登录入口处理完之后,考虑到回话结束的话,那么对应的登录用户也应该相应的注销登录。我们可以写一个Session监听器,监听sessioon销毁的时候,我们将登录的用户注销掉,也就是从application中移除。表示该用户已经下线了。
代码如下:
public class SessionListener implements HttpSessionListener,ServletContextListener{
private int count;
private ServletContext servletContext = null;
public SessionListener() {
count = 0;
}
private Logger logger = Logger.getLogger(this.getClass());
@Override
public void sessionCreated(HttpSessionEvent event) {
count++;
setContext(event);
logger.info("***************the http session is created...***************");
}
@Override
public void sessionDestroyed(HttpSessionEvent event) {
//在session销毁的时候 把loginUserMap中保存的键值对清除
User user = (User)event.getSession().getAttribute("loginUser");
if(user!=null){
Map
loginUserMap.remove(user.getFuUserName());
event.getSession().getServletContext().setAttribute("loginUserMap",loginUserMap);
}
count--;
setContext(event);
logger.info("***************the http session is destroyed...***************");
}
public void setContext(HttpSessionEvent httpSessionEvent){
httpSessionEvent.getSession().getServletContext().setAttribute("online", count);
}
@Override
public void contextDestroyed(ServletContextEvent servletcontextevent) {
this.servletContext = null;
logger.info("***************the servlet context is destroyed...***************");
}
@Override
public void contextInitialized(ServletContextEvent servletcontextevent) {
this.servletContext = servletcontextevent.getServletContext();
logger.info("***************the servlet context is initialized...***************");
}
public class SessionListener implements HttpSessionListener,ServletContextListener{
private int count;
private ServletContext servletContext = null;
public SessionListener() {
count = 0;
}
private Logger logger = Logger.getLogger(this.getClass());
@Override
public void sessionCreated(HttpSessionEvent event) {
count++;
setContext(event);
logger.info("***************the http session is created...***************");
}
@Override
public void sessionDestroyed(HttpSessionEvent event) {
//在session销毁的时候 把loginUserMap中保存的键值对清除
User user = (User)event.getSession().getAttribute("loginUser");
if(user!=null){
Map
loginUserMap.remove(user.getFuUserName());
event.getSession().getServletContext().setAttribute("loginUserMap",loginUserMap);
}
count--;
setContext(event);
logger.info("***************the http session is destroyed...***************");
}
public void setContext(HttpSessionEvent httpSessionEvent){
httpSessionEvent.getSession().getServletContext().setAttribute("online", count);
}
@Override
public void contextDestroyed(ServletContextEvent servletcontextevent) {
this.servletContext = null;
logger.info("***************the servlet context is destroyed...***************");
}
@Override
public void contextInitialized(ServletContextEvent servletcontextevent) {
this.servletContext = servletcontextevent.getServletContext();
logger.info("***************the servlet context is initialized...***************");
}
web.xml中配置如下:
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