修复热部署引起Null

ruoyi-framework/src/main/java/com/ruoyi/framework/web/base/BaseController.java

@@ -129,7 +129,7 @@ public class BaseController
 
     public SysUser getSysUser()
     {
-        return (SysUser) ShiroUtils.getSession().getAttribute("sysUser");
+        return ShiroUtils.getSysUser();
     }
 
     public void setSysUser(SysUser user)