Play Store Application link – Spring Boot in 13 steps – App on Google Play
Github project link – https://github.com/kuldeep101990/Spring-Boot-Security
Step 1: Setting Up a Spring Boot Project
Using Spring Initializr
- Go to https://start.spring.io/.
- Fill in the details:
- Project: Maven
- Language: Java
- Spring Boot: 3.x.x
- Dependencies: Spring Web, Spring Security
- Click Generate, and extract the downloaded ZIP file.
Import into IDE
- Open your IDE (e.g., IntelliJ or Eclipse).
- Import the extracted project as a Maven project.
Step 2: Configuring Basic Authentication
Spring Boot makes it simple to enable basic authentication with properties.
Add Basic Authentication in application.properties
spring.security.user.name=admin
spring.security.user.password=admin123
Create a REST Controller
package com.example.demo;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class SecurityController {
@GetMapping("/public")
public String publicEndpoint() {
return "This is a public endpoint";
}
@GetMapping("/secured")
public String securedEndpoint() {
return "This is a secured endpoint";
}
}
When accessing /secured, the browser will prompt for the username and password configured in application.properties.
Step 3: Role-Based Access Control
Configure Custom Roles
Add the following in SecurityConfig:
package com.example.demo;
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.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.provisioning.InMemoryUserDetailsManager;
import org.springframework.security.web.SecurityFilterChain;
@Configuration
public class SecurityConfig {
@Bean
public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
http
.authorizeHttpRequests(auth -> auth
.requestMatchers("/public").permitAll()
.requestMatchers("/secured").hasRole("USER")
.anyRequest().authenticated()
)
.httpBasic();
return http.build();
}
@Bean
public UserDetailsService userDetailsService() {
UserDetails user = User.withDefaultPasswordEncoder()
.username("user")
.password("user123")
.roles("USER")
.build();
UserDetails admin = User.withDefaultPasswordEncoder()
.username("admin")
.password("admin123")
.roles("ADMIN")
.build();
return new InMemoryUserDetailsManager(user, admin);
}
}
Test Role-Based Access
/public: Accessible by anyone./secured: Accessible only by users with theUSERrole.
Step 4: Securing REST APIs with JWT
Add Dependencies
Include the following in pom.xml:
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt-api</artifactId>
<version>0.11.5</version>
</dependency>
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt-impl</artifactId>
<version>0.11.5</version>
</dependency>
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt-jackson</artifactId>
<version>0.11.5</version>
</dependency>
Create a JWT Utility Class
package com.example.demo;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import java.util.Date;
public class JwtUtil {
private static final String SECRET_KEY = "mysecretkey";
public String generateToken(String username) {
return Jwts.builder()
.setSubject(username)
.setIssuedAt(new Date())
.setExpiration(new Date(System.currentTimeMillis() + 1000 * 60 * 60 * 10))
.signWith(SignatureAlgorithm.HS256, SECRET_KEY)
.compact();
}
public String validateToken(String token) {
return Jwts.parser()
.setSigningKey(SECRET_KEY)
.parseClaimsJws(token)
.getBody()
.getSubject();
}
}
Add a Login Endpoint
package com.example.demo;
import org.springframework.web.bind.annotation.*;
@RestController
public class JwtController {
private final JwtUtil jwtUtil = new JwtUtil();
@PostMapping("/login")
public String login(@RequestParam String username) {
return jwtUtil.generateToken(username);
}
}
Step 5: Advanced Security with OAuth2
Add OAuth2 Dependency
Include the following in pom.xml:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-oauth2-client</artifactId>
</dependency>
Configure OAuth2 Login
Add the following in application.properties:
spring.security.oauth2.client.registration.google.client-id=<your-client-id>
spring.security.oauth2.client.registration.google.client-secret=<your-client-secret>
spring.security.oauth2.client.registration.google.scope=profile,email
spring.security.oauth2.client.registration.google.redirect-uri={baseUrl}/login/oauth2/code/{registrationId}
Conclusion
In this guide, we:
- Configured basic authentication with Spring Boot.
- Implemented role-based access control.
- Secured REST APIs using JWT.
- Explored advanced security with OAuth2.
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