springboot项目中拦截器实现，只能通过登录进入，直接进入会被拦截

将登录的session保存！！！

1.实现一个拦截器类

package com.demo1.springboot.config;

/**
 * @author panglili
 * @create 2022-07-09-10:33
 */

import org.springframework.web.servlet.HandlerInterceptor;

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

/**
 * 拦截器实现
 */
public class LoginHandlerInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //登陆成功之后拿到session；证明登录成功！
        Object loginUser = request.getSession().getAttribute("loginUser");
        if(loginUser==null){
            //没有登录
            request.setAttribute("msg","没有权限，请先登录！");
            request.getRequestDispatcher("/index.html").forward(request,response);
        return false;
        }else{
            return true;
        }

    }
}

 

2.注册拦截器类到mvc

@Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new LoginHandlerInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/index.html","/","/user/login","/css/*","/js/**","/img/**");
    }

 

ok了就
测试：