How to get local server host and port in Spring Boot

Question

I m starting up a Spring Boot application with mvn spring-boot run   One of my  Controllers needs information about the host and port the application is listening on  i e  localhost 8080  or 127 x y z 8080   Following the Spring Boot documentation  I use the server address and server port properties    Controller public class MyController         Value    server address        private String serverAddress        Value    server port        private String serverPort                  When starting up the application with mvn spring-boot run  I get the following exception   org springframework beans factory BeanCreationException  Error creating bean with name  myController   Injection of autowired dependencies failed  nested exception is  org springframework beans factory BeanCreationException  Could not autowire field      String     serverAddress  nested exception is java lang IllegalArgumentException  Could not resolve placeholder  server address  in string value    server address     Both server address and server port cannot be autowired   How can I find out the  local  host address NIC and port that a Spring Boot application is binding on

User · Answer

I have just found a way to get server ip and port easily by using Eureka client library. As I am using it anyway for service registration, it is not an additional lib for me just for this purpose.

You need to add the maven dependency first:

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    <version>2.2.2.RELEASE</version>
</dependency>

Then you can use the ApplicationInfoManager service in any of your Spring beans.

@Autowired
private ApplicationInfoManager applicationInfoManager;
...

InstanceInfo applicationInfo = applicationInfoManager.getInfo();

The InstanceInfo object contains all important information about your service, like IP address, port, hostname, etc.

User · Answer

You can get port info via   Value    local server port    private String serverPort

User · Answer

I used to declare the configuration in application properties like this  you can use you own property file   server host   localhost server port   8081   and in application you can get it easily by  Value    server host    and  Value    server port    as field level annotation   or if in your case it is dynamic than you can get from system properties  Here is the example   Value    systemproperties  server host       Value    systemproperties  server port       For a better understanding of this annotation   see this example Multiple uses of  Value annotation

User · Answer

You can get hostname from spring cloud property in spring-cloud-commons-2 1 0 RC2 jar  environment getProperty  spring cloud client ip-address    environment getProperty  spring cloud client hostname      spring factories of spring-cloud-commons-2 1 0 RC2 jar   org springframework boot env EnvironmentPostProcessor   org springframework cloud client HostInfoEnvironmentPostProcessor

User · Answer

To get the port number in your code you can use the following    Autowired Environment environment    GetMapping   test   String testConnection        return  Your server is up and running at port    environment getProperty  local server port              To understand the Environment property you can go through this Spring boot Environment

User · Answer

For Spring 2  val hostName   InetAddress getLocalHost   hostName  var webServerPort  Int   0  Configuration class ApplicationListenerWebServerInitialized   ApplicationListener lt WebServerInitializedEvent gt        override fun onApplicationEvent event  WebServerInitializedEvent            webServerPort   event webServer port           then you can use also webServerPort from anywhere

User · Answer

An easy workaround  at least to get the running port  is to add the parameter javax servlet HttpServletRequest in the signature of one of the controller s methods  Once you have the HttpServletRequest instance is straightforward to get the baseUrl with this  request getRequestURL   toString    Have a look at this code    PostMapping value     registration    produces    application json   public StringResponse register  RequestBody RequestUserDTO userDTO       HttpServletRequest request    request getRequestURL   toString      value  http   localhost 8080 registration ------ return

User · Answer

IP Address  You can get network interfaces with NetworkInterface getNetworkInterfaces    then the IP addresses off the NetworkInterface objects returned with  getInetAddresses    then the string representation of those addresses with  getHostAddress     Port  If you make a  Configuration class which implements ApplicationListener lt EmbeddedServletContainerInitializedEvent gt   you can override onApplicationEvent to get the port number once it s set    Override public void onApplicationEvent EmbeddedServletContainerInitializedEvent event        int port   event getEmbeddedServletContainer   getPort

User · Answer

One solution mentioned in a reply by  M  Deinum is one that I ve used in a number of Akka apps   object Localhost                return String for the local hostname         def hostname    String   InetAddress getLocalHost getHostName              return String for the host IP address         def ip    String   InetAddress getLocalHost getHostAddress      I ve used this method when building a callback URL for Oozie REST so that Oozie could callback to my REST service and it s worked like a charm

[java] How to get local server host and port in Spring Boot?

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