SpringBoot实现JWTtoken自动续期的示例代码

 //创建token
String token = JwtUtil.createToken(sysUser.getId(), user.getUserName());
//将token放入Redis中,key为用户的手机号+"token"
redisUtil.set(sysUser.getPhone() + GlobalConstant.TOKEN, token, JwtUtil.EXPIRE_TIME*2);

private boolean refreshToken(SysUser sysUser) {
    String token = request.getHeader(GlobalConstant.TOKEN);
    String cacheToken = (String) (redisUtil.get(sysUser.getPhone() + GlobalConstant.TOKEN));
    //请求头中不存在token，返回false
    if (StringUtil.isEmpty(token)) {
        logger.error("请求头中token不存在");
        return false;
    }
    //用户是否登录只根据redis中token是否存在决定，redis中不存在token，返回false
    if (StringUtil.isEmpty(cacheToken)) {
        logger.error("用户未登录");
        return false;
    }
    try {
        //验证请求头中的token是否合法
        JwtUtil.verify(token);
    } catch (TokenExpiredException tokenExpiredException) {
        
        if (cacheToken.equals(token)) {
            //重新刷新redis中的token的过期时间
            redisUtil.set(sysUser.getPhone() + GlobalConstant.TOKEN, token, JwtUtil.EXPIRE_TIME * 2);
            return true;
        } else {
            return false;
        }
    } catch (Exception e) {
        //若抛出除token过期异常之外的其他异常，说明该token不合法
        logger.error("token不合法");
        return false;
    }
    return true;
}

@Component
public class LoginInterceptor implements HandlerInterceptor {
 
    private final Logger logger = LoggerFactory.getLogger(getClass());
    @Resource
    private SysUserDao sysUserDao;
    @Resource
    private RedisUtil redisUtil;
    @Resource
    private HttpServletRequest request;
 
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        logger.info("进入拦截器 uri:" + request.getRequestURI());
        // 不是controller的方法不拦截
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }
        //检查方法上是否有@PreAuth注解，没有则不拦截
        HandlerMethod handlerMethod = (HandlerMethod) handler;
        PreAuth preAuth = handlerMethod.getMethodAnnotation(PreAuth.class);
        if (preAuth == null) {
            return true;
        }
        Long userId = JwtUtil.getUserIdByToken(request);
        SysUser sysUser = sysUserDao.selectById(userId);
        //用户不存在，进行拦截
        if (sysUser == null) {
            logger.error("用户不存在");
            return false;
        }
        if (!refreshToken(sysUser)) {
            return false;
        }
        //判断用户是否有对应权限
        Set<String> authList = this.sysUserDao.queryAuthList(userId);
        if (!authList.contains(preAuth.value())) {
            logger.error("无权限");
            return false;
        }
        return true;
    }
 
    
    private boolean refreshToken(SysUser sysUser) {
        String token = request.getHeader(GlobalConstant.TOKEN);
        String cacheToken = (String) (redisUtil.get(sysUser.getPhone() + GlobalConstant.TOKEN));
        //请求头中不存在token，返回false
        if (StringUtil.isEmpty(token)) {
            logger.error("请求头中token不存在");
            return false;
        }
        //用户是否登录只根据redis中token是否存在决定，redis中不存在token，返回false
        if (StringUtil.isEmpty(cacheToken)) {
            logger.error("用户未登录");
            return false;
        }
        try {
            //验证请求头中的token是否合法
            JwtUtil.verify(token);
        } catch (TokenExpiredException tokenExpiredException) {
            
            if (cacheToken.equals(token)) {
                //重新刷新redis中的token的过期时间
                redisUtil.set(sysUser.getPhone() + GlobalConstant.TOKEN, token, JwtUtil.EXPIRE_TIME * 60 * 2);
                return true;
            } else {
                return false;
            }
        } catch (Exception e) {
            //若抛出除token过期异常之外的其他异常，说明该token不合法
            logger.error("token不合法");
            return false;
        }
        return true;
    }
}

import com.admin.common.constant.GlobalConstant;
import com.auth0.jwt.JWT;
import com.auth0.jwt.alGorithms.Algorithm;
 
import javax.servlet.http.HttpServletRequest;
import java.util.Calendar;
import java.util.Date;
 
public class JwtUtil {
    
    public static final String TOKEN_SECRET_KEY = "tokenSecreTKEy";
    
    public static final int EXPIRE_TIME = 60;
 
    
    public static String createToken(Long userId, String userName) {
        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.SECOND, EXPIRE_TIME);
        return JWT.create()
                //签发对象
                .withAudience(userId + "")
                //载荷
                .withClaim("userName", userName)
                //签发时间
                .withIssuedAt(new Date())
                //有效时间
                .withExpiresAt(calendar.getTime())
                //加密
                .sign(Algorithm.HMac256(TOKEN_SECRET_KEY));
    }
 
    
    public static void verify(String token) {
        JWT.require(Algorithm.HMAC256(TOKEN_SECRET_KEY)).build().verify(token);
    }
 
  
    public static Long getUserIdByToken(HttpServletRequest request) {
        String token = request.getHeader(GlobalConstant.TOKEN);
        String userId = JWT.decode(token).getAudience().get(0);
        return Long.valueOf(userId);
    }
}