Save session
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=UTF-8");
req.getSession().setAttribute("name","tinumb");
//设置失效
session.invalidate();
Get session
req.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=UTF-8");
Object name = req.getSession().getAttribute("name");
PrintWriter writer = resp.getWriter();
writer.println(name+"");
Set expiration time
<session-config>
<!-- 15分钟后失效-->
<session-timeout>15</session-timeout>
</session-config>