JWT实现单点登录

一写jwt的配置类

public class JwtUtils {
    //定义两个常量
    public static final long EXPIRE = 1000 * 60 * 60 * 24; //设置token过期时间
    public static final String APP_SECRET = "ukc8BDbRigUDaY6pZFfWus2jZWLPHO"; //密钥，随便写，做加密操作
    //生成token字符串的方法
    public static String getJwtToken(String id, String nickname){

        String JwtToken = Jwts.builder()
                //设置头信息，固定
                .setHeaderParam("typ", "JWT")
                .setHeaderParam("alg", "HS256")
                //设置过期时间
                .setSubject("guli-user")//名字随便取
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis() + EXPIRE))
                //设置token主体部分
                .claim("id", id)
                .claim("nickname", nickname)
                //根据密钥生成字符串
                .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<Claims> claimsJws = Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
        Claims claims = claimsJws.getBody();
        return (String)claims.get("id");
    }
}

二业务层编写

import com.atguigu.commonutils.JwtUtils;
import com.atguigu.commonutils.MD5;
import com.atguigu.eduservice.entity.UcenterMember;
import com.atguigu.eduservice.entity.vo.RegisterVo;
import com.atguigu.eduservice.mapper.UcenterMemberMapper;
import com.atguigu.eduservice.service.UcenterMemberService;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;

/**
 * <p>
 * 会员表 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2020-06-05
 */
@Service
public class UcenterMemberServiceImpl extends ServiceImpl<UcenterMemberMapper, UcenterMember> implements UcenterMemberService {
    //注入
    @Autowired
    private RedisTemplate<String,String> redisTemplate;
    //登录的方法
    @Override
    public String login(UcenterMember member) {

        String mobile = member.getMobile();
        String password = member.getPassword();
        //判断两者是否为空
        if (StringUtils.isEmpty(mobile) || StringUtils.isEmpty(password)){
            throw new GuliException(20001,"登录失败");
        }
        //判断手机号是否正确
        QueryWrapper<UcenterMember> wrapper = new QueryWrapper<>();
        wrapper.eq("mobile",mobile);
        UcenterMember mobilMenber = baseMapper.selectOne(wrapper);
        //判断查出来的对象是否为空
        if (mobilMenber == null){//没有这个手机号
            throw new GuliException(20001,"登录失败手机号不存在");
        }
        //判断对应手机号的密码是否正确
        //因为存储在数据库中的密码进行了加密， 解决办法：把输入的密码进行加密，在和数据库中的密码比较
        //加密方式MD5
        if (!MD5.encrypt(password).equals(mobilMenber.getPassword())){
            throw new GuliException(20001,"密码错误");
        }
        //判断用户是否禁用
        if (mobilMenber.getIsDisabled()){
            throw new GuliException(20001,"用户名已被禁用");
        }
        //登录成功
        //生成token字符串，使用JWT做到,传查出来的对象mobilMenber
        String jwtToken = JwtUtils.getJwtToken(mobilMenber.getId(), mobilMenber.getNickname());
        return jwtToken;
    }




    //注册
    @Override
    public void register(RegisterVo registerVo) {
        //获取注册的数据
        String code = registerVo.getCode();//验证码
        String mobile = registerVo.getMobile();//手机号
        String nickname = registerVo.getNickname();//昵称
        String password = registerVo.getPassword();//密码

        //非空判断
        if (StringUtils.isEmpty(code) || StringUtils.isEmpty(mobile) || StringUtils.isEmpty(nickname) || StringUtils.isEmpty(password)){
            throw new GuliException(20001,"注册失败");
        }

        //判断验证码是否正确，跟redis中验证吗是否一样
        String rediscode = redisTemplate.opsForValue().get(mobile);
        if (!code.equals(rediscode)){
            throw new GuliException(20001,"注册失败");
        }
        //判断手机号是否重复
        QueryWrapper<UcenterMember> wrapper = new QueryWrapper<>();
        wrapper.eq("mobile",mobile);
        Integer integer = baseMapper.selectCount(wrapper);
        if (integer > 0){
            throw new GuliException(20001,"注册失败");
        }

        //数据添加到数据库中
        UcenterMember member = new UcenterMember();
        member.setMobile(mobile);
        member.setPassword(MD5.encrypt(password));
        member.setNickname(nickname);
        member.setIsDisabled(false);
        member.setAvatar("http://thirdwx.qlogo.cn/mmopen/vi_32/DYAIOgq83eoj0hHXhgJNOTSOFsS4uZs8x1ConecaVOB8eIl115xmJZcT4oCicvia7wMEufibKtTLqiaJeanU2Lpg3w/132");
        baseMapper.insert(member);
    }

    @Override
    public UcenterMember getOpenIdMember(String openid) {
        QueryWrapper<UcenterMember> wrapper = new QueryWrapper<>();
        wrapper.eq("openid",openid);
        UcenterMember member = baseMapper.selectOne(wrapper);
        return member;
    }
}
三controller层

package com.atguigu.eduservice.controller;


import com.atguigu.commonutils.JwtUtils;
import com.atguigu.commonutils.R;
import com.atguigu.eduservice.entity.UcenterMember;
import com.atguigu.eduservice.entity.vo.RegisterVo;
import com.atguigu.eduservice.service.UcenterMemberService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;

/**
 * <p>
 * 会员表 前端控制器
 * </p>
 *
 * @author testjava
 * @since 2020-06-05
 */
@RestController
@RequestMapping("/educenter/member")
@CrossOrigin
public class UcenterMemberController {
    @Autowired
    private UcenterMemberService memberService;

    //登录
    @PostMapping("login")
    public R loginUser(@RequestBody UcenterMember member) {
        //member对象封装手机号和密码
        //调用service方法实现登录
        //返回token值，使用jwt生成
        String token = memberService.login(member);
        return R.ok().data("token",token);
    }

    //注册
    @PostMapping("register")
    public R registerUser(@RequestBody RegisterVo registerVo) {
        memberService.register(registerVo);
        return R.ok();
    }

    //根据token获取用户信息
    @GetMapping("getMemberInfo")
    public R getMemberInfo(HttpServletRequest request) {
        //调用jwt工具类的方法。根据request对象获取头信息，返回用户id
        String memberId = JwtUtils.getMemberIdByJwtToken(request);
        //查询数据库根据用户id获取用户信息
        UcenterMember member = memberService.getById(memberId);
        return R.ok().data("userInfo",member);
    }
}

四前端调用方法获得token