吴裕雄--天生自然 JAVA开发学习：Applet 基础

import java.applet.*;

import java.awt.*;

public class HelloWorldApplet extends Applet

{

   public void paint (Graphics g)

   {

      g.drawString ("Hello World", 25, 50);

   }

}

<html>

<title>The Hello, World Applet</title>

<hr>

<applet code="HelloWorldApplet.class" width="320" height="120">

If your browser was Java-enabled, a "Hello, World"

message would appear here.

</applet>

<hr>

</html>

<applet codebase="http://amrood.com/applets"

code="HelloWorldApplet.class" width="320" height="120">

<applet code="mypackage.subpackage.TestApplet.class"

           width="320" height="120">

import java.applet.*;

import java.awt.*;

public class CheckerApplet extends Applet

{

   int squareSize = 50;// 初始化默认大小

   public void init () {}

   private void parseSquareSize (String param) {}

   private Color parseColor (String param) {}

   public void paint (Graphics g) {}

}

public void init ()

{

   String squareSizeParam = getParameter ("squareSize");

   parseSquareSize (squareSizeParam);

   String colorParam = getParameter ("color");

   Color fg = parseColor (colorParam);

   setBackground (Color.black);

   setForeground (fg);

}

private void parseSquareSize (String param)

{

   if (param == null) return;

   try {

      squareSize = Integer.parseInt (param);

   }

   catch (Exception e) {

     // 保留默认值

   }

}

<html>

<title>Checkerboard Applet</title>

<hr>

<applet code="CheckerApplet.class" width="480" height="320">

<param name="color" value="blue">

<param name="squaresize" value="30">

</applet>

<hr>

</html>

import java.awt.event.MouseListener;

import java.awt.event.MouseEvent;

import java.applet.Applet;

import java.awt.Graphics;

public class ExampleEventHandling extends Applet

                             implements MouseListener {

    StringBuffer strBuffer;

    public void init() {

         addMouseListener(this);

         strBuffer = new StringBuffer();

        addItem("initializing the applet ");

    }

    public void start() {

        addItem("starting the applet ");

    }

    public void stop() {

        addItem("stopping the applet ");

    }

    public void destroy() {

        addItem("unloading the applet");

    }

    void addItem(String word) {

        System.out.println(word);

        strBuffer.append(word);

        repaint();

    }

    public void paint(Graphics g) {

         //Draw a Rectangle around the applet's display area.

        g.drawRect(0, 0,

                      getWidth() - 1,

                      getHeight() - 1);

         //display the string inside the rectangle.

        g.drawString(strBuffer.toString(), 10, 20);

    }

    public void mouseEntered(MouseEvent event) {

    }

    public void mouseExited(MouseEvent event) {

    }

    public void mousePressed(MouseEvent event) {

    }

    public void mouseReleased(MouseEvent event) {

    }

    public void mouseClicked(MouseEvent event) {

         addItem("mouse clicked! ");

    }

}

<html>

<title>Event Handling</title>

<hr>

<applet code="ExampleEventHandling.class"

width="300" height="300">

</applet>

<hr>

</html>

import java.applet.*;

import java.awt.*;

import java.net.*;

public class ImageDemo extends Applet

{

  private Image image;

  private AppletContext context;

  public void init()

  {

      context = this.getAppletContext();

      String imageURL = this.getParameter("image");

      if(imageURL == null)

      {

         imageURL = "java.jpg";

      }

      try

      {

         URL url = new URL(this.getDocumentBase(), imageURL);

         image = context.getImage(url);

      }catch(MalformedURLException e)

      {

         e.printStackTrace();

         // Display in browser status bar

         context.showStatus("Could not load image!");

      }

   }

   public void paint(Graphics g)

   {

      context.showStatus("Displaying image");

      g.drawImage(image, 0, 0, 200, 84, null);

      g.drawString("www.javalicense.com", 35, 100);

   }

}

<html>

<title>The ImageDemo applet</title>

<hr>

<applet code="ImageDemo.class" width="300" height="200">

<param name="image" value="java.jpg">

</applet>

<hr>

</html>

import java.applet.*;

import java.awt.*;

import java.net.*;

public class AudioDemo extends Applet

{

   private AudioClip clip;

   private AppletContext context;

   public void init()

   {

      context = this.getAppletContext();

      String audioURL = this.getParameter("audio");

      if(audioURL == null)

      {

         audioURL = "default.au";

      }

      try

      {

         URL url = new URL(this.getDocumentBase(), audioURL);

         clip = context.getAudioClip(url);

      }catch(MalformedURLException e)

      {

         e.printStackTrace();

         context.showStatus("Could not load audio file!");

      }

   }

   public void start()

   {

      if(clip != null)

      {

         clip.loop();

      }

   }

   public void stop()

   {

      if(clip != null)

      {

         clip.stop();

      }

   }

}

<html>

<title>The ImageDemo applet</title>

<hr>

<applet code="ImageDemo.class" width="0" height="0">

<param name="audio" value="test.wav">

</applet>

<hr>

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吴裕雄--天生自然 JAVA开发学习：Applet 基础

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