如何在Spring Boot安全上将用户名传入application.properties的登录SQL代码？

spring.datasource.url=jdbc:mysql://localhost:3306/mydatabase
spring.datasource.username=${db.username}
spring.datasource.password=${db.password}

SELECT * FROM users WHERE username = :username

@Value("${spring.datasource.username}")
private String username;

String sql = "SELECT * FROM users WHERE username = :username";
Map<String, Object> paramMap = new HashMap<>();
paramMap.put("username", username);

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-security</artifactId>
</dependency>

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .authorizeRequests()
                .antMatchers("/login").permitAll()
                .anyRequest().authenticated()
                .and()
            .formLogin()
                .loginPage("/login")
                .defaultSuccessUrl("/home")
                .and()
            .logout()
                .logoutUrl("/logout")
                .logoutSuccessUrl("/login")
                .and()
            .csrf().disable();
    }
}

@Controller
public class LoginController {

    @GetMapping("/login")
    public String login() {
        return "login";
    }
}

@Service
public class UserDetailsServiceImpl implements UserDetailsService {

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        // 根据用户名查询用户信息，并返回UserDetails对象
        // ...
    }
}