How does the Shiro framework achieve permission control?
There are several ways in which the Shiro framework can implement access control:
- Authentication: Shiro can verify the identity of a user by authenticating with a username and password. During the authentication process, the user’s password can be validated, encrypted using cryptographic algorithms, and compared with user information stored in a database or other storage.
- Authorization: Shiro can grant access to resources based on roles and permissions to determine which users can access them. Roles can be used to group users and assign specific permissions to each role. Permissions can be at the level of operations, such as create, read, update, and delete, or at the level of specific data instances.
- Filters: The Shiro framework offers a range of filters that can perform pre-processing before a user accesses a resource. These filters can be used to check if a user is logged in, if they have specific roles or permissions, and to control access to certain resources.
- Custom Realm: A Realm is a component in Shiro used to retrieve security data (such as users, roles, permissions). By extending the Realm interface and implementing a custom Realm, it is possible to achieve personalized authentication and authorization logic, allowing for custom control over user permissions.
- Annotation support: Shiro offers support for annotations, allowing developers to use annotations in their code to indicate methods or classes that require permission control. By using annotations, the configuration and management process of permission control can be simplified.
In conclusion, the Shiro framework allows for a flexible and customizable permission control mechanism through functions such as authentication, authorization, filters, custom Realms, and annotation support.
