@RequestMapping("/login")
    //java项目 www.fhadmin.cn
    public String login(HttpServletRequest request, @RequestParam("userName") String userName, @RequestParam("passWord") String passWord) {
        String res = userService.check_userName(userName);
        if (!res.equals("registed")) {
            return "userName has not registed";
        }    
        String str = userService.check_userName_and_passWord(userName, passWord);
        if (str.equals("success")){
            //第一步：获取session
            HttpSession session = request.getSession();
            //第二步：将想要保存到数据存入session中
            session.setAttribute("userName",userName);
            session.setAttribute("password",passWord);
            //这样就完成了用户名和密码保存到session的操作
        }
        return str;
    }

@RequestMapping("/index")
//java项目 www.fhadmin.cn
public class IndexController {

    @Autowired
    HttpServletRequest request; //通过注解获取一个request
    
    @RequestMapping("/getName")
    public String getName() {
        //通过request来获取保存在session中的用户名
        String userName = (String) request.getSession().getAttribute("userName");
        System.out.println(userName);
        return userName;
    }
}