How can you run Spring boot application on custom port?

ghz 9months ago ⋅ 58 views

In Spring Boot, you can run your application on a custom port by specifying the desired port number in your application configuration. There are several ways to achieve this:

  1. Using application.properties or application.yml:

    You can define the port number in the application.properties file or application.yml file under the src/main/resources directory. Simply add a property like server.port and set it to the desired port number. For example:

    # application.properties
server.port=8081

    # application.yml
server:
  port: 8081

  2. Using Command-line Arguments:

    You can specify the port number as a command-line argument when running your Spring Boot application. Use the --server.port option followed by the desired port number. For example:

    java -jar your-application.jar --server.port=8081

  3. Using Environment Variables:

    You can set an environment variable to define the port number. Spring Boot automatically maps certain environment variables to configuration properties. For example, you can set the SERVER_PORT environment variable to the desired port number:

    export SERVER_PORT=8081

  4. Programmatically in Code:

    You can programmatically set the port number in your Spring Boot application code. This approach is less common but can be useful in certain scenarios. For example:

    import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.server.ConfigurableWebServerFactory;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
public class YourApplication {

    public static void main(String[] args) {
        SpringApplication.run(YourApplication.class, args);
    }

    @Bean
    public WebServerFactoryCustomizer<ConfigurableWebServerFactory> webServerFactoryCustomizer() {
        return factory -> factory.setPort(8081);
    }
}

Choose the method that best suits your requirements and preferences. Each approach provides flexibility in configuring the port for your Spring Boot application.

#spring