回答

可以通过HttpServletRequest与HttpServletResponse来设置session，代码如下：

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.net.http.HttpResponse;

@Controller
public class HelloController {
    @RequestMapping("/hello")
    @ResponseBody
    public String index(HttpServletRequest req, HttpServletResponse rep) {
        String id = req.getSession().getId();//jsessionid存储到浏览器的COOKIE名字
        String islogined= (String) req.getSession().getAttribute("bfw");

        if(islogined==null){
            req.getSession().setAttribute("bfw","dd");
            return "guest "+id;
        }else{
            return "logined "+id;
        }

    }

}