Java 判断坐标是否存在于geojson中

可以使用 GeoTools 库来实现 Java 判断坐标是否存在于 GeoJSON 中。

首先，需要将 GeoJSON 转换为 FeatureCollection，然后遍历其中的 Feature 对象，判断目标坐标是否在 Feature 中。

示例代码如下：

import org.geotools.data.geojson.GeoJSONDataStore;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.geojson.feature.FeatureJSON;
import org.locationtech.jts.geom.Coordinate;
import org.locationtech.jts.geom.Geometry;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class GeoJSONUtil {

    public static boolean containsCoordinate(File geojsonFile, Coordinate coordinate) throws IOException {
        GeoJSONDataStore dataStore = new GeoJSONDataStore(geojsonFile.toURI().toURL());
        SimpleFeatureType featureType = dataStore.getSchema();
        SimpleFeatureCollection featureCollection = dataStore.getFeatureSource(featureType.getTypeName()).getFeatures();
        SimpleFeatureIterator featureIterator = featureCollection.features();
        boolean contains = false;
        try {
            while (featureIterator.hasNext()) {
                SimpleFeature feature = featureIterator.next();
                Geometry geometry = (Geometry) feature.getDefaultGeometry();
                if (geometry.contains(geometry.getFactory().createPoint(coordinate))) {
                    contains = true;
                    break;
                }
            }
        } finally {
            featureIterator.close();
        }
        return contains;
    }

}

其中，参数 `geojsonFile` 是 GeoJSON 文件，`coordinate` 是目标坐标。该方法返回一个布尔值，表示目标坐标是否存在于 GeoJSON 中。

使用示例：

File geojsonFile = new File("path/to/geojson/file");
Coordinate coordinate = new Coordinate(x, y);
boolean contains = GeoJSONUtil.containsCoordinate(geojsonFile, coordinate);
if (contains) {
    System.out.println("目标坐标存在于 GeoJSON 中");
} else {
    System.out.println("目标坐标不存在于 GeoJSON 中");
}