在最新版本的spring Boot 3.1.1**@EnableWebFluxSecurity中，springSecurityFilterChain，.csrf（），ServerHttpSecurity和.pathMatchers（）**已弃用，因此您必须更改代码。
如果你使用的是spring Boot 3，可以参考以下代码：

@EnableWebSecurity
@Configuration
@RequiredArgsConstructor
public class SecurityConfig {

    private final UserDetailServiceImpl userDetailsService;

    private final BCryptPasswordEncoder encoder;

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {

       http.csrf(csrf -> csrf.disable())
            .authorizeRequests().
            requestMatchers("/category/add")
            .authenticated()
            .requestMatchers("/authenticate","/register").permitAll()
            .anyRequest()
            .authenticated()
            .and().exceptionHandling(ex -> ex.authenticationEntryPoint(point))
            .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS));
    http.addFilterBefore(filter, UsernamePasswordAuthenticationFilter.class);
    return http.build();

    }

    @Bean
    public AuthenticationManager authenticationManager() throws Exception {
        return new CustomAuthenticationManager();
    }

    @Bean
    public DaoAuthenticationProvider authenticationProvider() {
        DaoAuthenticationProvider authenticationProvider = new DaoAuthenticationProvider();
        authenticationProvider.setUserDetailsService(userDetailsService);
        authenticationProvider.setPasswordEncoder(encoder);
        return authenticationProvider;
    }
}

字符串
CustomAuthenticationManager：

public class CustomAuthenticationManager implements AuthenticationManager {

    @Autowired
    private DaoAuthenticationProvider authenticationProvider;

    @Override
    public Authentication authenticate(Authentication authentication) throws AuthenticationException {
        return authenticationProvider.authenticate(authentication);
    }
}

型