Spring Boot Backend Development Course, Implementing Login Logout with Spring Security, User Registration, Configuring Security

Hello, in this course, we will explore how to develop backend applications using Spring Boot, specifically focusing on implementing login and sign-up features utilizing Spring Security. This course is designed for both beginners and intermediate learners, and aims to facilitate understanding through practical exercises.

1. What is Spring Boot?

Spring Boot is a feature based on the Spring framework that helps you develop applications quickly without complex configurations. It automatically provides necessary configurations, thereby enhancing productivity and simplifying deployment.

1.1 Features of Spring Boot

  • Auto Configuration: Automatically provides necessary configurations without the developer needing to set them up.
  • Dependency Management: Easily manage required libraries through Maven or Gradle.
  • External Configuration: Allows for management of properties files externally, making it easy to change configurations based on the environment.
  • Standalone: Provides an embedded server, allowing the application to run without deploying it on a separate server.

2. What is Spring Security?

Spring Security is a powerful framework that provides authentication and authorization features for Spring applications. Using this library, you can easily implement login functionality, user role management, and security filtering.

2.1 Key Concepts of Spring Security

  • Authentication: Verifying user identity (login).
  • Authorization: Granting access rights to specific resources to authenticated users.
  • Security Filter Chain: A chain of filters to intercept requests and apply security policies.

3. Setting Up the Development Environment

To develop Spring Boot applications, you need to set up a basic development environment. Below are the necessary tools:

  • Java Development Kit (JDK) 11 or higher
  • IDE: IntelliJ IDEA, Eclipse, etc.
  • Maven or Gradle
  • Git (optional)

3.1 Project Structure


    my-spring-boot-app
    ├── src
    │   ├── main
    │   │   ├── java
    │   │   │   └── com
    │   │   │       └── example
    │   │   │           └── demo
    │   │   │               ├── DemoApplication.java
    │   │   │               └── security
    │   │   │                   └── SecurityConfig.java
    │   │   ├── resources
    │   │   │   ├── application.properties
    │   └── test
    └── pom.xml

4. Creating a Spring Boot Application

Follow the steps below to generate a Spring Boot application.

4.1 Using Spring Initializr

Access Spring Initializr and create a project with the following settings:

  • Project: Maven Project
  • Language: Java
  • Spring Boot: 2.5.4 (or the latest version)
  • Group: com.example
  • Artifact: demo
  • Dependencies: Spring Web, Spring Security, Spring Data JPA, H2 Database

4.2 Download the Generated Project and Open in IDE

Download the generated project zip file and open it in your IDE. You will see that the basic structure for a Spring Boot application has been set up.

5. Implementing Sign-Up Feature

Now, let’s implement the sign-up feature. We will set up a registration form and an endpoint for user login.

5.1 Creating Sign-Up DTO


    package com.example.demo.dto;

    public class SignUpDto {
        private String username;
        private String password;
        private String email;

        // Getters and Setters
    }

5.2 Creating Sign-Up Service


    package com.example.demo.service;

    import com.example.demo.dto.SignUpDto;
    import com.example.demo.entity.User;

    public interface UserService {
        User registerNewUserAccount(SignUpDto signUpDto);
    }

5.3 Creating User Entity


    package com.example.demo.entity;

    import javax.persistence.*;

    @Entity
    public class User {
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        private Long id;

        private String username;
        private String password;

        @Column(unique = true)
        private String email;

        // Getters and Setters
    }

6. Configuring Spring Security

We will configure Spring Security to implement user authentication and role management.

6.1 Creating SecurityConfig Class


    package com.example.demo.security;

    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    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;

    @Configuration
    @EnableWebSecurity
    public class SecurityConfig extends WebSecurityConfigurerAdapter {
        @Override
        protected void configure(HttpSecurity http) throws Exception {
            http
                .csrf().disable()
                .authorizeRequests()
                .antMatchers("/signup", "/").permitAll()
                .anyRequest().authenticated()
                .and()
                .formLogin()
                .loginPage("/login")
                .permitAll()
                .and()
                .logout()
                .permitAll();
        }
    }

6.2 Implementing Login and Logout Endpoints


    package com.example.demo.controller;

    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;

    @Controller
    public class AuthController {

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

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

7. Conclusion

In this course, we learned how to develop a simple backend application using Spring Boot and implement user authentication and sign-up features with Spring Security. You can apply this knowledge in real projects and further enhance your understanding through practical exercises.

Additional References