【spring-boot】spring-boot项目中，通过thymleaf实现登录功能，这里是一个登录拦截器的参考代码

我们在实现网页登录操作时，需要对网页进行保护（权限控制），将没有没有登录到请求拦截在系统之外，那么这里可以通过一个拦截器实现该功能

以下是LoginHanderInterceptor.java的参考代码：

package com.springboot.conponent;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author zhuhonggen
 * @version 创建时间：2019/08/06 21:57
 * @ClassName 类名称
 * @Description 类描述
 */

public class LoginHanderInterceptor 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("msg","您没有权限！");
            request.getRequestDispatcher("/login.html").forward(request,response);
            return false;
        }else{
            return false;
        }

    }

    @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 {

    }
}