Grails通过sessionId获取session对象

Grails 通过 sessionId 获取 session 对象
思路：自定义一个类用来监听 session，所有 session 存入 map 中，sessionId 作为读取的 key

创建监听类 SessionTracker

package com.session

import org.springframework.beans.BeansException
import org.springframework.context.ApplicationContext
import org.springframework.context.ApplicationContextAware
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

class SessionTracker implements HttpSessionListener, ApplicationContextAware {

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

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)
}
}
在 grails-app/conf/resoures.groovy 中注册
import com.session.SessionTracker

// Place your Spring DSL code here
beans = {

// 自定义 session 监听器
sessionTracker(SessionTracker)
}
获取 session

package com.genee

import org.springframework.web.context.request.RequestContextHolder

import javax.servlet.http.HttpSession

class HiController {

// 注入监听对象
def sessionTracker

def index() {

// 获取 session
def sessionId = RequestContextHolder.currentRequestAttributes().getSessionId()

println “ 原 sessionId:$sessionId”

// 根据 sessionId 获取 session 对象
HttpSession httpSession = sessionTracker.getSessionById(sessionId).getId()
println “ 获取到 session 后:”+httpSession.getId()

// 使 session 立即失效
sessionTracker.getSessionById(sessionId).invalidate()
render sessionId
}
}