spring boot 读写参数到session

    @RequestMapping("/login")
    //java  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  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;
    }
}