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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);
}

参考:http://hi.baidu.com/timer_ysh/item/460ccef6564c99cf531c2699

然后在jsp里获取session,如果为空,重定向到登录页面:

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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>