一个Applet实例的问题

楼主^#

更多发布于：2006-10-23 13:05

刚接触GIS，迷茫滴很！
一个网上的Applet实例。
环境变量中，我将 C:\j2sdk1.4.2\lib\tools.jar; C:\Tomcat 5.0\common\lib\servlet-api.jar; C:\Tomcat 5.\common\lib\mxj.jar; E:\gis\miutil.jar; E:\gis\mxj.jar; C:\Tomcat 5.0\common\lib\commons-logging.jar;. 都放置在了classpath中 程序在E:\gis下放置。机器上未安装MapXtreme For Java，只将mapxtreme471和mapviewer471文件夹放置在C:\Tomcat 5.0\webapps中。
程序如下：
import java.net.*; import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.InputStream; import java.io.ByteArrayOutputStream; import java.util.List;
import com.mapinfo.graphics.Rendition; import com.mapinfo.graphics.*; import com.mapinfo.graphics.RenditionImpl; import com.mapinfo.theme.OverrideTheme; import com.mapinfo.theme.ThemeList; import com.mapinfo.xmlprot.MapImageResponse; import com.mapinfo.mapxtreme.client.*; import com.mapinfo.util.Overlay; import com.mapinfo.mapj.*; import com.mapinfo.mapj.MapJ; import com.mapinfo.xmlprot.mxtj.*; import org.jdom.*;//该包存在于jdom.jar
/**This class is an example of how to use the EncodedImageRenderer and Overlay classes * to draw animated gifs on a Map in an application.*/ public class AnimatedApp extends JFrame{ /** Image to draw map on. */ public Image m_mapImage = null; /** Image to draw symbols. */ public Image m_symbolImage = null; /** Map state. */ public MapJ m_mapJ= null; /** Zoom buttons to change map. */ public JButton inButton = new JButton("Zoom In"); public JButton outButton = new JButton("Zoom Out"); /** URL path to MDF. mdf文件的路径 */ public String m_fileToLoad = "<a href="http://localhost:8080/mapdemo/maps/CHINA.mdf" target="_blank" >http://localhost:8080/mapdemo/maps/CHINA.mdf</A>"; /** URL path to MXTJ Servlet. MapXtremeJava的路径 */ public String m_mxtjURL = "<a href="http://localhost:8080/mapxtreme471/servlet/mapxtreme" target="_blank" >http://localhost:8080/mapxtreme471/servlet/mapxtreme</A>"; /** URL path to symbol to draw. 绘制图形的路径 */ public String m_symbolUrl ="<a href="http://localhost:8080/samples45/ColorStar.gif" target="_blank" >http://localhost:8080/samples45/ColorStar.gif</A>"; /** List of Overlay objects to draw on map. */ public List m_overlays = null;
 public AnimatedApp(){} 
 public static void main (String args[]){ AnimatedApp app = new AnimatedApp(); app.initApp(); System.out.println("456"); }
 /**Initializes the GUI and map.*/ public void initApp(){ try{ this.setSize(700,500); InputStream isRemoteFile = null; m_mapJ = new MapJ(); URL u = new URL(m_fileToLoad); 
 URLConnection conn = u.openConnection(); 
 isRemoteFile = conn.getInputStream(); // Load the map m_mapJ.loadMapDefinition(isRemoteFile); m_mapJ.loadMapDefinition(m_fileToLoad); //inner member class to draw the Map MapComponent map = new MapComponent(); map.setBackground(Color.blue); //this button will zoom in inButton.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed (java.awt.event.ActionEvent e){ try{ m_mapJ.setZoom(m_mapJ.getZoom()/2.0); renderMap(); }catch (Exception ex) { System.out.println("Exception in button "); ex.printStackTrace(); } } }); //this button will zoom out outButton.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed (java.awt.event.ActionEvent e){ try{ m_mapJ.setZoom(m_mapJ.getZoom()*2.0); renderMap(); }catch (Exception ex) { System.out.println("Exception in button "); ex.printStackTrace(); } } }); //load image to draw on map getImage(); //apply Override theme with Overlays applyOverrideTheme(); //render the initial Map renderMap(); //build the GUI BorderLayout bl = new BorderLayout(); getContentPane().setLayout(bl); getContentPane().add(inButton, bl.NORTH); getContentPane().add(outButton, bl.SOUTH); getContentPane().add(map,bl.CENTER);
 this.show(); } catch (Exception e){ System.out.println("Exception in init "); e.printStackTrace(); }// end catch } // end of Init
 /**Set the symbol Image.For OverrideTheme, this is only done once.*/ public void getImage(){ ByteArrayOutputStream baos = new ByteArrayOutputStream(); try{ URL url = new URL(m_symbolUrl); InputStream is = url.openStream(); byte [] ba = new byte[1]; while ((is.read(ba,0,1))!=(-1)){ baos.write(ba[0]); } // Image m_symbolImage m_symbolImage的变量类型Image m_symbolImage = Toolkit.getDefaultToolkit().createImage(baos.toByteArray()); MediaTracker tracker = new MediaTracker(this); 
