Jetty http会话始终为空(Embedded Container，ServletHolder) [英] Jetty http session is always null (Embedded Container, ServletHolder)

问题描述

我正在尝试实现一个简单的servlet，该servlet在其中使用HTTP会话. 嵌入式码头(7.3.0 v20110203)容器.要开始码头，我使用以下代码:

I am trying to implement a simple servlet which uses a HTTP session in an embedded jetty (7.3.0 v20110203) container. To start jetty I use the following code:

Server server = new Server(12043);
ServletContextHandler handler = new
            ServletContextHandler(ServletContextHandler.SESSIONS);
handler.setContextPath("/");
server.setHandler(handler);
ServletHolder holder = new ServletHolder(new BaseServlet());
handler.addServlet(holder, "/*");
server.start();
server.join();

该servlet通过

HttpSession session = request.getSession(true);

并在其中存储一些数据.在下一个请求时，它将获得会话 使用以下代码:

and stores some data in it. Upon the next request it gets the session with the following code:

HttpSession session = request.getSession(false);

，该会话始终为空.

我没有找到任何有关的信息 互联网上有关此特定问题的信息.我也尝试过 与设置SessionManager或SessionIdManager，但似乎没有 改变任何东西.我怀疑我在这里缺少有关SessionManager或SessionIdManager或SessionHandler的信息，但这只是一个疯狂的猜测.

I did not find any information on the internet about this particular problem. I have also experimented with setting a SessionManager or SessionIdManager, but that did not seem to change anything. I suspect I am missing something about SessionManager or SessionIdManager or SessionHandler here, but this is just a wild guess.

推荐答案

您的代码在此基本的BaseServlet实现中可以正常工作:

Your code works fine with this skeletal implementation of BaseServlet:

public class BaseServlet extends HttpServlet {
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
        boolean create = "true".equals(req.getParameter("create"));

        HttpSession session = req.getSession(create);
        if (create) {
            session.setAttribute("created", new Date());
        }

        PrintWriter pw = new PrintWriter(resp.getOutputStream());
        pw.println("Create = " + create);
        if (session == null) {
            pw.println("no session");
        } else {
            pw.println("Session = " + session.getId());
            pw.println("Created = " + session.getAttribute("created"));
        }

        pw.flush();
    }

因此该会话可能在代码中的其他地方失效了.

so the session is probably being invalidated somewhere else in your code.

还可以使用ServletContextHandler的setSessionHandler()方法显式设置SessionHandler.

The SessionHandler can also be explicity set using the setSessionHandler() method of ServletContextHandler.

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