• 首先，我们一般在登录时将用户名或id存入session
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpSession;

@Controller
public class LoginController {

    @PostMapping("/login")
    public String login(@RequestParam("userName") String userName,
                        @RequestParam("password") String password,
                        Model model, HttpSession session){
        if(!StringUtils.isEmpty(userName)&&password.equals("1")){
            session.setAttribute("loginUser",userName);
            return "hello";
        }else {
            model.addAttribute("message","登录失败");
            return "login";
        }
    }
}

  • 接下来，配置session拦截器

    • webconfig配置
        //注册拦截器
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new TokenInterceptor()).addPathPatterns("/**")
                .excludePathPatterns("/","index.html","/login");
    }
    • SessionInterceptor.java
public class SessionInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object user=request.getSession().getAttribute("loginUser");
        if(user==null){
            request.setAttribute("message","没有权限，请先登录");
            request.getRequestDispatcher("/").forward(request,response);
            return false;
        }else {
            return true;
        }
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
  • 在html里使用session里的数据
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
    <head>
        <meta charset="UTF-8">
        <title>Hello</title>
    </head>
    <body>
        <p>[[${session.loginUser}]]</p>
        <p th:text="${session.loginUser}"></p>
    </body>
</html>

hhhhh