Spring Boot is a popular framework for developing Java-based applications, and it offers a lot of flexibility when it comes to configuring the various components of your application. One of the most important aspects of configuring a Spring Boot application is setting the port on which the application will listen for incoming requests. In this blog post, we will discuss how to configure the port for a Spring Boot application and the different ways in which you can do this.
Configuring the Port in the Application Properties File
The most common way to configure the port for a Spring Boot application is by using the application.properties file. This file is located in the src/main/resources directory of your project and contains various configuration settings for your application. To configure the port, you need to add the following line to the application.properties file:
server.port=8080
This tells Spring Boot to start the application on port 8080. You can replace 8080 with any other port number that is not in use on your system.
Configuring the Port using Command Line Arguments
Another way to configure the port for a Spring Boot application is by using command line arguments. When you run a Spring Boot application, you can pass in command line arguments that will be used to configure the application. To configure the port, you can pass in the following argument:
-Dserver.port=8080
This tells Spring Boot to start the application on port 8080. You can replace 8080 with any other port number that is not in use on your system.
Configuring the Port using Environment Variables
You can also configure the port for a Spring Boot application by using environment variables. To do this, you need to set the following environment variable:
SERVER_PORT=8080
This tells Spring Boot to start the application on port 8080. You can replace 8080 with any other port number that is not in use on your system.
Configuring the Port in the Application Code
You can also configure the port for a Spring Boot application by directly modifying the application code. To do this, you need to add the following line of code to the main class of your application:
@Value("${server.port}")
int port;
This tells Spring Boot to read the value of the server.port property and assign it to the port variable. You can then use this variable to configure the port for your application.
Conclusion
In this blog post, we have discussed how to configure the port for a Spring Boot application and the different ways in which you can do this. The most common way is by using the application.properties file, but you can also use command line arguments, environment variables, or directly modify the application code. Whichever method you choose, make sure to test your application to ensure that it is listening on the correct port.