java实现geojson数据与wkt格式互转_java中geojson转gdb格式

首先奉上互转工具类和依赖

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryCollection;
import com.vividsolutions.jts.geom.GeometryFactory;
import com.vividsolutions.jts.io.WKTReader;
import org.geotools.geojson.GeoJSONUtil;
import org.geotools.geojson.geom.GeometryJSON;
 
import java.io.IOException;
import java.io.Reader;
import java.io.StringWriter;
 
public class WKTutil {
    private static WKTReader reader = new WKTReader();
 
    private static final String GEO_JSON_TYPE = "GeometryCollection";
 
    private static final String WKT_TYPE = "GEOMETRYCOLLECTION";
 
    public static String wktToJson(String wkt) {
        String json = null;
        try {
            WKTReader reader = new WKTReader();
            Geometry geometry = reader.read(wkt);
            StringWriter writer = new StringWriter();
            GeometryJSON g = new GeometryJSON(20);
            g.write(geometry, writer);
            json = writer.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return json;
    }
 
    public static String jsonToWkt(JSONObject jsonObject) {
        String wkt = null;
        String type = jsonObject.getString("type");
        GeometryJSON gJson = new GeometryJSON();
        try {
            // {"geometries":[{"coordinates":[4,6],"type":"Point"},{"coordinates":[[4,6],[7,10]],"type":"LineString"}],"type":"GeometryCollection"}
            if (WKTutil.GEO_JSON_TYPE.equals(type)) {
                // 由于解析上面的json语句会出现这个geometries属性没有采用以下办法
                JSONArray geometriesArray = jsonObject.getJSONArray("geometries");
                // 定义一个数组装图形对象
                int size = geometriesArray.size();
                Geometry[] geometries = new Geometry[size];
                for (int i = 0; i < size; i++) {
                    String str = geometriesArray.get(i).toString();
                    // 使用GeoUtil去读取str
                    Reader reader = GeoJSONUtil.toReader(str);
                    Geometry geometry = gJson.read(reader);
                    geometries[i] = geometry;
                }
                GeometryCollection geometryCollection = new GeometryCollection(geometries, new GeometryFactory());
                wkt = geometryCollection.toText();
            } else {
                Reader reader = GeoJSONUtil.toReader(jsonObject.toString());
                Geometry read = gJson.read(reader);
                wkt = read.toText();
            }
 
 
        } catch (IOException e) {
            System.out.println("GeoJson转WKT出现异常");
            e.printStackTrace();
        }
        return wkt;
    }
 
}

<dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-shapefile</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-swing</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-jdbc</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.geotools.jdbc</groupId>
            <artifactId>gt-jdbc-postgis</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-epsg-hsql</artifactId>
            <version>19.2</version>
        </dependency>
        <dependency>
            <groupId>org.geotools</groupId>
            <artifactId>gt-geojson</artifactId>
            <version>12.0</version>
        </dependency>
        <dependency>
            <groupId>com.vividsolutions</groupId>
            <artifactId>jts</artifactId>
            <version>1.13</version>         <!--2-->
            <exclusions>
                <exclusion>
                    <groupId>xerces</groupId>
                    <artifactId>xercesImpl</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

下面演示通过postman请求体传geojson格式参数，Controller层接收参数并转化wkt

    @RequestMapping(value = "/text", method = RequestMethod.POST)
    public String text(@RequestBody Object geom) {
        JSONObject jsonObject = JSONObject.parseObject(JSON.toJSONString(geom));
        return WKTutil.jsonToWkt(jsonObject);
    }

参数

{
    "geom": {
        "type": "MultiPolygon",
        "coordinates": [
            [
                [
                    [
                        -122.2694982,
                        37.79045922
                    ],
                    [
                        -122.2693624,
                        37.79041125
                    ],
                    [
                        -122.2693518,
                        37.79042521
                    ],
                    [
                        -122.26899,
                        37.7902858
                    ],
                    [
                        -122.2690027,
                        37.79027181
                    ],
                    [
                        -122.2688602,
                        37.79021705
                    ],
                    [
                        -122.2687222,
                        37.790445
                    ],
                    [
                        -122.2688582,
                        37.79049813
                    ],
                    [
                        -122.2689084,
                        37.79041634
                    ],
                    [
                        -122.2689473,
                        37.79041058
                    ],
                    [
                        -122.2691974,
                        37.79051029
                    ],
                    [
                        -122.2692367,
                        37.7906097
                    ],
                    [
                        -122.2692201,
                        37.79064271
                    ],
                    [
                        -122.2693538,
                        37.79069243
                    ],
                    [
                        -122.2694982,
                        37.79045922
                    ]
                ]
            ]
        ]
    }
}