java geojson中rings数组部分转wkt

以下是将GeoJSON中的rings数组转换为WKT格式的Java代码：

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ArrayNode;
import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.geom.LinearRing;
import org.locationtech.jts.geom.Polygon;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class GeoJsonToWktConverter {

    public static String convert(String geoJson) throws IOException {
        ObjectMapper mapper = new ObjectMapper();
        ArrayNode coordinates = (ArrayNode) mapper.readTree(geoJson).get("coordinates");

        GeometryFactory geometryFactory = new GeometryFactory();
        List<Coordinate[]> rings = new ArrayList<>();
        for (int i = 0; i < coordinates.size(); i++) {
            ArrayNode ringCoordinates = (ArrayNode) coordinates.get(i);
            Coordinate[] ring = new Coordinate[ringCoordinates.size()];
            for (int j = 0; j < ringCoordinates.size(); j++) {
                ArrayNode coordinate = (ArrayNode) ringCoordinates.get(j);
                double x = coordinate.get(0).asDouble();
                double y = coordinate.get(1).asDouble();
                ring[j] = new Coordinate(x, y);
            }
            rings.add(ring);
        }

        LinearRing[] linearRings = new LinearRing[rings.size() - 1];
        for (int i = 1; i < rings.size(); i++) {
            linearRings[i - 1] = geometryFactory.createLinearRing(rings.get(i));
        }

        Polygon polygon = geometryFactory.createPolygon(rings.get(0), linearRings);
        return polygon.toText();
    }

}

这个代码使用了Jackson库来解析GeoJSON字符串，并使用JTS库来创建WKT格式的几何对象。该代码将GeoJSON中的rings数组转换为JTS的LinearRing数组，并使用这些线性环来创建一个多边形对象。最终，它返回多边形对象的WKT表示形式