About Lesson
Create a logout method in the UserController. This method will return ResponseEntity and take a request parameter as token. Next, call a logout method from the UserService, which we’ll create next. This method will take the token as a parameter.
@PostMapping(“/logout”)
public ResponseEntity<Void> logout(@RequestParam(“token”) String token){
userService.logout(token);
return new ResponseEntity<>(HttpStatus.OK);
}
Next, within the UserService, establish a method named Logout. First, call the findByValueAndIsDeletedEquals method from tokenRepository. Check if it is empty; if so, return. Otherwise, set deleted to true and save it in the repository.
public void logout(String token) {
Optional<Token> tokenOptional
= tokenRepository.findByValueAndIsDeletedEquals(token, false);
if (tokenOptional.isEmpty()) {
// throw an exception saying token is not present or already deleted.
return ;
}
Token updatedToken = tokenOptional.get();
updatedToken.setDeleted(true);
tokenRepository.save(updatedToken);
}
Next, Write a method findByValueAndDeletedEquals in TokenRepository.
@Repository
public interface TokenRepository extends JpaRepository<Token, Long> {
Optional<Token> findByValueAndIsDeletedEquals(String token, boolean isDeleted);
}
Next now open postman
Now, open Postman and select the method as POST. Use the URL http://localhost:8080/logout?token=tokenvalue.
Click on “Send“. If this works, it will not return any response but you can check in the database. Select token table ad check isDeleted column is true
