Introduction to Spring Security with a Basic Example
Spring Security is a powerful and highly customizable framework for authentication and access control in Java applications. Built on Spring’s AOP principles and implemented using servlet filters, it provides robust mechanisms for securing web endpoints and method-level authorization. It has become the de facto standard for securing Spring-based applications.
To get started quickly, create a Spring Boot project. If dependency resolusion fails due to Maven issues, adjust the parent version and Java compatibility as needed:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.13.RELEASE</version>
<relativePath/>
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
Include spring-boot-starter-security in your dependencies to enable security features automatically.
A minimal application might look like this:
@SpringBootApplication
@RestController
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@GetMapping("/hello")
public String greet(@RequestParam(value = "user", defaultValue = "Guest") String user) {
return "Hello " + user + "!";
}
}
When you run this application, Spring Security auto-configures a default username (user) and logs a genreated password to the console. This allows immediate testing of secured endpoints without additional configuraton.
