update ruoyi-framework/src/main/java/com/ruoyi/framework/shiro/session/OnlineSessionFactory.java.

ServletUtils.getRequest()应改request，可能为空

Signed-off-by: chenjh <asgard2023@outlook.com>

ruoyi-framework/src/main/java/com/ruoyi/framework/shiro/session/OnlineSessionFactory.java

@@ -28,7 +28,7 @@ public class OnlineSessionFactory implements SessionFactory
             HttpServletRequest request = (HttpServletRequest) sessionContext.getServletRequest();
             if (request != null)
             {
-                UserAgent userAgent = UserAgent.parseUserAgentString(ServletUtils.getRequest().getHeader("User-Agent"));
+                UserAgent userAgent = UserAgent.parseUserAgentString(request.getHeader("User-Agent"));
                 // 获取客户端操作系统
                 String os = userAgent.getOperatingSystem().getName();
                 // 获取客户端浏览器