import org.apache.shiro.SecurityUtils;

This line of code imports the SecurityUtils class from the Apache Shiro library. This class provides a set of utility methods for working with SecurityManager and Subject instances, which are used for authentication and authorization in Shiro. It is commonly used in Shiro-based applications to obtain the current user's Subject or SecurityManager instance, and to perform various security-related operations such as logging in or out, checking permissions, and retrieving authentication status.