Memetakan bidang titik geometri PostGIS dengan Hibernate pada Spring Boot

Akhirnya saya menemukan bahwa konfigurasi saya baik-baik saja dan mungkin Jackson yang tidak dapat mengelola Point tipe data dengan benar. Jadi saya menyesuaikan serialisasi dan deserialisasi JSON:

• tambahkan anotasi ini ke coordinates bidang:

  @JsonSerialize(using = PointToJsonSerializer.class)
  @JsonDeserialize(using = JsonToPointDeserializer.class)
  

• buat serializer seperti itu:

  import java.io.IOException;
  import com.fasterxml.jackson.core.JsonGenerator;
  import com.fasterxml.jackson.core.JsonProcessingException;
  import com.fasterxml.jackson.databind.JsonSerializer;
  import com.fasterxml.jackson.databind.SerializerProvider;
  import com.vividsolutions.jts.geom.Point;
  
  public class PointToJsonSerializer extends JsonSerializer<Point> {
  
      @Override
      public void serialize(Point value, JsonGenerator jgen,
              SerializerProvider provider) throws IOException,
              JsonProcessingException {
  
          String jsonValue = "null";
          try
          {
              if(value != null) {             
                  double lat = value.getY();
                  double lon = value.getX();
                  jsonValue = String.format("POINT (%s %s)", lat, lon);
              }
          }
          catch(Exception e) {}
  
          jgen.writeString(jsonValue);
      }
  
  }
  

• buat deserializer seperti itu:

  import java.io.IOException;
  import com.fasterxml.jackson.core.JsonParser;
  import com.fasterxml.jackson.core.JsonProcessingException;
  import com.fasterxml.jackson.databind.DeserializationContext;
  import com.fasterxml.jackson.databind.JsonDeserializer;
  import com.vividsolutions.jts.geom.Coordinate;
  import com.vividsolutions.jts.geom.GeometryFactory;
  import com.vividsolutions.jts.geom.Point;
  import com.vividsolutions.jts.geom.PrecisionModel;
  
  public class JsonToPointDeserializer extends JsonDeserializer<Point> {
  
      private final static GeometryFactory geometryFactory = new GeometryFactory(new PrecisionModel(), 26910); 
  
      @Override
      public Point deserialize(JsonParser jp, DeserializationContext ctxt)
              throws IOException, JsonProcessingException {
  
          try {
              String text = jp.getText();
              if(text == null || text.length() <= 0)
                  return null;
  
              String[] coordinates = text.replaceFirst("POINT ?\\(", "").replaceFirst("\\)", "").split(" ");
              double lat = Double.parseDouble(coordinates[0]);
              double lon = Double.parseDouble(coordinates[1]);
  
              Point point = geometryFactory.createPoint(new Coordinate(lat, lon));
              return point;
          }
          catch(Exception e){
              return null;
          }
      }
  
  }
  

Mungkin Anda juga bisa menggunakan serializer ini dan deserializer ini, tersedia di sini.