I have this application.properties:
url.up=${url:http://localhost:8080/upload} And I want to extract the url "http://localhost:8080/upload". How can I extract it?
I tried something like this, but the url is null:
String url = config.getPropertyValue("url"); Where getPropertyValue:
public String getPropertyValue(String propertyKey) { return properties.getProperty(propertyKey); } You should use @Value annotation. For example:
@Value("${url}") private String url; The url variable holds http://localhost:8080/upload.
U can use @Value in your class in your property file U can define
url.up=http://localhost:8080/upload In Your class
@Value("${url.up}") private String url; then U can access the value using variable url
Unfortunately I do not know what class the config object is instatiated from which makes it hard to understand what the properties.getProperty() method call is doing. Therefore, I'll give you a a more general answer. As you are using Spring, you basically have two very elegant solutions to retrieve data from your application property files. If you just need a single value (as in your example the url.up field), then you would typically directly inject that value into the class that needs this data as in the following short Kotlin snippet (in java this would be very similar, just look up the @Value annotation on the internet).
@Component class PropertyPrinter( @Value("\${url.up}") private val url: String ) { @PostConstruct fun postConstruct() { println("URL is: $url") } } The other way would be to create a dedicated config class that hold a bunch logically connected fields and add the @ConfigurationProperties annotation. See here for a more in depth explanation.
You should use @Value or appContext:
