How to get the SPRING Boot HOST and PORT address during run time?

Question

How could I get the host and port where my application is deployed during run-time so that I can use it in my java method?

Answer 1

You can get this information via Environment for the port and the host you can obtain by using InternetAddress.

@Autowired Environment environment;  // Port via annotation @Value("${server.port}") int aPort;  ...... public void somePlaceInTheCode() {     // Port     environment.getProperty("server.port");          // Local address     InetAddress.getLocalHost().getHostAddress();     InetAddress.getLocalHost().getHostName();          // Remote address     InetAddress.getLoopbackAddress().getHostAddress();     InetAddress.getLoopbackAddress().getHostName(); } 

Answer 2

If you use random port like server.port=${random.int[10000,20000]} method. and in Java code read the port in Environment use @Value or getProperty("server.port"). You will get a Unpredictable Port Because it is Random.

ApplicationListener, you can override onApplicationEvent to get the port number once it's set.

In Spring boot version Implements Spring interface ApplicationListener<EmbeddedServletContainerInitializedEvent>(Spring boot version 1) or ApplicationListener<WebServerInitializedEvent>(Spring boot version 2) override onApplicationEvent to get the Fact Port .

Spring boot 1

@Override public void onApplicationEvent(EmbeddedServletContainerInitializedEvent event) {     int port = event.getEmbeddedServletContainer().getPort(); } 

Spring boot 2

@Override public void onApplicationEvent(WebServerInitializedEvent event) {     Integer port = event.getWebServer().getPort();     this.port = port; }