如何在Jetty 9中的带注释的@WebSocket类中访问HttpSession对象?
我找到了如何使用@ServerEndpoint注释来完成它,就像这里:HttpSession from @ServerEndpoint
使用@WebSocket注释,就像下面的课程一样,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onConnect(Session session)
内,我尝试拨打session.getUpgradeRequest().getSession()
,并始终返回null
。
为了便于获取信息,以下是我启动嵌入式Jetty 9的方法:
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。
答案 0 :(得分:4)
您想要使用WebSocketCreator概念。
首先,您在WebSocketCreator
WebSocketServletFactory
中设置所选的WebSocketServlet
public class MySessionSocketServlet extends WebSocketServlet
{
@Override
public void configure(WebSocketServletFactory factory)
{
factory.getPolicy().setIdleTimeout(30000);
factory.setCreator(new MySessionSocketCreator());
}
}
接下来,您希望在升级过程中抓取HttpSession
并将其传递到您正在创建的WebSocket对象中。
public class MySessionSocketCreator implements WebSocketCreator
{
@Override
public Object createWebSocket(ServletUpgradeRequest req, ServletUpgradeResponse resp)
{
HttpSession httpSession = req.getSession();
return new MySessionSocket(httpSession);
}
}
最后,只需跟踪自己HttpSession
中的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;
}
}
值得注意的是:HttpSession
可以在WebSocket处于活动状态时过期并进行清理和清理。此外,此时的HttpSession
内容无法保证与其他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会话存储/缓存技术)
还有一点需要注意:抵制在Socket实例中存储/跟踪ServletUpgradeRequest
对象的冲动,因为Jetty本身可以回收并清理这个对象。