applet打包

摘要: applet打包

</td> </tr> <tr> <td width="517" height="35" valign="top" class="ArticleTeitle"> 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：

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;
}
}
}

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