如何在grails应用程序中从sessionId获取HttpSession

问题描述

我有grails应用程序，使用sessionRegistry我可以获得sessionId。

I have grails application, using sessionRegistry I can get sessionId.

现在，我该如何从sessionId中获取HttpSession。

Now, how can I get HttpSession from that sessionId.

推荐答案

如果你想要 HttpSession 那么这个如何：

If you want the HttpSession then how about this:

import org.springframework.beans.BeansException
import org.springframework.context.ApplicationContext
import org.springframework.context.ApplicationContextAware
import org.springframework.stereotype.Component
import org.springframework.web.context.WebApplicationContext

import javax.servlet.http.HttpSession
import javax.servlet.http.HttpSessionEvent
import javax.servlet.http.HttpSessionListener
import java.util.concurrent.ConcurrentHashMap
import java.util.concurrent.ConcurrentMap

@Component
class SessionTracker implements HttpSessionListener, ApplicationContextAware {

    private static final ConcurrentMap<String, HttpSession> sessions = new ConcurrentHashMap<String, HttpSession>();

    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        def servletContext = ((WebApplicationContext) applicationContext).getServletContext()
        servletContext.addListener(this);
    }

    void sessionCreated(HttpSessionEvent httpSessionEvent) {
        sessions.putAt(httpSessionEvent.session.id, httpSessionEvent.session)
    }

    void sessionDestroyed(HttpSessionEvent httpSessionEvent) {
        sessions.remove(httpSessionEvent.session.id)
    }

    HttpSession getSessionById(id) {
        sessions.get(id)
    }
}

一旦你把它放到src / groovy中它应该可以在你的Spring上下文中自动使用。您可以在注入控制器或服务后像这样使用它。

Once you drop this into src/groovy it should be automatically available in your Spring context. You can use it like this after injecting into a controller or service.

sessionTracker.getSessionById('sessionId')

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