0608 fix bug

novel-demo/src/main/java/com/sf/config/TokenInterceptor.java

@@ -20,7 +20,7 @@ public class TokenInterceptor implements HandlerInterceptor {
     @Override
     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
         String token = request.getHeader("Authorization");
-        if (token != null) {
+        if (token != null && !token.equals("null")) {
             Long uid = jwtUtils.parseToken(token, "front");
             System.out.println("用拦截器解析uid: " + uid);
             UserHolder.setUserId(uid);