Spring Security Tutorial

The step-by-step tutorial for implementing Spring Security in a Spring Boot application. This tutorial will cover basic security configuration, user authentication, authorization, and a simple login/logout feature.

Step 1: Create a Spring Boot Project

Start by creating a new Spring Boot project using Spring Initializr or your preferred development environment.

Step 2: Configure Spring Security

Create a security configuration class that extends WebSecurityConfigurerAdapter.

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

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

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.inMemoryAuthentication()
            .withUser("user").password(passwordEncoder().encode("password")).roles("USER")
            .and()
            .withUser("admin").password(passwordEncoder().encode("adminpassword")).roles("ADMIN");
    }

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

Step 3: Create Login and Logout Pages

Create Thymeleaf templates for the login and logout pages.

• src/main/resources/templates/login.html
• src/main/resources/templates/logout.html

Step 4: Create Controllers

Create controllers for the login and logout pages.

@Controller
public class LoginController {

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

@Controller
public class LogoutController {

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

Step 5: Create Home Page

Create a simple home page template.

• src/main/resources/templates/home.html

Step 6: Run the Application

Run your Spring Boot application and navigate to http://localhost:8080/home. You can access the login page by going to http://localhost:8080/login.

This tutorial provides a basic introduction to setting up Spring Security in a Spring Boot application. Keep in mind that for a production environment, you should consider more advanced security features such as user authentication against a database, role-based access control, securing APIs, and more. The above code should be a starting point for understanding the setup and how different components interact in Spring Security.