系统环境变量方法

    public static ConfigurableApplicationContext  context = null;

    public static void main( String[] args ) throws Exception
    {
        //1. start application
        context = SpringApplication.run( App.class, args );
　　　　　　
        String    selfUrl=App.context.getEnvironment().getProperty("ta.selfcheck.url");
   }