单点登录

1、在common_utils模块中添加jwt工具依赖

<dependencies>
    
    <dependency>
        <groupId>io.jsonwebtokengroupId>
        <artifactId>jjwtartifactId>
   dependency>
dependencies>

2、创建JWT工具类

package com.wang.commonutils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jws;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.Date;

public class JwtUtils {

    public static final long EXPIRE = 1000 * 60 * 60 * 24;
    public static final String APP_SECRET = "ukc8BDbRigUDaY6pZFfWus2jZWLPHO";

    public static String getJwtToken(String id, String nickname){

        String JwtToken = Jwts.builder()
                .setHeaderParam("typ", "JWT")
                .setHeaderParam("alg", "HS256")
                .setSubject("guli-user")
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis() + EXPIRE))
                .claim("id", id)
                .claim("nickname", nickname)
                .signWith(SignatureAlgorithm.HS256, APP_SECRET)
                .compact();

        return JwtToken;
    }

    /**
     * 判断token是否存在与有效
     * @param jwtToken
     * @return
     */
    public static boolean checkToken(String jwtToken) {
        if(StringUtils.isEmpty(jwtToken)) return false;
        try {
            Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * 判断token是否存在与有效
     * @param request
     * @return
     */
    public static boolean checkToken(HttpServletRequest request) {
        try {
            String jwtToken = request.getHeader("token");
            if(StringUtils.isEmpty(jwtToken)) return false;
            Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * 根据token获取会员id
     * @param request
     * @return
     */
    public static String getMemberIdByJwtToken(HttpServletRequest request) {
        String jwtToken = request.getHeader("token");
        if(StringUtils.isEmpty(jwtToken)) return "";
        Jws claimsJws = Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
        Claims claims = claimsJws.getBody();
        return (String)claims.get("id");
    }
}

3.用户登录时生成token返回给前端

public String login(UcenterMember member) {

        String mobile = member.getMobile();
        String password = member.getPassword();

        if (StringUtils.isEmpty(mobile)||StringUtils.isEmpty(password))
        {
            throw new WangException(20001,"登录失败！");
        }

        QueryWrapper wrapper=new QueryWrapper<>();
        wrapper.eq("mobile",mobile);
        UcenterMember mobileMember = baseMapper.selectOne(wrapper);
        if (mobileMember==null)
        {

            throw new WangException(20001,"登录失败！");

        }

        if (!MD5.encrypt(password).equals(mobileMember.getPassword()))
        {
            throw new WangException(20001,"登录失败！");
        }
        if (mobileMember.getIsDisabled())
        {
            throw new WangException(20001,"登录失败！");
        }
        String token = JwtUtils.getJwtToken(mobileMember.getId(), mobileMember.getNickname());

        return token;



    }

5.前端拿到token将token设置进request的header里

6.controller接口从前端请求中根据token获取用户信息

@GetMapping("getMemberInfo")
    public R getMemberInfo(HttpServletRequest request){


        String memberId = JwtUtils.getMemberIdByJwtToken(request);
        UcenterMember userInfo = ucenterMemberService.getById(memberId);



        return R.ok().data("userInfo",userInfo);

    }