Geotools例子2 扩展，解析geojson文件保存为shp

 

前言

相关描述可参考Geotools例子2，解析csv文件保存为shp，这里直接贴出代码

实现

import org.geotools.data.DataUtilities;
import org.geotools.data.DefaultTransaction;
import org.geotools.data.Transaction;
import org.geotools.data.collection.ListFeatureCollection;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.data.shapefile.ShapefileDataStoreFactory;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.data.simple.SimpleFeatureStore;
import org.geotools.feature.SchemaException;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.geometry.jts.JTSFactoryFinder;
import org.geotools.swing.data.JFileDataStoreChooser;
import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.CoordinateSequence;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.geom.Polygon;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;

import javax.json.*;
import javax.json.stream.JsonParser;
import java.io.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


public class GeoJSON {
    public static void main(String[] args){
        File file = new File("src/main/resources/anhui.json");
        try(BufferedReader reader = new BufferedReader(new FileReader(file))){
            StringBuilder str = new StringBuilder("");
            String line = "";
            for(line = reader.readLine(); line != null; line=reader.readLine()){
                str.append(line);
            }
            // 创建要素类型FeatureType
            final SimpleFeatureType TYPE =
                    DataUtilities.createType(
                            "Province",
                            "the_geom:Polygon:srid=4326,"
                                    + // <- the geometry attribute: Point type
                                    "name:String,"
                                    + // <- a String attribute
                                    "number:Integer" // a number attribute
                    );
            List<SimpleFeature> features = new ArrayList<SimpleFeature>();
            GeometryFactory geometryFactory = JTSFactoryFinder.getGeometryFactory();
            SimpleFeatureBuilder featureBuilder = new SimpleFeatureBuilder(TYPE);
            /**
             * 解析JSON格式数据
             */
            JsonReader jsonReader = Json.createReader(new StringReader(str.toString()));
            JsonObject jsonObj = jsonReader.readObject();
            JsonObject geometry = jsonObj.getJsonArray("features").getJsonObject(0).getJsonObject("geometry");

            // 获取geometry类型和坐标
            String type = geometry.getString("type");
            JsonArray coordinates = geometry.getJsonArray("coordinates").getJsonArray(0);

            ArrayList<Coordinate> list = new ArrayList<Coordinate>();
//            Coordinate[] list = new Coordinate[200];
            for(JsonValue obj : coordinates){
                String[] objArray = obj.toString().split(",");
                // 经纬度
                String latitude = objArray[0].substring(1);
                String longitude = objArray[1].substring(0, objArray[1].length() - 1);
                list.add(new Coordinate(Double.parseDouble(longitude), Double.parseDouble(latitude)));
            }

            // 转换ArrayList为Coordinate[]
            Coordinate coordinateList[] = new Coordinate[list.toArray().length];
            for(int i = 0; i < coordinateList.length; i++){
                coordinateList[i] = (Coordinate) list.toArray()[i];
            }

            Polygon polygon = geometryFactory.createPolygon(coordinateList);

            // 生成要素
            featureBuilder.add(polygon);
            SimpleFeature feature = featureBuilder.buildFeature(null);
            features.add(feature);

            // 选择shp文件保存路径
            JFileDataStoreChooser chooser = new JFileDataStoreChooser("shp");
            chooser.setDialogTitle("Save shapefile");

            int returnVal = chooser.showSaveDialog(null);

            if (returnVal != JFileDataStoreChooser.APPROVE_OPTION) {
                // the user cancelled the dialog
                System.exit(0);
            }

            File newFile = chooser.getSelectedFile();

            ShapefileDataStoreFactory dataStoreFactory = new ShapefileDataStoreFactory();

            Map<String, Serializable> params = new HashMap<>();
            params.put("url", newFile.toURI().toURL());
            params.put("create spatial index", Boolean.TRUE);

            ShapefileDataStore newDataStore =
                    (ShapefileDataStore) dataStoreFactory.createNewDataStore(params);

            // 定义数据存储要素类型
            newDataStore.createSchema(TYPE);

            // FeatureStore事务控制，这里是创建
            Transaction transaction = new DefaultTransaction("create");

            String typeName = newDataStore.getTypeNames()[0]; // points

            // 要素源
            SimpleFeatureSource featureSource = newDataStore.getFeatureSource(typeName);

            if (featureSource instanceof SimpleFeatureStore) {
                SimpleFeatureStore featureStore = (SimpleFeatureStore) featureSource;
                /*
                 * SimpleFeatureStore has a method to add features from a
                 * SimpleFeatureCollection object, so we use the ListFeatureCollection
                 * class to wrap our list of features.
                 */
                SimpleFeatureCollection collection = new ListFeatureCollection(TYPE, features);
                featureStore.setTransaction(transaction);
                try {
                    featureStore.addFeatures(collection);
                    transaction.commit();
                } catch (Exception problem) {
                    problem.printStackTrace();
                    transaction.rollback();
                } finally {
                    transaction.close();
                }
                System.exit(0); // success!
            } else {
                System.out.println(typeName + " does not support read/write access");
                System.exit(1);
            }


        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (SchemaException e) {
            e.printStackTrace();
        }
    }
}