JMapframe displays only a single shapefile - netbeans

Question

I used the Netbeans and GeoTools to program a graphical interface to display multiple shapefiles in the same JmapFrame. I used the following code but I do not know, when execute, it display only one shapefile.Svp, someone can help me, I await your answers.
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import java.io.File;
import org.geotools.data.FeatureSource;
import org.geotools.data.FileDataStore;
import org.geotools.data.FileDataStoreFinder;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.map.DefaultMapContext;
import org.geotools.map.MapContext;
import org.geotools.swing.JMapFrame;
import org.geotools.swing.data.JFileDataStoreChooser;
import org.opengis.feature.simple.SimpleFeature;
/**
*
* #author Brahim
*/
class ImportVecteur2
{
private JMapFrame fenMap;
private MapContext mapContext;
ImportVecteur2(JMapFrame fenMap)
{
//this.mapContext = mapContext;
this.fenMap = fenMap;
}
#SuppressWarnings("static-access")
public void chercheAfficheVecteur() //throws Exception
{
try
{
File file = JFileDataStoreChooser.showOpenFile("shp", null);
if (file == null)
{
return;
}
FileDataStore store = FileDataStoreFinder.getDataStore(file);
FeatureSource featureSource = store.getFeatureSource();
//get vertices of file
// Create a map context and add our shapefile to it
mapContext = new DefaultMapContext();
mapContext.addLayer(featureSource, null);
// Now display the map
fenMap.enableLayerTable(true);
fenMap.setMapContext(mapContext);
fenMap.setVisible(true);
}

Answer 1

Each time you call chercheAfficheVecteur you create a new MapContext so the previous one is thrown away and with it your previous shapefile. If you change the method to be
public void chercheAfficheVecteur() {
try {
File file = JFileDataStoreChooser.showOpenFile("shp", null);
if (file == null) {
return;
}
FileDataStore store = FileDataStoreFinder.getDataStore(file);
FeatureSource featureSource = store.getFeatureSource();
//get vertices of file
// Create a map context and add our shapefile to it
if(mapContext == null){
mapContext = new DefaultMapContext();
fenMap.setMapContext(mapContext);
}
//make it look prettier
Style style = SLD.createSimpleStyle(featureSource.getSchema());
mapContext.addLayer(featureSource, style);
}
and
ImportVecteur2(JMapFrame fenMap)
{
//this.mapContext = mapContext;
this.fenMap = fenMap;
fenMap.enableLayerTable(true);
fenMap.setVisible(true);
}
It should work better.
After further testing (i.e. I actually compiled some code) - MapContext is deprecated (and has been for some time) please use MapContent.
package org.geotools.tutorial.quickstart;
import java.awt.Color;
import java.awt.Dimension;
import java.io.File;
import java.io.IOException;
import org.geotools.data.FeatureSource;
import org.geotools.data.FileDataStore;
import org.geotools.data.FileDataStoreFinder;
import org.geotools.map.FeatureLayer;
import org.geotools.map.Layer;
import org.geotools.map.MapContent;
import org.geotools.styling.SLD;
import org.geotools.styling.Style;
import org.geotools.swing.JMapFrame;
import org.geotools.swing.data.JFileDataStoreChooser;
public class Test {
private static final Color[] color = { Color.red, Color.blue, Color.green,
Color.MAGENTA };
private static MapContent mapContext;
private static JMapFrame fenMap;
public static void main(String args[]) throws IOException {
Test me = new Test();
me.run();
}
public void run() throws IOException {
fenMap = new JMapFrame();
mapContext = new MapContent();
fenMap.setMapContent(mapContext);
fenMap.enableToolBar(true);
fenMap.setMinimumSize(new Dimension(300, 300));
fenMap.setVisible(true);
int i = 0;
while (chercheAfficheVecteur(i)) {
i++;
i = i % color.length;
}
}
public boolean chercheAfficheVecteur(int next) throws IOException {
File file = JFileDataStoreChooser.showOpenFile("shp", null);
if (file == null) {
return false;
}
FileDataStore store = FileDataStoreFinder.getDataStore(file);
FeatureSource featureSource = store.getFeatureSource();
// get vertices of file
// Create a map context and add our shapefile to it
if (mapContext == null) {
}
// make it look prettier
Style style = SLD.createSimpleStyle(featureSource.getSchema(), color[next]);
Layer layer = new FeatureLayer(featureSource, style);
mapContext.addLayer(layer);
return true;
}
}