action里设置session

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UserDao userDao = new
UserDao();

User  u = userDao.login(user); <span style="color: rgb(0, 128, 0);">// 调用登录方法。</span>

result = new
HashMap();

if(u != null){

    result.put("result", true);

    ServletActionContext.getRequest().getSession().setAttribute("user",u);

}else{

    result.put("result", false);

}

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User user = (User)session.getAttribute("user");

if(user == null){

     response.sendRedirect("login.jsp");

}<span style="color: rgb(153, 51, 0);"><br></span>