在 Struts2 中加载长时间运行的初始化数据时如何避免 WSOD(空白屏幕)?

I am looking for a way to do in Action class something like this:

public class LinkAction extends ActionSupport implements SessionAware {
        @Autowired
        private ServiceDelegate myService;

    public String welcome()
        {
            new Runnable() {
                @Override
                public void run() {
                    myService.getLoadsOfData();

                    //redirect to the next action

                }
            }.run();
            // this is where the user 
            // goes to look at the welcome screen        
            return "welcome";
        }
    }

可能这是一个错误的方法，如果是，请告诉我，我是 Struts 的新手.