Servlet3.0 的异步,实战中有哪些场景呢

public class AsyncServlet extends HttpServlet { @Override public void init(ServletConfig config) throws ServletException { super.init(config); System.out.println("AsyncServlet init---> get Param"+config.getInitParameter("name")); }

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {

    AsyncContext asyncContext = req.startAsync();
    PrintWriter writer = resp.getWriter();
    asyncContext.start(()->{
        try {
            TimeUnit.SECONDS.sleep(3);
            System.out.println(Thread.currentThread().getName()+"async run......");
            resp.setContentType("text/html");
            resp.setCharacterEncoding("UTF-8");
            //我的数据库io都在这里操作，io依然是同步的，但是我这样写，就是异步线程去处理这个请求了。
            //我想问，这样写法是可行的吗
            writer.println("async fuck you too");
            writer.flush();
            asyncContext.complete();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    });

    System.out.println(Thread.currentThread().getName()+"stand run......");
    resp.setContentType("text/html");
    resp.setCharacterEncoding("UTF-8");
    writer.println("async fuck you");
    writer.flush();

}

}