怎么使用java代码将jxf格式转为geojson格式？

Java代码可以使用GeoTools库来将JXF格式转换为GeoJSON格式。以下是一个简单的示例代码：

import java.io.File;
import java.io.IOException;
import org.geotools.data.DataStore;
import org.geotools.data.DataStoreFinder;
import org.geotools.data.FeatureSource;
import org.geotools.data.FileDataStore;
import org.geotools.feature.FeatureCollection;
import org.geotools.geojson.feature.FeatureJSON;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;

public class JxfToGeoJson {

    public static void main(String[] args) {
        String inputFilePath = "input.jxf";
        String outputFilePath = "output.geojson";
        
        try {
            // Open JXF file
            File inputFile = new File(inputFilePath);
            DataStore jxfDataStore = DataStoreFinder.getDataStore(inputFile);
            String typeName = jxfDataStore.getTypeNames()[0];
            FeatureSource<SimpleFeatureType, SimpleFeature> jxfFeatureSource = jxfDataStore.getFeatureSource(typeName);
            FeatureCollection<SimpleFeatureType, SimpleFeature> jxfFeatureCollection = jxfFeatureSource.getFeatures();
            
            // Convert to GeoJSON format
            FeatureJSON featureJson = new FeatureJSON();
            String geoJson = featureJson.toString(jxfFeatureCollection);
            
            // Write to file
            File outputFile = new File(outputFilePath);
            FileUtils.writeStringToFile(outputFile, geoJson, "UTF-8");
            
            // Close resources
            jxfDataStore.dispose();
            
            System.out.println("Conversion complete.");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

在此示例中，我们首先打开JXF文件，然后将其转换为GeoJSON格式，最后将结果写入文件。我们使用GeoTools库中的FeatureJSON类来执行转换。请注意，这里使用了Apache Commons IO库中的FileUtils类来写入文件。在实际应用中，您可以根据需要进行更改。