4

如何访问 Jetty 9 中带注释的 @WebSocket 类中的 HttpSession 对象?

我找到了如何使用 @ServerEndpoint 注释来做到这一点,就像这里:来自 @ServerEndpoint 的 HttpSession

使用@WebSocket 注释,就像在下面的类中一样,我该怎么做?

@WebSocket
public class AuctionWebSocket {

    // NEED TO ACCESS HttpSession OBJECT INSIDE THESE METHODS:

    @OnWebSocketConnect
    public void onConnect(Session session) {
        System.out.println("onConnect...");        
    }

    @OnWebSocketMessage
    public void onMessage(String message) {        
        System.out.println("Message: " + message);
    }    

    @OnWebSocketClose
    public void onClose(int statusCode, String reason) {
        System.out.println("onClose...");        
    }

    @OnWebSocketError
    public void onError(Throwable t) {
        System.out.println("onError...");        
    }    
}

在方法内部onConnect(Session session),我尝试调用session.getUpgradeRequest().getSession()which 总是返回null

为方便起见,以下是我启动嵌入式 Jetty 9 的方式:

public class Main {

    public static void main(String[] args) throws Exception {

        String webPort = System.getenv("PORT");
        if (webPort == null || webPort.isEmpty()) {
            webPort = "8080";
        }

        Server server = new Server(Integer.parseInt(webPort));

        ClassList classlist = org.eclipse.jetty.webapp.Configuration.ClassList.setServerDefault(server);
        classlist.addBefore("org.eclipse.jetty.webapp.JettyWebXmlConfiguration",
                "org.eclipse.jetty.annotations.AnnotationConfiguration");

        WebAppContext wac = new WebAppContext();
        String webappDirLocation = "./src/main/webapp/";

        wac.setAttribute("org.eclipse.jetty.server.webapp.ContainerIncludeJarPattern", ".*/classes/.*");
        wac.setDescriptor(webappDirLocation + "/WEB-INF/web.xml");
        wac.setBaseResource(new ResourceCollection(new String[]{webappDirLocation, "./target"}));
        wac.setResourceAlias("/WEB-INF/classes/", "/classes/");
        wac.setContextPath("/");
        wac.setParentLoaderPriority(true);

        /*
         * WebSocket handler.
         */
        WebSocketHandler wsh = new WebSocketHandler() {

            @Override
            public void configure(WebSocketServletFactory wssf) {
                wssf.register(AuctionWebSocket.class);
            }
        };

        ContextHandler wsc = new ContextHandler();
        wsc.setContextPath("/auction-notifications");
        wsc.setHandler(wsh);

        ContextHandlerCollection chc = new ContextHandlerCollection();
        chc.setHandlers(new Handler[]{wac, wsc});

        server.setHandler(chc);

        server.start();
        server.join();
    }

}

如果您需要更多信息,请与我们联系。

任何帮助将不胜感激。

提前致谢。

4

1 回答 1

5

您将需要使用 WebSocketCreator 概念。

首先,您在您的配置中设置WebSocketCreator您的选择WebSocketServletFactoryWebSocketServlet

public class MySessionSocketServlet extends WebSocketServlet
{
    @Override
    public void configure(WebSocketServletFactory factory)
    {
        factory.getPolicy().setIdleTimeout(30000);
        factory.setCreator(new MySessionSocketCreator());
    }
}

接下来,您需要HttpSession在升级期间获取 并将其传递给您正在创建的 WebSocket 对象。

public class MySessionSocketCreator implements WebSocketCreator
{
    @Override
    public Object createWebSocket(ServletUpgradeRequest req, ServletUpgradeResponse resp)
    {
        HttpSession httpSession = req.getSession();
        return new MySessionSocket(httpSession);
    }
}

最后,只需HttpSession在您自己的WebSocket.

@WebSocket
public class MySessionSocket
{
    private HttpSession httpSession;
    private Session wsSession;

    public MySessionSocket(HttpSession httpSession)
    {
        this.httpSession = httpSession;
    }

    @OnWebSocketConnect
    public void onOpen(Session wsSession)
    {
        this.wsSession = wsSession;
    }
}

注意:HttpSession当 WebSocket 处于活动状态时,它可以过期并被清除和清理。此外,HttpSession不能保证此时的内容与其他 Web 操作的更改保持同步(这主要取决于您在服务器端使用的 Session 存储/缓存技术)

还有一点要注意:抵制ServletUpgradeRequest在您的 Socket 实例中存储/跟踪对象的冲动,因为该对象被 Jetty 适当地回收和清理。

于 2014-12-29T19:31:20.320 回答