java - 无法使用 Vaadin 导航器进行重定向

Question

我有一个非常奇怪的行为，我认为我有两个问题，我将它们放在同一篇文章中，因为它们可以链接:

我的代码是:

VaadinSession.getCurrent().setAttribute("user", user);
System.out.println("User :"+ user);
getUI().getNavigator().navigateTo(HomePageView.HOMEPAGE);

<强>1。第一期

我在登录页面上，可以看到我的用户信息，但无法导航到主页。我没有任何错误!

如果我删除带有 vaadinSession 的行，则导航器正在工作...

<强>2。第二期

我尝试调试我的代码，但收到“找不到源”消息，为了解决这个问题，我按照 Eclipse java debugging: source not found 操作。但是，似乎对我有用。我做了什么:

• 我重新创建了一个新工作区，但没有成功。
• 我编辑了源查找路径，其中有我的 java 项目
• 在首选项 -> java -> 安装 JRE -> 我有 1.8.0 JDK
• 右键单击项目 -> maven -> 下载源
• 右键单击项目 -> maven -> 禁用 maven 性质，然后配置 -> 项目到 maven

编辑:问题 2 的解决方案: 我被阻止了......我知道这是一个 eclipse 问题(配置或类似的问题)。我换成了IntelliJ。这个 IDE 可以毫无问题地向我显示源代码。

信息

我正在使用 Vaadin 和 REST Web 服务(使用 javax.ws.rs.client.ClientBuilder)。当我使用 SYSOUT 时，我有很好的信息。我从主页收到信息(而不是 View 似乎保留登录 View )。

任何提示都会非常有用!

<小时/>

编辑:完整的 LoginView 类

package com.test.project.View;

import com.test.project.model.User;
import com.test.project.restclient.RestClient;
import com.vaadin.annotations.Title;
import com.vaadin.data.Binder;
import com.vaadin.data.validator.EmailValidator;
import com.vaadin.icons.VaadinIcons;
import com.vaadin.navigator.View;
import com.vaadin.navigator.ViewChangeListener.ViewChangeEvent;
import com.vaadin.server.VaadinSession;
import com.vaadin.ui.Alignment;
import com.vaadin.ui.Button;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.Panel;
import com.vaadin.ui.TextField;
import com.vaadin.ui.VerticalLayout;


    /**
     * Login View. The user should enter his email address. Extends {@link CustomComponent} and implements {@link View}
     * 
     * @author Bob
     */
    @Title("Sign Up")
    public class LoginView extends CustomComponent implements
            View {

        private static final long serialVersionUID = 1L;

        public static final String LOGIN = "";

        private VerticalLayout vLayout = new VerticalLayout();

        private static final String SIGNUP_LABEL = "Sign Up";
        private static final String EMAIL_CAPTION = "Type your email here :";
        private static final String SIGNIN_LABEL = "Sign In";
        private TextField email;
        private static final String TOKEN_ATTRIBUTE_LABEL = "token";

        private final Binder<User> binder = new Binder<>();
        private User user;

        private Button loginButton;

        /**
         * Login view Constructor
         */
        public LoginView() {
            createLoginPanel();
            addListener();
        }

        /**
         * Add Listener concern by the Login View Fields
         */
        private void addListener() {
            loginButton.addClickListener(e -> {
                RestClient rc = new RestClient();
                user = rc.getUserInfo(email.getValue());
                VaadinSession.getCurrent().setAttribute(TOKEN_ATTRIBUTE_LABEL, user.getToken());
                System.out.println();
                getUI().getNavigator().navigateTo(HomePageView.HOMEPAGE);
            });
        }

        /**
         * Create the login panel with the email field and the login button
         */
        private void createLoginPanel() {
            final VerticalLayout layout = new VerticalLayout();
            layout.setSizeFull();

            Panel panel = new Panel(SIGNUP_LABEL);
            panel.setHeight(200, Unit.PIXELS);
            panel.setWidth(300, Unit.PIXELS);

            email = new TextField();
            email.setCaption(EMAIL_CAPTION);
            email.setHeight(30, Unit.PIXELS);
            email.setWidth(275, Unit.PIXELS);
            binder.forField(email).withValidator(new EmailValidator("This doesn't look like a valid email address")).bind(User::getEmail, User::setEmail);

            loginButton = new Button(SIGNIN_LABEL);
            loginButton.setIcon(VaadinIcons.SIGN_IN);

            layout.addComponents(email, loginButton);
            layout.setComponentAlignment(loginButton, Alignment.BOTTOM_RIGHT);

            panel.setContent(layout);

            vLayout.addComponent(panel);
            vLayout.setSizeFull();
            vLayout.setComponentAlignment(panel, Alignment.MIDDLE_CENTER);
            setCompositionRoot(vLayout);
        }

