[求助]关于JAVA显示.shp格式的地图。。

我有一张.shp格式的地图里面有几十个点，可是我在JAVA里面显示时只能显示一个点，是什么原因呢？请大家指点一下，谢谢！

帮顶<img src="images/post/smile/dvbbs/em08.gif" />

<P>学习了!!</P>
<P>我正要做j2ee结构的webgis 现在也在学习 </P>
<P>我参考的是 Topmap 组件 在Topmap中shp格式的是可以直接读取的</P>
<P>我还没有时间研究里面的机制是如何读取的</P>
<P> 帮顶 </P><img src="images/post/smile/dvbbs/em08.gif" />

<P>以下代码来自于GeoTools示例程序：</P>
<P>import java.awt.BorderLayout;<BR>import java.awt.Container;<BR>import java.io.File;<BR>import java.net.MalformedURLException;<BR>import java.net.URL;</P>
<P>import javax.swing.Action;<BR>import javax.swing.JFrame;<BR>import javax.swing.JScrollPane;<BR>import javax.swing.JToolBar;</P>
<P>import org.geotools.data.FeatureSource;<BR>import org.geotools.data.shapefile.ShapefileDataStore;<BR>import org.geotools.gui.swing.JMapPane;<BR>import org.geotools.gui.swing.PanAction;<BR>import org.geotools.gui.swing.ResetAction;<BR>import org.geotools.gui.swing.SelectAction;<BR>import org.geotools.gui.swing.ZoomInAction;<BR>import org.geotools.gui.swing.ZoomOutAction;<BR>import org.geotools.map.DefaultMapContext;<BR>import org.geotools.map.MapContext;<BR>import org.geotools.referencing.crs.DefaultGeographicCRS;<BR>import org.geotools.renderer.GTRenderer;<BR>import org.geotools.renderer.lite.StreamingRenderer;<BR>import org.geotools.styling.SLDParser;<BR>import org.geotools.styling.Style;<BR>import org.geotools.styling.StyleFactory;<BR>import org.geotools.styling.StyleFactoryFinder;</P>
<P>import com.vividsolutions.jts.geom.Envelope;</P>
<P><BR>public class JMapPaneDemo extends JFrame {<BR> <BR> private static final long serialVersionUID = 1L;<BR> <BR> private JToolBar toolBar = new JToolBar();<BR> private JMapPane mapPane = new JMapPane();<BR> <BR> public JMapPaneDemo() {<BR>  Container contentPane = getContentPane();<BR>  contentPane.setLayout(new BorderLayout());<BR>  <BR>  contentPane.add(toolBar, BorderLayout.NORTH);  <BR>  contentPane.add(mapPane, BorderLayout.CENTER);<BR>  <BR>  Action zoomIn = new ZoomInAction(mapPane);<BR>  Action zoomOut = new ZoomOutAction(mapPane);<BR>  Action pan = new PanAction(mapPane);<BR>  Action select = new SelectAction(mapPane);<BR>  Action reset = new ResetAction(mapPane);<BR>  toolBar.add(zoomIn);<BR>  toolBar.add(zoomOut);<BR>  toolBar.add(pan);<BR>  toolBar.add(select);<BR>  toolBar.add(reset);<BR>  <BR>  setBounds(20, 20, 600, 400);<BR>  setVisible(true);<BR> }<BR> <BR> public void load(URL shapefile, URL sld)throws Exception {<BR>  ShapefileDataStore shapefileDataStore = new ShapefileDataStore(shapefile);<BR>  FeatureSource featureSource = shapefileDataStore.getFeatureSource();<BR>  Envelope mapArea = featureSource.getBounds();<BR>  mapPane.setMapArea(mapArea);<BR>  <BR>  StyleFactory styleFactory = StyleFactoryFinder.createStyleFactory();<BR>  SLDParser sldParser = new SLDParser(styleFactory, sld);<BR>  Style[] styles = sldParser.readXML();<BR>  <BR>  MapContext mapContext = new DefaultMapContext(DefaultGeographicCRS.WGS84);<BR>  mapContext.addLayer(featureSource, styles[0]);<BR>  mapContext.getLayerBounds();<BR>  mapPane.setHighlightLayer(mapContext.getLayer(0));<BR>  <BR>  GTRenderer gtRenderer;<BR>  gtRenderer = new StreamingRenderer();<BR>  mapPane.setRenderer(gtRenderer);<BR>  mapPane.setContext(mapContext);<BR>  <BR>  repaint();<BR> }<BR> <BR> public static void main(String[] args) {<BR>  JMapPaneDemo application = new JMapPaneDemo();<BR>  application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);<BR>  <BR>  File shapefile = new File("countries.shp");<BR>  File sld = new File("countries.sld");<BR>  URL shapefileURL = null;<BR>  URL sldURL = null;<BR>  try {<BR>   shapefileURL = shapefile.toURL();<BR>   sldURL = sld.toURL();<BR>  } catch (MalformedURLException e) {<BR>   e.printStackTrace();<BR>  }<BR>  try {<BR>   application.load(shapefileURL, sldURL);<BR>  } catch (Exception e) {<BR>   e.printStackTrace();<BR>  }<BR> }<BR>}<BR></P>