How SpringBoot implements login interceptor

Create two packages in the project directory: inter and contsfig

Implement the inheritance class of HandlerInterceptor in the new layer of inter

package com.example.gameboxadminserver.inter;

import com.example.gameboxadminserver.entity.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

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

public class MyInterceptor implements HandlerInterceptor {
	//在preHandle方法中进行登录判断
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession();
        //session.setAttribute("adminName","o");

        String adminName = (String)session.getAttribute("adminName");//获取储存的session
       //System.out.println(adminName);
        if(adminName==null){
            System.out.println("请先登陆！");
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        //System.out.println("执行了TestInterceptor的postHandle方法");
    }


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

    }
}

Add the inherited class LoginConfig of WebMvcConfiguer in conrsfig

Implement the addInterceptors method

package com.example.gameboxadminserver.contsfig;


import com.example.gameboxadminserver.inter.MyInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class LoginConfig implements WebMvcConfigurer {

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //注册拦截器
        InterceptorRegistration registration = registry.addInterceptor(new MyInterceptor());
        registration.addPathPatterns("/**");                      //所有路径都被拦截
        registration.excludePathPatterns(
                //添加不拦截路径
                "/admin/adminLogin",
                
        );
    }
}

In the serviceImpl layer

Implement the login logic and save the session

Httpsession session

session.setAttribute(“name”,value);

package com.example.gameboxadminserver.service.impl;

import com.example.gameboxadminserver.entity.Admin;
import com.example.gameboxadminserver.entity.Result;
import com.example.gameboxadminserver.entity.ResultUtil;
import com.example.gameboxadminserver.mapper.AdminMapper;
import com.example.gameboxadminserver.service.AdminService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author firstGroup
 * @since 2020-10-28
 */
@Service
public class AdminServiceImpl extends ServiceImpl<AdminMapper, Admin> implements AdminService {
    @Autowired
    AdminMapper adminMapper;
    @Override
    public Result adminLogin(HttpSession session,String adminName, String adminPwd) {
        Admin admin = adminMapper.adminLogin(adminName,adminPwd);
        if(admin!=null){
            session.setAttribute("adminName",adminName);
            return ResultUtil.success("登陆成功！");
        }
        return ResultUtil.error(2000,"登陆失败");
    }
}

This is it.

Functional test

Login failed

Unable to access other interfaces

Login Success

Successful access to other interfaces

The above is the detailed content of How SpringBoot implements login interceptor. For more information, please follow other related articles on the PHP Chinese website!