        /* (non-Javadoc)
         * @see com.vaadin.navigator.View#enter(com.vaadin.navigator.ViewChangeListener.ViewChangeEvent)
         */
        @Override
        public void enter(ViewChangeEvent event) {
            email.focus();
        }
    }

其余客户端类:

package com.test.project.restclient;

import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import org.glassfish.jersey.client.ClientConfig;
import org.json.simple.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.gson.Gson;
import com.test.project.model.User;


/**
 * Class contain the Rest Client which allow to use and call the rest web services.
 * 
 * @author Bob
 */
public class RestClient {

    private static final String EMAIL_LABEL = "email";
    private static final Logger LOG = LoggerFactory.getLogger(RestClient.class);

    private Client client;

    public RestClient() {
        client = ClientBuilder.newClient(new ClientConfig());
    }

    /**
     * Get the user information from the user email
     * 
     * @param email
     * @return user
     */
    @SuppressWarnings("unchecked")
    @POST
    @Path("http://IpAddress:8080/api/authentication/")
    public User getUserInfo(String email) {
        JSONObject obj = new JSONObject();
        obj.put(EMAIL_LABEL, email);

        WebTarget webtarget = client.target("http://IpAddress:8080/api/authentication/");

        Response response = webtarget.request().accept(MediaType.APPLICATION_JSON).post(Entity.entity(obj, MediaType.APPLICATION_JSON));

        String answer = response.readEntity(String.class);
        LOG.info("User information are :" + answer);
        Gson g = new Gson();
        User user = g.fromJson(answer, User.class);
        return user;
    }

}

主页 View :

package com.test.project.View;

import com.test.project.model.Action;
import com.test.project.restclient.RestClient;
import com.vaadin.data.Binder;
import com.vaadin.icons.VaadinIcons;
import com.vaadin.navigator.View;
import com.vaadin.navigator.ViewChangeListener.ViewChangeEvent;
import com.vaadin.server.VaadinSession;
import com.vaadin.ui.Button;
import com.vaadin.ui.ComboBox;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.MenuBar;
import com.vaadin.ui.TextField;
import com.vaadin.ui.VerticalLayout;


/**
 * Home page view.
 *
 * @author Bob
 */
public class HomePageView extends CustomComponent implements
        View {

    private static final long serialVersionUID = 1L;
    public static final String HOMEPAGE = "home";

    private final VerticalLayout layout;

    private static final String TOKEN_ATTRIBUTE_LABEL = "token";

    /**
     * Home page View constructor
     */
    public HomePageView() {
        layout = new VerticalLayout();
        layout.setSizeFull();
        String CURRENT_USER_TOKEN = (String) VaadinSession.getCurrent().getAttribute(TOKEN_ATTRIBUTE_LABEL);
        System.out.println("Current user token : " + CURRENT_USER_TOKEN);
        createMenu();

        setCompositionRoot(layout);
    }

    /**
     * Create a Vertical Menu with the Home page and Actions page
     */
    private void createMenu() {
        MenuBar barmenu = new MenuBar();
        barmenu.addItem("Homepage", VaadinIcons.HOME, null);
        barmenu.addItem("Actions", VaadinIcons.TABLE, null);
        layout.addComponent(barmenu);
    }


    /* (non-Javadoc)
     * @see com.vaadin.navigator.View#enter(com.vaadin.navigator.ViewChangeListener.ViewChangeEvent)
     */
    @Override
    public void enter(ViewChangeEvent event) {

    }

}

Answer 1

好的，我找到了问题的解决方案/解决方法:

• 对于第一个问题:“token”似乎是一个保留字，“tokenEmployee”似乎更好并且工作完美......

• 对于第二个问题:我仍然不知道为什么它在 Eclipse 中不起作用，我有源代码，但在 Debug模式下，我看不到它们。我换成了IntelliJ。我找不到任何有关 Vaadin session 保留字的信息。如果有人找到链接或其他东西，我非常感兴趣!

花太多时间尝试修复它..

非常感谢@jay，他试图帮助我!