Java GeoJSON如何转换为其他格式

Java GeoJSON可以转换为其他格式，如Shapefile、KML、GeoRSS等。以下是一种将GeoJSON转换为Shapefile的方法：

1. 首先，您需要使用Java库来读取和处理GeoJSON数据。一个常用的库是GeoTools，它提供了用于处理地理空间数据的各种工具和功能。您可以在Maven中添加以下依赖项来引入GeoTools库：

<dependency>
    <groupId>org.geotools</groupId>
    <artifactId>gt-main</artifactId>
    <version>22.3</version>
</dependency>

2. 接下来，您需要编写Java代码来读取GeoJSON文件并将其转换为FeatureCollection对象。以下是一个示例代码片段：

import org.geotools.feature.FeatureCollection;
import org.geotools.geojson.feature.FeatureJSON;

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

public class GeoJSONToShapefileConverter {

    public static void main(String[] args) throws IOException {
        File geoJSONFile = new File("path/to/geojson/file.geojson");

        FileInputStream fis = new FileInputStream(geoJSONFile);
        FeatureJSON featureJSON = new FeatureJSON();
        FeatureCollection featureCollection = featureJSON.readFeatureCollection(fis);

        // Convert FeatureCollection to Shapefile
        // TODO: add code to convert FeatureCollection to Shapefile
    }
}

3. 最后，您需要编写代码来将FeatureCollection对象转换为Shapefile。您可以使用GeoTools库中的工具来实现这一点。以下是一个示例代码片段：

import org.geotools.data.FileDataStore;
import org.geotools.data.FileDataStoreFinder;
import org.geotools.data.shapefile.ShapefileDataStore;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.geotools.geojson.feature.FeatureJSON;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class GeoJSONToShapefileConverter {

    public static void main(String[] args) throws IOException {
        File geoJSONFile = new File("path/to/geojson/file.geojson");

        FileInputStream fis = new FileInputStream(geoJSONFile);
        FeatureJSON featureJSON = new FeatureJSON();
        FeatureCollection featureCollection = featureJSON.readFeatureCollection(fis);

        File shapefile = new File("path/to/output/shapefile.shp");
        Map<String, Object> params = new HashMap<>();
        params.put(ShapefileDataStoreFactory.URLP.key, shapefile.toURI().toURL());
        ShapefileDataStore dataStore = (ShapefileDataStore) DataStoreFinder.getDataStore(params);

        SimpleFeatureType featureType = featureCollection.getSchema();
        dataStore.createSchema(featureType);

        FeatureIterator<SimpleFeature> iterator = featureCollection.features();
        while (iterator.hasNext()) {
            SimpleFeature feature = iterator.next();
            dataStore.addFeature(feature);
        }
        iterator.close();
    }
}

通过以上步骤，您可以将Java GeoJSON转换为Shapefile格式。您可以根据需要进行调整和修改以适应不同的转换需求。