Hello! In this tutorial, we will explore backend development using Spring Boot<\/strong>. The main goal of this tutorial is to implement login\/logout and sign-up functionalities using Spring Security<\/strong>. The entire process will proceed through the following steps.<\/p>\n First, let’s set up a Spring Boot project. You can create a project using [Spring Initializr](https:\/\/start.spring.io\/). Please select the following settings.<\/p>\n Once the settings are complete, you can download the ZIP file by clicking the GENERATE<\/strong> button. After downloading, extract the contents and open the project in your preferred IDE.<\/p>\n To configure Spring Security, create a class called The code above shows how to configure user authentication and authorization, including an in-memory user store. It uses BCryptPasswordEncoder<\/strong> to encrypt passwords.<\/p>\n To implement sign-up functionality, we will create a Next, we will create a service and a controller to handle the sign-up process.<\/p>\n Now let’s create the HTML form for the sign-up.<\/p>\n Now, let’s implement the login page and the logout functionality. We will create another HTML for the login page.<\/p>\n The logout functionality is provided by Spring Security by default, so no additional implementation is necessary. When the logout endpoint is called, the session is terminated and the user is redirected to the login page.<\/p>\n In this tutorial, we laid the foundation for backend development using Spring Boot, learning how to implement login, logout, and sign-up functionalities utilizing Spring Security. This process will help you understand how to handle and manage user authentication in web applications. I hope you have established a base to advance to more sophisticated features. In the next tutorial, we will explore REST APIs and JWT authentication.<\/p>\n Thank you!<\/p>\n <\/body><\/p>\n","protected":false},"excerpt":{"rendered":"\n
1. Setting up a Spring Boot project<\/h2>\n
Project Settings<\/h3>\n
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2. Configuring Spring Security<\/h2>\n
SecurityConfig.java<\/code>. This class will define the necessary configurations for user authentication and authorization.<\/p>\npackage com.example.demo.config;\n\nimport org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\nimport org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;\nimport org.springframework.security.config.annotation.web.builders.HttpSecurity;\nimport org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;\nimport org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;\nimport org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;\nimport org.springframework.security.crypto.password.PasswordEncoder;\n\n@Configuration\n@EnableWebSecurity\npublic class SecurityConfig extends WebSecurityConfigurerAdapter {\n\n @Override\n protected void configure(AuthenticationManagerBuilder auth) throws Exception {\n auth.inMemoryAuthentication()\n .withUser(\"user\")\n .password(passwordEncoder().encode(\"password\"))\n .roles(\"USER\");\n }\n\n @Override\n protected void configure(HttpSecurity http) throws Exception {\n http.csrf().disable()\n .authorizeRequests()\n .antMatchers(\"\/register\").permitAll()\n .anyRequest().authenticated()\n .and()\n .formLogin()\n .loginPage(\"\/login\")\n .permitAll()\n .and()\n .logout()\n .permitAll();\n }\n\n @Bean\n public PasswordEncoder passwordEncoder() {\n return new BCryptPasswordEncoder();\n }\n}\n<\/code><\/pre>\n3. Implementing sign-up functionality<\/h2>\n
User<\/code> entity to store user information and a UserRepository<\/code> interface to handle user data storage.<\/p>\npackage com.example.demo.model;\n\nimport javax.persistence.Entity;\nimport javax.persistence.GeneratedValue;\nimport javax.persistence.GenerationType;\nimport javax.persistence.Id;\n\n@Entity\npublic class User {\n @Id\n @GeneratedValue(strategy = GenerationType.IDENTITY)\n private Long id;\n private String username;\n private String password;\n\n \/\/ getters and setters\n}\n<\/code><\/pre>\npackage com.example.demo.repository;\n\nimport com.example.demo.model.User;\nimport org.springframework.data.jpa.repository.JpaRepository;\n\npublic interface UserRepository extends JpaRepositorypackage com.example.demo.service;\n\nimport com.example.demo.model.User;\nimport com.example.demo.repository.UserRepository;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.security.crypto.password.PasswordEncoder;\nimport org.springframework.stereotype.Service;\n\n@Service\npublic class UserService {\n\n @Autowired\n private UserRepository userRepository;\n\n @Autowired\n private PasswordEncoder passwordEncoder;\n\n public void register(User user) {\n user.setPassword(passwordEncoder.encode(user.getPassword()));\n userRepository.save(user);\n }\n}\n<\/code><\/pre>\npackage com.example.demo.controller;\n\nimport com.example.demo.model.User;\nimport com.example.demo.service.UserService;\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Controller;\nimport org.springframework.ui.Model;\nimport org.springframework.web.bind.annotation.GetMapping;\nimport org.springframework.web.bind.annotation.PostMapping;\n\n@Controller\npublic class AuthController {\n\n @Autowired\n private UserService userService;\n\n @GetMapping(\"\/register\")\n public String showRegistrationForm(Model model) {\n model.addAttribute(\"user\", new User());\n return \"register\";\n }\n\n @PostMapping(\"\/register\")\n public String registerUser(User user) {\n userService.register(user);\n return \"redirect:\/login\";\n }\n}\n<\/code><\/pre>\n<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <meta charset=\"UTF-8\">\n <title>Sign Up<\/title>\n<\/head>\n<body>\n <h1>Sign Up<\/h1>\n <form action=\"\/register\" method=\"post\">\n <label for=\"username\">Username<\/label>\n <input type=\"text\" id=\"username\" name=\"username\" required><br>\n\n <label for=\"password\">Password<\/label>\n <input type=\"password\" id=\"password\" name=\"password\" required><br>\n\n <input type=\"submit\" value=\"Register\">\n <\/form>\n<\/body>\n<\/html>\n<\/code><\/pre>\n4. Implementing login and logout functionality<\/h2>\n
<!DOCTYPE html>\n<html lang=\"en\">\n<head>\n <meta charset=\"UTF-8\">\n <title>Login<\/title>\n<\/head>\n<body>\n <h1>Login<\/h1>\n <form action=\"\/login\" method=\"post\">\n <label for=\"username\">Username<\/label>\n <input type=\"text\" id=\"username\" name=\"username\" required><br>\n\n <label for=\"password\">Password<\/label>\n <input type=\"password\" id=\"password\" name=\"password\" required><br>\n\n <input type=\"submit\" value=\"Login\">\n <\/form>\n <a href=\"\/register\">Sign Up<\/a>\n<\/body>\n<\/html>\n<\/code><\/pre>\n5. Conclusion<\/h2>\n