JarCastingBremersee GeoJSON
This project contains modules for reading and writing GeoJSON. The GeoJSON format is specified in rfc7946.
Maven Site
Usage
GeoJSON can be read or written with adding the GeoJsonObjectMapperModule to the ObjectMapper or without.
Without adding the GeoJsonObjectMapperModule to the ObjectMapper
If you do not add the GeoJsonObjectMapperModule to the ObjectMapper, you'll have to use the GeometryWrapper:
public class Example {
public static void main(String[] args) {
ObjectMapper om = new ObjectMapper();
Point p = GeometryUtils.createPoint(10.2, 52.4);
GeometryWrapper gw = new GeometryWrapper(p);
String json = om.writeValueAsString(gw);
System.out.println(json);
}
}
GeoJsonFeature and GeoJsonFeatureCollection can be used without adding the module to the object mapper, too.
public class Example {
public static void main(String[] args) {
ObjectMapper om = new ObjectMapper();
Point p = GeometryUtils.createPoint(10.2, 52.4);
GeoJsonFeature f = new GeoJsonFeature("id", p, false, null);
String json = om.writeValueAsString(f);
System.out.println(json);
}
}
With adding the GeoJsonObjectMapperModule to the ObjectMapper
If you add the GeoJsonObjectMapperModule to the ObjectMapper, you'll be able to process the geometry object directly:
public class Example {
public static void main(String[] args) {
ObjectMapper om = new ObjectMapper();
om.registerModule(new GeoJsonObjectMapperModule());
Point p = GeometryUtils.createPoint(10.2, 52.4);
String json = om.writeValueAsString(p);
System.out.println(json);
}
}
Spring Data MongoDB Support
If you want to persist the JTS geometry objects to a MongoDB with Spring Data you'll have to register these converters:
@Configuration
public class PersistenceConfiguration {
@Primary
@Bean
public MongoCustomConversions customConversions() {
final List<Object> converters = new ArrayList<>(
GeoJsonConverters.getConvertersToRegister(null));
// add more custom converters
return new MongoCustomConversions(converters);
}
}
An entity may look like this:
@Document(collection = "feature")
@TypeAlias("Route")
public class RouteEntity {
@Id
private String id;
@GeoSpatialIndexed(type = GeoSpatialIndexType.GEO_2DSPHERE)
private MultiLineString geometry; // this is org.locationtech.jts.geom.MultiLineString
private double[] bbox;
private RouteProperties properties;
// getter and setter
}