springBoot和vue实现登录操作和JWT验证

前言

大家好 我是歌谣 今天继续进行前后端的一个学习 目前进入的是javaweb部分 今天来聊聊登录部分和JWT验证部分的书写

用户登录loginController

package com.itheima.controller;

import com.itheima.pojo.Emp;
import com.itheima.pojo.Result;
import com.itheima.service.EmpService;
import com.itheima.utils.JwtUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

@Slf4j
@RestController
public class LoginConroller {
    @Autowired
    private EmpService empService;
    @PostMapping("/login")
    public Result login(@RequestBody Emp emp)
    {log.info("员工登录:{}");
        log.info("登录");
        Emp e=empService.login(emp);
        //登录成功
        if(e!=null){
            Map<String, Object> claims=new HashMap<>();
            claims.put("id",e.getId());
            claims.put("name",e.getName());
            claims.put("username",e.getUsername());
           String jwt= JwtUtils.generateJwt(claims);
           return Result.success(jwt);
        }
        return e!=null?Result.success():Result.error("用户名和密码错误");
    }
}

EmpService

package com.itheima.service;
import com.itheima.pojo.Emp;
import com.itheima.pojo.PageBean;
import org.springframework.stereotype.Service;
import java.time.LocalDate;
import java.util.List;
public interface EmpService {
    PageBean page(Integer page, Integer pageSize, String name, Short gender, LocalDate begin,LocalDate end);
    void delete(List<Integer> ids);
    void save(Emp emp);
    Emp getById(Integer id);
    void update(Emp emp);
    Emp login(Emp emp);
}

EmpServiceImpl实现类

package com.itheima.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.autoconfigure.PageHelperAutoConfiguration;
import com.itheima.mapper.EmpMapper;
import com.itheima.pojo.Emp;
import com.itheima.pojo.PageBean;
import com.itheima.service.EmpService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.util.List;

//@Service
//public class EmpServiceImpl implements EmpService {
//    @Autowired
//    private EmpMapper empMapper;
//    @Override
//    public PageBean page(Integer page, Integer pageSize) {
//        Long count= empMapper.count();
//        Integer start=(page-1)*pageSize;
//        empMapper.page(start,pageSize);
//        List<Emp> empList=empMapper.page(start,pageSize);
//        PageBean pageBean=new PageBean(count,empList);
//        return pageBean;
//    }
//}
@Service
public class EmpServiceImpl implements EmpService {
    @Autowired
    private EmpMapper empMapper;

    @Override
    public PageBean page(Integer page, Integer pageSize, String name, Short gender, LocalDate begin, LocalDate end) {
        PageHelper.startPage(page,pageSize);
        List<Emp> empList = empMapper.list(name,gender,begin,end);
        Page<Emp> p= (Page<Emp>) empList;

        PageBean pageBean=new PageBean(p.getTotal(),p.getResult());
        return pageBean;
    }
    @Override
    public void delete(List<Integer> ids){
        empMapper.delete(ids);
    }

    @Override
    public void save(Emp emp) {
        emp.setCreateTime(LocalDateTime.now());
        emp.setUpdateTime(LocalDateTime.now());
        empMapper.insert(emp);
    }

    @Override
    public Emp getById(Integer id) {
        return empMapper.getById(id);
    }

    @Override
    public void update(Emp emp) {
        emp.setUpdateTime(LocalDateTime.now());
        empMapper.update(emp);
    }

    @Override
    public Emp login(Emp emp) {
        return empMapper.getByUsernameAndPassword(emp);
    }
}

EmpMapper

package com.itheima.mapper;

import com.itheima.pojo.Emp;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

import java.time.LocalDate;
import java.util.List;

/**
 * 员工管理
 */
//@Mapper
//public interface EmpMapper {
//    @Select("select count(*) from emp")
//    public Long count();
//@Select("select * from emp limit #{start},#{pageSize}")
//    public List<Emp> page(Integer start, Integer pageSize);

//}
@Mapper
public interface EmpMapper {

   // @Select("select * from emp")
    public List<Emp> list(String name, Short gender, LocalDate begin, LocalDate end);

    void delete(List<Integer> ids);
@Insert("insert into emp(username,name,gender,image,job,entrydate,dept_id,create_time,update_time)"+
"values(#{username},#{name},#{gender},#{image},#{job},#{entrydate},#{deptId},#{createTime},#{updateTime})")

    void insert(Emp emp);
    @Select("select * from emp where id=#{id}")
    Emp getById(Integer id);

    void update(Emp emp);
    @Select("select * from emp where username=#{username} and password=#{password}"
            )
    Emp getByUsernameAndPassword(Emp emp);
@Delete("delete from emp where dept_id=#{deptId}")
    void deleteByDeptId(Integer deptId);


}

JWTutils工具类

package com.itheima.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import java.util.Date;
import java.util.Map;

public class JwtUtils {
    private static String signKey="itheima";
    private static long expire=0L;

    public static String generateJwt(Map<String,Object> claims){


        String jwt= Jwts.builder().addClaims(claims).signWith(SignatureAlgorithm.HS256,signKey)
                .setExpiration(new Date(System.currentTimeMillis()+expire)).compact();
        return jwt;
    }
    public  static Claims parseJWT(String jwt){
        Claims claims=Jwts.parser().setSigningKey(signKey).parseClaimsJwt(jwt).getBody();
        return claims;
    }
}

拦截器

package com.itheima.interceptor;

import com.alibaba.fastjson.JSONObject;
import com.itheima.utils.JwtUtils;
import com.itheima.pojo.Result;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;


@Component
@Slf4j
public class LoginCheckInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest req, HttpServletResponse resp, Object handler) throws Exception {
        System.out.println("preHandle");


        String url=req.getRequestURL().toString();
    log.info("请求url",url);
       if(url.contains("login")){
           return true;
       }
        String jwt=req.getHeader("token");
        log.info("jwt",jwt);
       try {
           JwtUtils.parseJWT(jwt);

       }catch (Exception e){
           if(!StringUtils.hasLength(jwt)){
               Result error=Result.error("NOT_LOGIN");
               String notLogin= JSONObject.toJSONString(error);
               resp.getWriter().write(notLogin);
               return false;
           }
       }


       log.info("放行");
       return true;

    }

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

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion");
    }
}

配置webconfig

package com.itheima.config;

import com.itheima.interceptor.LoginCheckInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class webConfig implements WebMvcConfigurer {
    @Autowired
    private LoginCheckInterceptor loginCheckInterceptor;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(loginCheckInterceptor).addPathPatterns("/**").
                excludePathPatterns("/login");
    }
}

运行结果

直接访问会弹出页面（token过期）