当客户端关闭后，服务器不关闭，两次获取Session是否为同一个
默认情况下，不是
如果相同，则可以创建Cookie，键为JESSIONID，设置最大存活时间，让cookie持久化保存
Cookie cookie = new Cookie("JSESSIONID",session.getId());
cookie.setMaxAge(60*60);
response.addCookie(cookie);
@WebServlet("/SessionDemo3")
public class SessionDemo3 extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
System.out.println(session);
Cookie cookie = new Cookie("JSESSIONID",session.getId());
cookie.setMaxAge(60*60);
response.addCookie(cookie);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
会话技术_session_细节2
客户端不关闭，服务器关闭后，两次获取的Session是同一个吗？
不是同一个，但是要确保数据不丢失
Session的钝化
在服务器正常关闭之前，将session对象系列化到硬盘上
Session的活化
在服务器启动后，将session文件转化为内存中的session对象即可。
@WebServlet("/SessionDemo3")
public class SessionDemo3 extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
HttpSession session = request.getSession();
System.out.println(session);
Cookie cookie = new Cookie("JSESSIONID",session.getId());
cookie.setMaxAge(60*60);
response.addCookie(cookie);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
