From 1745a5d8216f002f243c6a9da578583857f3b587 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=B0=8F=E6=B5=B7?= <zh56462271@qq.com>
Date: Wed, 4 Dec 2019 15:54:45 +0800
Subject: [PATCH] Fix NullPointer Exception

---
 .../cn/celess/blog/configuration/filter/VisitorRecord.java  | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/main/java/cn/celess/blog/configuration/filter/VisitorRecord.java b/src/main/java/cn/celess/blog/configuration/filter/VisitorRecord.java
index 0082cc8..fdc465e 100644
--- a/src/main/java/cn/celess/blog/configuration/filter/VisitorRecord.java
+++ b/src/main/java/cn/celess/blog/configuration/filter/VisitorRecord.java
@@ -21,14 +21,18 @@ public class VisitorRecord implements HandlerInterceptor {
     @Override
     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
         HttpSession session = request.getSession();
+
         HashMap<String, Integer> visitDetail = (HashMap<String, Integer>) session.getAttribute("visitDetail");
+        if (visitDetail == null) {
+            return true;
+        }
         // 获取访问次数
         Integer count = visitDetail.get(RequestUtil.getCompleteUrlAndMethod(request));
         // 自增
         count = count == null ? 1 : ++count;
         // 更新
         visitDetail.put(RequestUtil.getCompleteUrlAndMethod(request), count);
-        session.setAttribute("ip",request.getRemoteAddr());
+        session.setAttribute("ip", request.getRemoteAddr());
         return true;
     }
 }