I have a problem similar to that described in Mapping list in Yaml to list of objects in Spring Boot except that I would like to vary the identifier of least one of the fields in my object from the corresponding key name used in YAML.
For example:
YAML File:
config:
gateways:
-
id: 'g0'
nbrInputs: 128
nbrOutputs: 128
-
id: 'g1'
nbrInputs: 128
nbrOutputs: 128
Configuration Class:
@Configuration
@ConfigurationProperties(prefix="config")
public class GatewayConfig
{
List<Gateway> gateways = new ArrayList<Gateway>();
// Getter/Setter for gateways
// ...
public static class Gateway
{
private String id;
@Value("${nbrInputs}")
private int numInputs;
@Value("${nbrOutputs}")
private int numOutputs;
// Getters and Setters
// ...
}
}
I was hoping that the @Value annotations would allow me to inject the corresponding property values, but this does not seem to work (injection of the 'id' field seems to work just fine).
Is there a way to do this with @Value (or any other annotation)?
Thank you.
Edit: Note that I am looking to determine whether I can force a correspondence between a YAML property and a field in the inner POJO without changing the name of either . There are several reasons why I might want to do this - eg I might not control the format of the YAML file and I would like to use a more descriptive identifier name in my POJO than was used by the author of the YAML file.
As Stephave Nicoll mentioned, @Value
annotation has nothing to do with @ConfigurationProperties
. Just name fields in the inner POJO same as in configuration file and this should work:
@Configuration
@ConfigurationProperties(prefix="config")
@EnableConfigurationProperties
public class GatewayConfig
{
List<Gateway> gateways = new ArrayList<Gateway>();
// Getter/Setter for gateways
// ...
public static class Gateway
{
private String id;
private int nbrInputs;
private int nbrOutputs;
// Getters and Setters
// ...
}
}
Reaction on comment:
With plain Spring/Spring Boot, I don't think you can map fields with different names and load it to the list of gateways. There would be option to use plain @Value annotation, but your gateway count would need to be hard-coded:
@Component
public class Gateway0{
@Value("${config.gateways[0].id}")
private String id;
@Value("${config.gateways[0].nbrInputs}")
private int numInputs;
@Value("${config.gateways[0].nbrOutputs}")
private int numOutputs;
// Getters and Setters
// ...
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.