How can secure login authentication be implemented in Tomcat?

There are several ways to implement secure login authentication in Tomcat.

1. Authenticate using built-in Realm: Tomcat has various built-in Realms, such as JDBCRealm based on databases, JNDIRealm based on LDAP, and others. Users can configure the appropriate Realm based on their needs.
2. Install SSL certificate: Secure data transmission by configuring Tomcat to support SSL and using the HTTPS protocol.
3. Configure security constraints: Configure security constraints in the web.xml file to specify the URL paths that require authentication and authorization, as well as the corresponding role requirements.
4. You can utilize Tomcat authentication filters, such as FormAuthenticator and BasicAuthenticator provided by Tomcat, to enable authentication for specific paths.
5. Integrate third-party identity authentication services: Secure login authentication can be achieved by integrating third-party identity authentication services such as OAuth, LDAP, etc.