java-ee Java RESTful Web Services (JAX-RS) Custom parameter converters
Example
This is an example of how to implement custom parameter converters for JAX-RS endpoints. The example shows two classes from Java 8's java.time library.
@Provider
public class ParamConverters implements ParamConverterProvider {
@Override
public <T> ParamConverter<T> getConverter(Class<T> rawType,
Type genericType,
Annotation[] annotations)
{
if (rawType == LocalDate.class)
return (ParamConverter<T>) new ParamConverter<LocalDate>() {
@Override
public LocalDate fromString(String value) {
return LocalDate.parse(value);
}
@Override
public String toString(LocalDate value) {
return null;
}
};
else if (rawType == MonthDay.class)
return (ParamConverter<T>) new ParamConverter<MonthDay>() {
@Override
public MonthDay fromString(String value) {
int[] ddmm = Arrays.stream(value.split("/"))
.mapToInt(Integer::parseInt)
.toArray();
return MonthDay.of(ddmm[1], ddmm[0]);
}
@Override
public String toString(MonthDay value) {
return null;
}
};
return null;
}
}
