Click Generate to download the ZIP file<\/li>\n<\/ol>\n3. Understanding Project Structure<\/h2>\n
When you open the generated project, you can see the following main directory and file structure.<\/p>\n
\n \u251c\u2500\u2500 src\n \u2502 \u251c\u2500\u2500 main\n \u2502 \u2502 \u251c\u2500\u2500 java\n \u2502 \u2502 \u2502 \u2514\u2500\u2500 com\n \u2502 \u2502 \u2502 \u2514\u2500\u2500 example\n \u2502 \u2502 \u2502 \u2514\u2500\u2500 demo\n \u2502 \u2502 \u2502 \u251c\u2500\u2500 DemoApplication.java\n \u2502 \u2502 \u2502 \u2514\u2500\u2500 configuration\n \u2502 \u2502 \u2502 \u2514\u2500\u2500 SecurityConfig.java\n \u2502 \u2502 \u2514\u2500\u2500 resources\n \u2502 \u2502 \u251c\u2500\u2500 application.properties\n \u2502 \u2502 \u2514\u2500\u2500 static\n \u2502 \u2514\u2500\u2500 test\n \u251c\u2500\u2500 pom.xml\n <\/pre>\nHere, the DemoApplication.java<\/code> file is the main application file, and application.properties<\/code> is the configuration file.<\/p>\n4. Adding Dependencies<\/h2>\n
The project we created includes the necessary libraries as Maven dependencies. Let’s open the pom.xml<\/code> file to check the added dependencies.<\/p>\n\n <dependencies>\n <dependency>\n <groupId>org.springframework.boot<\/groupId>\n <artifactId>spring-boot-starter-web<\/artifactId>\n <\/dependency>\n <dependency>\n <groupId>org.springframework.boot<\/groupId>\n <artifactId>spring-boot-starter-security<\/artifactId>\n <\/dependency>\n <dependency>\n <groupId>org.springframework.boot<\/groupId>\n <artifactId>spring-boot-starter-data-jpa<\/artifactId>\n <\/dependency>\n <dependency>\n <groupId>com.h2database<\/groupId>\n <artifactId>h2<\/artifactId>\n <scope>runtime<\/scope>\n <\/dependency>\n <\/dependencies>\n <\/pre>\n5. Implementing Registration Functionality<\/h2>\n
To allow users to register, we need to save and manage user information. For this purpose, we will create a user entity using JPA and set up the connection to the database.<\/p>\n
5.1 Creating the User Entity<\/h3>\n
First, let’s create an entity class called User<\/code>. This class holds user information.<\/p>\n\n package com.example.demo.model;\n\n import javax.persistence.*;\n\n @Entity\n public class User {\n @Id\n @GeneratedValue(strategy = GenerationType.IDENTITY)\n private Long id;\n \n private String username;\n private String password;\n private String email;\n\n \/\/ Getters and Setters\n }\n <\/pre>\n5.2 Creating UserRepository<\/h3>\n
Now, we will create a UserRepository<\/code> interface to save and retrieve user information from the database.<\/p>\n\n package com.example.demo.repository;\n\n import com.example.demo.model.User;\n import org.springframework.data.jpa.repository.JpaRepository;\n\n public interface UserRepository extends JpaRepository {\n User findByUsername(String username);\n }\n <\/pre>\n5.3 Writing the Registration Service<\/h3>\n
We will write a service class to handle the registration logic.<\/p>\n
\n package com.example.demo.service;\n\n import com.example.demo.model.User;\n import com.example.demo.repository.UserRepository;\n import org.springframework.beans.factory.annotation.Autowired;\n import org.springframework.stereotype.Service;\n\n @Service\n public class UserService {\n @Autowired\n private UserRepository userRepository;\n\n public User registerNewUser(User user) {\n return userRepository.save(user);\n }\n }\n <\/pre>\n6. Configuring Spring Security<\/h2>\n
Now we will set up Spring Security to implement login and logout functionalities.<\/p>\n
6.1 Creating SecurityConfig Class<\/h3>\n
We will create a class for security configuration.<\/p>\n
\n package com.example.demo.configuration;\n\n import com.example.demo.service.UserService;\n import org.springframework.beans.factory.annotation.Autowired;\n import org.springframework.context.annotation.Bean;\n import org.springframework.context.annotation.Configuration;\n import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;\n import org.springframework.security.config.annotation.web.builders.HttpSecurity;\n import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;\n import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;\n\n @Configuration\n @EnableWebSecurity\n public class SecurityConfig extends WebSecurityConfigurerAdapter {\n @Autowired\n private UserService userService;\n\n @Override\n protected void configure(AuthenticationManagerBuilder auth) throws Exception {\n auth.userDetailsService(userService);\n }\n\n @Override\n protected void configure(HttpSecurity http) throws Exception {\n http\n .authorizeRequests()\n .antMatchers(\"\/register\", \"\/h2-console\/**\").permitAll()\n .anyRequest().authenticated()\n .and()\n .formLogin()\n .loginPage(\"\/login\")\n .permitAll()\n .and()\n .logout()\n .permitAll();\n }\n }\n <\/pre>\n7. Implementing Registration and Login Controllers<\/h2>\n
We will write a controller to handle registration and login functionalities.<\/p>\n