How to implement user authentication functionality usin…

To implement user authentication functionality with Spring Boot and JWT, the following steps need to be taken:

1. Add the necessary dependencies: Include the Spring Security and JWT dependencies in the pom.xml file.
2. Create a user entity class: Create a user entity class that includes basic user information and role information.
3. Create a user authentication service: Develop a user authentication service class that implements the UserDetailsService interface and overrides the loadUserByUsername method to retrieve user information from the database based on the username.
4. Create a JWT utility class: Develop a utility class for handling the generation and parsing of JSON Web Tokens (JWT).
5. Create a login interface: Develop a login interface that accepts the user’s username and password, verifies the user information through user authentication service, and generates a JWT using JWT tool class to send back to the frontend.
6. Create an authentication filter: Develop an authentication filter class that inherits from the OncePerRequestFilter class, and override the doFilterInternal method to validate the JWT’s validity and store user information in the SecurityContext upon each request.
7. Set up Spring Security: Configure Spring Security in the Spring Boot configuration file, specifying the relevant routes and rules for login and authentication.

The above outlines the basic steps for implementing user authentication with Spring Boot and JWT. The implementation can be adjusted based on project requirements.