Comment mettre en œuvre la sécurité dans une application de démarrage de printemps?

Je crée une application de printemps pour un projet collégial et j'ai besoin d'aide à mettre en œuvre une page de connexion

package com.sales.security;

import org.springframework.context.annotation.Bean;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

@Configuration
@EnableGlobalMethodSecurity(prePostEnabled = true, securedEnabled = true)
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter{ 
 @Override
 protected void configure(HttpSecurity http) throws Exception {
  http
    .authorizeRequests()
    .antMatchers("/showProducts.html", "/showOrders.html", "/showCustomers.html","/newOrder.html","/addProduct.html","/addCustomer.html")
    .authenticated()
    .and()
    .formLogin();
  }

 private static final String ENCODED_PASSWORD = "$2y$12$i4Cl5SZgrPFItSz/G5cvTObf0sqzHszwwKMZ4pQeUlElY1BR7KxdO"; //password is "user" encrypted using BCrypt


 @Override
 protected void configure(AuthenticationManagerBuilder auth) throws Exception {
     auth.inMemoryAuthentication()
         .passwordEncoder(passwordEncoder())
         .withUser("user").password(ENCODED_PASSWORD).roles("USER");
 }


 @Bean
 public PasswordEncoder passwordEncoder() {
     return new BCryptPasswordEncoder();
 }
}