Go语言视频零基础入门到精通

javalearner

写Applet时，图像和其它资源文件要用如下方法载入：

         ClassLoader loader=this.getClass().getClassLoader();
         //image = this.getImage(this.getDocumentBase(), this.getParameter("image"));
         image = this.getImage(loader.getResource(getParameter("image")));
  

  
  
第一步：编译源文件

C:java>javac    Soundmap.java

第二步：打包
C:java>jar cf applet.jar java_parts.gif chirp.au chen/applet

第三步：编写HTML文件（源文件请下载）
主要部分：
<APPLET code="chen/applet/Soundmap.class"
arcHive="applet.jar"  width=288 height=191>
   <PARAM name="image" value="java_parts.gif">
   <PARAM name="sound" value="chirp.au">
   <PARAM name="rect0" value="114,90,151,33,#p1">
   <PARAM name="rect1" value="114,123,151,33,#p2">
   <PARAM name="rect2" value="114,156,151,33,#p3">
</APPLET>
  
  
   
   
     
   

   
   
  

下面是applet的源程序:（来自java实例）
/*
  * Copyright (c) 2000 David Flanagan.  All rights reserved.
  * This code is from the book Java Examples in a Nutshell, 2nd Edition.
  * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
  * You may study, use, and modify it for any non-commercial purpose.
  * You may distribute it non-commercially as long as you retain this notice.
  * For a commercial use license, or to purchase the book (recommended),
  * visit http://www.davidflanagan.com/javaexamples2.
  */
package chen.applet;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.util.*;

/**
  * A Java applet that simulates a client-side imagemap.
  * Plays a sound whenever the user clicks on one of the hyperlinks.
  */
public class Soundmap extends Applet implements MouseListener {
     protected Image image;     // The image to display.
     protected Vector rects;    // A list of rectangles in it.
     protected AudioClip sound; // A sound to play on user clicks in a rectangle
     protected ImagemapRectangle highlight; // Which rectangle is highlighted

     /** Initialize the applet */
     public void init() {
         // Look up the name of the image, relative to a base URL, and load it.
         // Note the use of three Applet methods in this one line.
         ClassLoader loader=this.getClass().getClassLoader();

         //image = this.getImage(this.getDocumentBase(), this.getParameter("image"));
         image = this.getImage(loader.getResource(getParameter("image")));
         // Lookup and parse a list of rectangular areas and their URLs.
         // The convenience routine getRectangleParameter() is defined below.
         rects = new Vector();
         ImagemapRectangle r;
         for(int i = 0; (r = getRectangleParameter("rect" + i)) != null; i++)
             rects.addElement(r);

         // Look up a sound to play when the user clicks one of those areas.
         sound = this.getAudioClip(loader.getResource(getParameter("sound")));   

         // Specify an "event listener" object to respond to mouse button
         // presses and releases.  Note that this is the Java 1.1 event model.
         this.addMouseListener(this);
     }

     /**
      * Called when the applet is being unloaded from the system.
      * We use it here to "flush" the image we no longer need. This may
      * result in memory and other resources being freed more quickly.
      **/
     public void destroy() { image.flush(); }

     /**
      * To display the applet, we simply draw the image, and highlight the
      * current rectangle if any.
      **/
     public void paint(Graphics g) {
g.drawImage(image, 0, 0, this);
if (highlight != null) {
     g.setColor(Color.red);
     g.drawRect(highlight.x, highlight.y,
        highlight.width, highlight.height);
     g.drawRect(highlight.x+1, highlight.y+1,
        highlight.width-2, highlight.height-2);
}
     }

     /**
      * We override this method so that it doesn"t clear the background
      * before calling paint().  No clear is necessary, since paint() overwrites
      * everything with an image.  Causes less flickering this way.
      **/
     public void update(Graphics g) { paint(g); }

     /**
      * Parse a comma-separated list of rectangle coordinates and a URL.
      * Used to read the imagemap rectangle definitions from applet parameters
      **/
     protected ImagemapRectangle getRectangleParameter(String name) {
         int x, y, w, h;
         URL url;
         String value = this.getParameter(name);
         if (value == null) return null;

         try {
             StringTokenizer st = new StringTokenizer(value, ",");
             x = Integer.parseInt(st.nextToken());
             y = Integer.parseInt(st.nextToken());
             w = Integer.parseInt(st.nextToken());
             h = Integer.parseInt(st.nextToken());
             url = new URL(this.getDocumentBase(), st.nextToken());
         }
         catch (NoSuchElementException e) { return null; }
         catch (NumberFormatException e) { return null; }
         catch (MalformedURLException e) { return null; }

         return new ImagemapRectangle(x, y, w, h, url);
     }

     /** Called when a mouse button is pressed. */
     public void mousePressed(MouseEvent e) {
// On button down, check if we"re inside one of the rectangles.
// If so, highlight the rectangle, display a message, and play a sound.
// The utility routine findrect() is defined below.
ImagemapRectangle r = findrect(e);
// If a rectangle is found, and is not already highlighted
if (r != null && r != highlight) {
     highlight = r;                // Remember which rectangle it is
     showStatus("To: " + r.url);   // display its URL in status line
     sound.play();                 // play the sound
     repaint();                    // request a redraw to highlight it
}
     }

     /** Called when a mouse button is released. */
     public void mouseReleased(MouseEvent e) {
// If the user releases the mouse button over a highlighted
// rectangle, tell the browser to display its URL.  Also,
// erase the highlight and clear status
if (highlight != null) {
     ImagemapRectangle r = findrect(e);
     if (r == highlight)  getAppletContext().showDocument(r.url);
     showStatus("");     // clear the message.
     highlight = null;   // forget the highlight
     repaint();          // request a redraw
}
     }

     /** Unused methods of the MouseListener interface */
     public void mouseEntered(MouseEvent e) {}
     public void mouseExited(MouseEvent e) {}
     public void mouseClicked(MouseEvent e) {}

     /** Find the rectangle we"re inside. */
     protected ImagemapRectangle findrect(MouseEvent e) {
int i, x = e.getX(), y = e.getY();
for(i = 0; i < rects.size(); i++)  {
     ImagemapRectangle r = (ImagemapRectangle) rects.elementAt(i);
     if (r.contains(x, y)) return r;
}
return null;
     }

     /**
      * A helper class.  Just like java.awt.Rectangle, but with a URL field.
      * Note the use of a nested toplevel class for neatness.
      **/
     static class ImagemapRectangle extends Rectangle {
         URL url;
         public ImagemapRectangle(int x, int y, int w, int h, URL url) {
             super(x, y, w, h);
             this.url = url;
         }
     }
}  

  



                        function TempSave(ElementID)
                        {
                                CommentsPersistDiv.setAttribute("CommentContent",document.getElementById(ElementID).value);
                                CommentsPersistDiv.save("CommentXMLStore");
                        }
                        function Restore(ElementID)
                        {
                                CommentsPersistDiv.load("CommentXMLStore");
                                document.getElementById(ElementID).value=CommentsPersistDiv.getAttribute("CommentContent");
                        }
               
                  











源码下载：http://file.javaxxz.com/2014/9/30/234754391.zip