 tracker.addImage(m_symbolImage,1); 
 tracker.waitForAll(); }catch (Exception ex) { ex.printStackTrace(); } }
 /**Create an OverrideTheme on the 0th layer.sets the Rendition as an Overlay.*/ public void applyOverrideTheme(){ Layer l = m_mapJ.getLayers().elementAt(0); 
 ThemeList tl = l.getThemeList(); tl.removeAll(); // Removes all themes from the list. Rendition rendition = new RenditionImpl();
 // Sets the value for the specified rendition property. rendition.setValue(Rendition.SYMBOL_MODE, Rendition.SymbolMode.OVERLAY_IMAGE);
 // Specify the location of the Overlay image (animated gif in this example) to use rendition.setValue(Rendition.SYMBOL_URL, m_symbolUrl);
 // Create an OverrideTheme on the "World Capitals" layer using the above rendition OverrideTheme ovrTheme = new OverrideTheme(rendition, "AnimatedImages"); l.getThemeList().add(ovrTheme); } 
/**render the Map using the EncodedImageRenderer 使用EncodedImageRenderer来渲染地图 */ public void renderMap(){ try{ // Create the ImageRequestComposer ImageRequestComposer imageRC = ImageRequestComposer.create( m_mapJ,ImageRequestComposer.MAX_COLORS_TRUECOLOR, Color.blue, "image/gif"); //render using EncodedImageRenderer creating a gif image EncodedImageRenderer renderer = new EncodedImageRenderer(m_mxtjURL); String mimeType = renderer.createMimeType("image/gif"); ImageRequestComposer irc = ImageRequestComposer.create( m_mapJ,ImageRequestComposer.MAX_COLORS_TRUECOLOR, Color.blue, mimeType);
 renderer.render(irc);
 //get the map image bytes out of the response
 MapImageResponse response = renderer.getResponse(); byte[] m_imageBytes = response.getEncodedImage();
 //create Image object from bytes Toolkit kit = Toolkit.getDefaultToolkit(); m_mapImage = kit.createImage(m_imageBytes); MediaTracker tracker = new MediaTracker(this); tracker.addImage(m_mapImage,1); tracker.waitForAll();
 //get the Overlays from response m_overlays = response.getOverlayList();
 repaint(); }catch (Exception ex) { System.out.println("Exception in renderMap "); ex.printStackTrace(); } }
 /**Inner class that paints the map image to a JComponent. 内类用JComponent绘制地图图像*/ public class MapComponent extends JComponent{ /**Overridden paint method to draw the map,then draw the Overlay images on top. <a href="mailt*@param" target="_blank" >*@param</A> Graphics the graphics object to draw to.*/ public void paint (Graphics g){ if (m_mapImage!=null){ g.drawImage(m_mapImage, 0, 0, this ); try{ //put the symbol in the correct location for (int loop = 0; loop < m_overlays.size(); loop++){ // get the Overlay object from the List, then get it's Point Overlay overlayImage = (Overlay) m_overlays.get(loop); 
 com.mapinfo.util.DoublePoint point = overlayImage.getPoint(); g.drawImage(m_symbolImage, (int)point.x, (int)point.y, this); } }catch (Exception e) { e.printStackTrace(); } }else{ System.out.println("paint: Image null "); } } //end paint } //end inner class
 /**Overridden so we can exit when window is closed */ protected void processWindowEvent(WindowEvent e){ super.processWindowEvent(e); if (e.getID() == WindowEvent.WINDOW_CLOSING){ System.exit(0); } } //processWindowEvent函数结束 } //AnimatedApp类结束
在编译时，这时很多和MapXtreme For Java有关的类都未找到，我又将提示未找到的类放置在E:\gis\com\mapinfo下（即我解压缩了miutil.jar和mxj.jar） 再编译顺利通过，但出现过时的类的提示： Note: AnimatedApp.java uses or overrides a deprecated API. Note: Recompile with -deprecation for details. 未在意，继续运行，运行时不断提出错误，有时是找不到类，有时是文件地址不正确。
在一台LINUX系统的机器上，运行成功，GUI组件完全显示，但在组件中未能显示地图。
程序中的 /** URL path to symbol to draw. 绘制图形的路径 */ public String m_symbolUrl ="<a href="http://localhost:8080/samples45/ColorStar.gif" target="_blank" >http://localhost:8080/samples45/ColorStar.gif</A>"; 我不太理解它的作用，C:\Tomcat 5.0\webapps中我未创建samples45文件夹以及ColorStar.gif。这个是不是输入的文件？如果想将让该程序输出本地硬盘上的地图显示于这个程序中，该怎样修改？

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一个Applet实例的问题

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