Servlets 即使删除Servlet中的会话属性，会话属性仍然存在

我正在从LogoutServlet中的会话中删除属性。在另一个servlet（LogoutCheckServlet）中，我试图获得相同的属性，但它仍然存在。请帮我找到同样的原因

LogoutServlet

公共类LogoutServlet扩展了HttpServlet{

/**
 * 
 */
private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request, HttpServletResponse response) {

    HttpSession session= request.getSession(false);
    if(session.getAttribute("userInfo")!=null) { 
        System.out.println("In Logout");
        session.removeAttribute("userInfo");
        session.invalidate();
        System.out.println("In Logout");
    }
    try {
        response.sendRedirect("http://localhost:8080/loginpoc/JSP/Login.jsp");
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }



}

/**
 * 
 */
private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest req, HttpServletResponse resp) {
    resp.setContentType("text/xml");
    String response=null;
    UserSessionInfoBean bean=null;
    try {
        System.out.println("In Session Check");
        HttpSession session= req.getSession(false);
        /*
        if (session.isNew()){
            System.out.println("New");
            System.out.println("New Session Id:"+session.getId());
            System.out.println("New Creation Time:- "+session.getCreationTime());
        }
        else{
            System.out.println("Old");
            System.out.println("Else Session Id:"+session.getId());
            System.out.println("Else Creation Time:- "+session.getCreationTime());
        }*/
        bean=(UserSessionInfoBean)session.getAttribute("userInfo");
        System.out.println(bean.getFullName());
        if (bean.getFullName()==null){
            response = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><root>N</root>";
            System.out.println("If block");
        }   
         else{
            response = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><root>Y</root>";
            System.out.println("Else block");
         }
        resp.getWriter().println(response);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    finally{
        bean=null;
    }
}

}

注销CheckServlet

公共类SessionCheck扩展了HttpServlet{

/**
 * 
 */
private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request, HttpServletResponse response) {

    HttpSession session= request.getSession(false);
    if(session.getAttribute("userInfo")!=null) { 
        System.out.println("In Logout");
        session.removeAttribute("userInfo");
        session.invalidate();
        System.out.println("In Logout");
    }
    try {
        response.sendRedirect("http://localhost:8080/loginpoc/JSP/Login.jsp");
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }



}

/**
 * 
 */
private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest req, HttpServletResponse resp) {
    resp.setContentType("text/xml");
    String response=null;
    UserSessionInfoBean bean=null;
    try {
        System.out.println("In Session Check");
        HttpSession session= req.getSession(false);
        /*
        if (session.isNew()){
            System.out.println("New");
            System.out.println("New Session Id:"+session.getId());
            System.out.println("New Creation Time:- "+session.getCreationTime());
        }
        else{
            System.out.println("Old");
            System.out.println("Else Session Id:"+session.getId());
            System.out.println("Else Creation Time:- "+session.getCreationTime());
        }*/
        bean=(UserSessionInfoBean)session.getAttribute("userInfo");
        System.out.println(bean.getFullName());
        if (bean.getFullName()==null){
            response = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><root>N</root>";
            System.out.println("If block");
        }   
         else{
            response = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><root>Y</root>";
            System.out.println("Else block");
         }
        resp.getWriter().println(response);
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    finally{
        bean=null;
    }
}

/**
* 
*/
私有静态最终长serialVersionUID=1L；
受保护的void doPost（HttpServletRequest-req、HttpServletResponse-resp）{
分别为setContentType（“文本/xml”）；
字符串响应=null；
UserSessionInfoBean=null；
试一试{
System.out.println（“会话内检查”）；
HttpSession session=req.getSession（false）；
/*
if（session.isNew（））{
系统输出打印项次（“新”）；
System.out.println（“新会话Id:+Session.getId（））；
System.out.println（“新创建时间：-“+session.getCreationTime（））；
}
否则{
System.out.println（“旧”）；
System.out.println（“Else会话Id:+Session.getId（））；
System.out.println（“Else创建时间：-”+session.getCreationTime（））；
}*/
bean=（UserSessionInfoBean）session.getAttribute（“userInfo”）；
System.out.println（bean.getFullName（））；
if（bean.getFullName（）==null）{
答复=“N”；
系统输出打印项次（“如果块”）；
}   
否则{
答复=“Y”；
System.out.println（“Else块”）；
}
resp.getWriter（）.println（响应）；
}捕获（IOE异常）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}
最后{
bean=null；
}
}

---

}

请求的确切流程是什么？首先调用注销servlet，然后调用注销检查servlet。