Question

我想从桌面应用程序登录到wicket网页。因此，我想定期检查是否存在某些特定参数。

但是当我运行我的代码时，会抛出以下异常。

Exception in thread "Thread-13" org.apache.wicket.WicketRuntimeException: There is no application attached to current thread Thread-13

这是我的代码：

public class SignIn extends WebPage {
public SignIn()
{

    // Create feedback panel and add to page
    add(new FeedbackPanel("feedback"));

    // Add sign-in form to page
    add(new SignInForm("signInForm"));
    startLoginChecker(new LoginRunnable());

}

/**
 * Sign in form
 */
public final class SignInForm extends Form<Void>
{
    private static final String USERNAME = "username";
    private static final String PASSWORD = "password";

    // El-cheapo model for form
    private final ValueMap properties = new ValueMap();

    /**
     * Constructor
     *
     * @param id
     *            id of the form component
     */
    public SignInForm(final String id)
    {
        super(id);

        // Attach textfield components that edit properties map model
        add(new TextField<String>(USERNAME, new PropertyModel<String>(properties, USERNAME)));
        add(new PasswordTextField(PASSWORD, new PropertyModel<String>(properties, PASSWORD)));
    }

    /**
     * @see org.apache.wicket.markup.html.form.Form#onSubmit()
     */
    @Override
    public final void onSubmit()
    {
        // Get session info
        SignInSession session = getMySession();

        // Sign the user in
        if (session.signIn(getUsername(), getPassword()))
        {

                setResponsePage(getApplication().getHomePage());

        }
        else
        {
            // Get the error message from the properties file associated with the Component
            String errmsg = getString("loginError", null, "Unable to sign you in");

            // Register the error message with the feedback panel
            error(errmsg);
        }
    }

    /**
     * @return
     */
    private String getPassword()
    {
        return properties.getString(PASSWORD);
    }

    /**
     * @return
     */
    private String getUsername()
    {
        return properties.getString(USERNAME);
    }

    /**
     * @return
     */
    private SignInSession getMySession()
    {
        return (SignInSession)getSession();
    }
}

public void startLoginChecker(Runnable runnable) {
    Thread loginThread = new Thread(runnable);
    loginThread.start();
}

private class LoginRunnable implements Runnable {
    private int checkLoginPeriod = 1000; //1sec in milliseconds
    @Override
    public void run() {
        try {
            Thread.sleep(checkLoginPeriod);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        final SignInSession session = (SignInSession)getSession();

        while(!session.isSignedIn()) {
            if (session.signIn("wicket", "wicket"))

            {

                setResponsePage(getApplication().getHomePage());

            } else

            {
                // Get the error message from the properties file associated with the Component
                String errmsg = getString("loginError", null, "Unable to sign you in");

                // Register the error message with the feedback panel
                error(errmsg);
            }
        }

    }

}

}

如何避免此问题并定期从线程中检查多个参数。

格拉西亚斯提前。

Answer 1

我认为您应该使用AjaxSelfUpdatingTimerBehavior来实现所需的功能。在这种情况下（因为你要移动到另一个页面），我认为使用它的超类更合适：AbstractAjaxTimerBehavior

只需将其添加到您的Page / Panel

即可

  add(new AbstractAjaxTimerBehavior(Duration.seconds(1)){

      protected void onTimer(AjaxRequestTarget target)
      {
          // Get session info
          SignInSession session = getMySession();              
          // Sign the user in
          if (session.signIn(getUsername(), getPassword()))
          {
              setResponsePage(getApplication().getHomePage());
          }
      }
  });

Answer 2

我想是的：

将页面中的（应用程序应用程序）带到线程池，在池中添加if：

if (!Application.exists()) {
    ThreadContext.setApplication(application);
}

Wicket：当前线程没有附加应用程序

2 个答案: