GeoJSON代码示例

GeoJSON代码示例

1. 读取GeoJSON文件

1.1 实现思路

graph TDA[读取GeoJSON文件] --> B[读取GeoJSON文件内容]B --> C[解析GeoJSON文件内容]C --> D[构建SimpleFeatureCollection]D --> E[返回SimpleFeatureCollection]

1.2 代码示例

public static SimpleFeatureCollection readGeojson(String geojsonPath){File file = new File(geojsonPath);Charset encoding = CharsetDetector.detect(file);String geojsonString = FileUtil.readString(file, encoding);GeometryJSON gjson = new GeometryJSON(16);FeatureJSON fjson = new FeatureJSON(gjson);try {SimpleFeatureType simpleFeatureType = fjson.readFeatureCollectionSchema(geojsonString, true);ListFeatureCollection featureCollection = new ListFeatureCollection(simpleFeatureType);try (FeatureIterator<SimpleFeature> features = fjson.streamFeatureCollection(geojsonString)) {while (features.hasNext()) {featureCollection.add(features.next());}}return featureCollection;} catch (IOException e) {throw new RuntimeException(e);}}

2. 写入GeoJSON文件

2.1 实现思路

graph TDA[构建图层结构] --> B[写入要素]B --> C[关闭图层]C --> D[写入编码]

2.2 代码示例

public static void writeGeojson(String geojsonPath, SimpleFeatureCollection featureCollection,Integer wkid){GeometryJSON gjson = new GeometryJSON(16);FeatureJSON fjson = new FeatureJSON(gjson);try {CoordinateReferenceSystem crs = CRS.decode("EPSG:" + wkid, true);featureCollection = new ForceCoordinateSystemFeatureResults(featureCollection, crs, false);String geojsonString = fjson.toString(featureCollection);FileUtil.writeString(geojsonString, geojsonPath, "utf-8");} catch (Exception e) {throw new RuntimeException(e);}}