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autowired spring

Innocent Iguana answered on February 20, 2024 Popularity 9/10 Helpfulness 4/10

answer autowired spring

autowired spring

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// ApplicationConfig.java (Your bean configuration class where you set up the beans)
@Configuration
@PropertySource("classpath:application.properties") // path to property file
@ComponentScan(basePackages = "com.examplepackage") // path to the root package to scan for beans by IoC Container
public class ApplicationConfig {
    // No need to define @Bean methods for GreetingService and HelloController
    // Spring will automatically detect and instantiate beans based on component scanning
}


// application.properties (Values can also be overriden by run configuration variables(VM/ args/ Config class etc))
app.greeting=Hello, World!

// GreetingService.java (The service interface)
public interface GreetingService {
    String greet();
}
// GreetingServiceImpl.java (The service implementation)
@Service
public class GreetingServiceImpl implements GreetingService {

    @Value("${app.greeting}") // pull data from application.properties file
    private String greetingMessage;

    @Override
    public String greet() {
        return greetingMessage;
    }
}

//HelloController.java (The controller that needs the service dependency)
@RestController
public class HelloController {

    private final GreetingService greetingService;

    @Autowired // the service dependency will be injected here by the IoC Container
    public HelloController(GreetingService greetingService) {
        this.greetingService = greetingService;
    }

    @GetMapping("/") // API or route to access the service output
    public String hello() {
        return greetingService.greet();
    }
}

// Application.java (Main class)
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Popularity 9/10 Helpfulness 4/10 Language java

Source: Grepper

Tags: autowired java spring

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Contributed on Feb 20 2024

Innocent Iguana

0 Answers Avg Quality 2/10

autowired spring

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