如何使用JMapFrame添加文本并将其显示在GeoTools的地图内容上？

import org.geotools.map.MapContent;
import org.geotools.swing.JMapFrame;
import org.geotools.swing.data.JFileDataStoreChooser;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.styling.SLD;
import org.geotools.styling.Style;
import org.geotools.styling.TextSymbolizer;
import org.geotools.styling.Font;
import org.geotools.styling.AnchorPoint;
import org.geotools.styling.PointPlacement;
import org.geotools.styling.Graphic;
import org.geotools.styling.Mark;
import org.geotools.styling.StyleFactory;
import org.geotools.styling.StyleBuilder;

MapContent mapContent = new MapContent();

File file = JFileDataStoreChooser.showOpenFile("shp", null);
if (file == null) {
    return;
}
FileDataStore store = FileDataStoreFinder.getDataStore(file);
SimpleFeatureSource featureSource = store.getFeatureSource();
mapContent.addLayer(featureSource, style);

StyleFactory styleFactory = CommonFactoryFinder.getStyleFactory();
StyleBuilder styleBuilder = new StyleBuilder(styleFactory);
Font font = styleBuilder.createFont("Arial", 12);
TextSymbolizer textSymbolizer = styleBuilder.createTextSymbolizer(Color.BLACK, font, "name");

AnchorPoint anchorPoint = styleBuilder.createAnchorPoint(0.5, 0.5);
PointPlacement pointPlacement = styleBuilder.createPointPlacement(anchorPoint, 0, 0, 0);
Graphic graphic = styleBuilder.createGraphic(null, pointPlacement, null, null);
Mark mark = styleBuilder.createMark("circle", Color.RED);
graphic.graphicalSymbols().clear();
graphic.graphicalSymbols().add(mark);
textSymbolizer.setGraphic(graphic);

Style style = SLD.createSimpleStyle(featureSource.getSchema(), Color.LIGHT_GRAY);
style.featureTypeStyles().get(0).rules().get(0).symbolizers().add(textSymbolizer);

JMapFrame mapFrame = new JMapFrame(mapContent);
mapFrame.setSize(800, 600);
mapFrame.setVisible(true);