如何在Vaadin应用程序中处理post请求?

Question

我的任务是需要在Vaadin应用程序中处理一个post请求这是一个需要处理的请求示例

我不明白如何在Vaadin我可以得到POST或get请求我还找到了关于创建servlet 3.0应用程序的文档——没有找到vadin v23

@Route("/")
@CssImport("./styles/shared-styles.css")
@CssImport(value = "./styles/vaadin-text-field-styles.css", themeFor = "vaadin-text-field")
@Log4j2
public class MainView extends VerticalLayout {
...
public MainView() {

//    VaadinSession.getCurrent().addRequestHandler(
//        new RequestHandler() {
//          @Override
//          public boolean handleRequest(VaadinSession session,
//              VaadinRequest request,
//              VaadinResponse response)
//              throws IOException {
//            if ("/notifications".equals(request.getPathInfo())) {
//              // Generate a plain text document
//              response.setContentType("text/plain");
//              response.getWriter().append(
//                  "Here's some dynamically generated content.n");
//              response.getWriter().format(Locale.ENGLISH,
//                  "Time: %Tcn", new Date());
//
//              // Use shared session data
//              response.getWriter().format("Session data: %sn",
//                  session.getAttribute("mydata"));
//
//              return true; // We wrote a response
//            } else
//              return false; // No response was written
//          }
//        });
}

@WebServlet(value = "/notifications", asyncSupported = true)
public static class Servlet extends VaadinServlet {
@Override
protected void servletInitialized() throws ServletException {
super.servletInitialized();
VaadinServlet servlet = getService().getServlet();
}
}

调用http://localhost:8080/notifications时我得到了

Could not navigate to 'notifications'

在注释代码的帮助下，我设法进入请求处理程序，但我怀疑这是正确的方法

//    VaadinSession.getCurrent().addRequestHandler(
//        new RequestHandler() {
//          @Override
//          public boolean handleRequest(VaadinSession session,
//              VaadinRequest request,
//              VaadinResponse response)
//              throws IOException {
//            if ("/notifications".equals(request.getPathInfo())) {
//              // Generate a plain text document
//              response.setContentType("text/plain");
//              response.getWriter().append(
//                  "Here's some dynamically generated content.n");
//              response.getWriter().format(Locale.ENGLISH,
//                  "Time: %Tcn", new Date());
//
//              // Use shared session data
//              response.getWriter().format("Session data: %sn",
//                  session.getAttribute("mydata"));
//
//              return true; // We wrote a response
//            } else
//              return false; // No response was written
//          }
//        });

Answer 1

我还找到了关于创建servlet 3.0应用程序的文档- Vaadin v23没有找到

这应该仍然可以工作，所以您可以将应用程序映射到例如。http://localhost:8080/app/*这样Vaadin就不会干扰http://localhost:8080/notifications