初学，问题与提问方式似乎都很幼稚……
从案例开始的初学，经常问题表述不清，请多包涵、指点
以下是applet图形按钮代码。从书中直接抄下来的。
1 需要在什么位置嵌入网页地址么？当前代码运行后神马都没有。
2 soundA/B声音文件必须是wav格式么？如果网页本身没有音频文件，可以自己找些mp3代替么？
3 图片可否是png格式？
4 图片和音频文件必须存放于代码文件夹么？
5 getDocumentBase()能否给解释一下？
手册还在熟悉阶段，有点晕，所以想用这种偷懒方式打算稍微积累下先。手册的使用方法是一直在学的，不过……请多指教！
因为问题会很多，每次只能给20分，请见谅！
package JavaApplet;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
public class ImgButton extends Applet implements MouseListener{
private int width, height;
private Image offI, img1, img2, img3;
private Graphics offG;
private MediaTracker imageTracker;
private boolean isMouseEnter = false, isPress = false;
private Color ButtonColor = Color.yellow, lightC, darkC;
private URL url;
private AudioClip soundA, soundB;
private String param;
public void init(){
param = new String();
//get sound file from html
param = getParameter("soundA");
if (param == null)
param = "midiA.mid";
soundA = getAudioClip (getDocumentBase(), param);
param = getParameter("soundB");
if (param == null)
param = "midiB.mid";
soundB = getAudioClip (getDocumentBase(), param);
//get size of fig from html
width = getSize().width;
height = getSize().height;
//get url from html
// param = getParameter ("URL");
param = getParameter ("C:\\Users\\leo\\Desktop\\2.png");
try {
url = new URL(param);
}catch (MalformedURLException e){
}
//set fig and load to fig-tracker
offI = createImage(width, height);
offG = offI.getGraphics();
imageTracker = new MediaTracker(this);
param = getParameter("Images1");
img1 = getImage(getCodeBase(), param);
param = getParameter("Images2");
img2 = getImage(getCodeBase(), param);
param = getParameter("Images3");
img3 = getImage(getCodeBase(), param);
try{
imageTracker.waitForID(0);
}catch (InterruptedException e){
}
//set mouse-listener
addMouseListener(this);
}
public void start(){//method of applet start
offG.drawImage(img1, 0, 0, width, height, this);
repaint();
}
public void mouseClicked(MouseEvent e){//mouse-click event
}
public void mousePressed(MouseEvent e){//press the mouse not release
offG.drawImage(img3, 0, 0, width, height, this);
repaint();
soundA.play();
}
public void mouseReleased(MouseEvent e){//release the mouse
offG.drawImage(img2, 0, 0, width, height, this);
repaint();
soundB.play();
getAppletContext().showDocument(url);
}
public void mouseEntered(MouseEvent e){//mouse enter
offG.drawImage(img2, 0, 0, width, height, this);
repaint();
}
public void mouseExited(MouseEvent e){//mouse exit
offG.drawImage(img1, 0, 0, width, height, this);
repaint();
}
public void paint(Graphics g) {//draw it
g.drawImage(offI, 0, 0, width, height, this);
}
}
[解决办法]
楼主发表于：2012-07-28 15:06:11
从案例开始的初学，经常问题表述不清，请多包涵、指点
以下是applet图形按钮代码。从书中直接抄下来的。
1 需要在什么位置嵌入网页地址么？当前代码运行后神马都没有。
2 soundA/B声音文件必须是wav格式么？如果网页本身没有音频文件，可以自己找些mp3代替么？
可以的
3 图片可否是png格式？可以的
4 图片和音频文件必须存放于代码文件夹么？需要放在固定文件夹的。
5、对于getDocumentBase()
/** * Gets the URL of the document in which this applet is embedded. * For example, suppose an applet is contained * within the document: * <blockquote><pre> * http://java.sun.com/products/jdk/1.2/index.html * </pre></blockquote> * The document base is: * <blockquote><pre> * http://java.sun.com/products/jdk/1.2/index.html * </pre></blockquote> * * @return the {@link java.net.URL} of the document that contains this * applet. * @see java.applet.Applet#getCodeBase() */ public URL getDocumentBase() { return stub.getDocumentBase(); }这里是放URL的。