修复jwt校验失败后的bug

novel-front/src/main/java/com/java2nb/novel/core/utils/JwtTokenUtil.java

@@ -86,15 +86,19 @@ public class JwtTokenUtil {
      */
     private boolean isTokenExpired(String token) {
         Date expiredDate = getExpiredDateFromToken(token);
+        if(expiredDate == null){
+            return true;
+        }else {
             return expiredDate.before(new Date());
         }
+    }
 
     /**
      * 从token中获取过期时间
      */
     private Date getExpiredDateFromToken(String token) {
         Claims claims = getClaimsFromToken(token);
-        return claims.getExpiration();
+        return claims != null ? claims.getExpiration() : null;
     }
 
     /**