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Serious applet problem
Hola dear java friends
I am still hanging in the thin air: can not make my applet to
work from a html-server (get the mysterious
java.lang.ClassFormatError: Incompatible magic value 1008821359 in class file Imgslides)
Other java application (applets) do work when contacting that server.
The image application does work locally.
I do not think there is a java version problem (the applet runs on the
client machine and I do have the latest version of jvm and the applet
runs on my macbook and on the pc of my son).
THIS IS A PRETTY DESPERADO SITUATION, which I’d like to resolve.
The image applet is very flexible because it loads parameters form a source file,
(Setting size of the applet, order of the photos, a text info for each photo
the color and position of the text and the duration of each individual photo.)
Hereby I mail the code of the applet. Feel free to comment on it (of
course especially the error part).
In order the applet works well you need to prepare two more things:
1) a image folder called Imagestore (containing the pictures in jpg)
2) a source file (text only) to set the parameters of the applet
Each line of the source file sets stuff for each photo see the application info
for that:
/*
*
*
* Created on March 2, 2008, 8:10 PM
* The Slideresource file can be found in the folder
* Imagestore that should be in the work directory.
* The Imagestore folder contains all the images (jpg
* one size of the applet).
* first line of Slidessource.txt file is:
* the word imageslideapplet, int appletwidth, int appletheight
* and each following line contains:
* 1) string, image file name (string without space),
* 2) string, the info text (several words) ended by space //.
* 3) string, text color (white, black, green, red, blue).
* 4,5) int, the infotext coordinates in pixels width, height, 0, 0, standard.
* 6) the delay time for each photo in seconds like 9 (sec no miliseconds).
* 7) the number for the cross fades (not done yet).
*/
import java.applet.Applet;
import java.awt.*;
import java.awt.Image;
import java.awt.event.*;
import java.text.DecimalFormat;
import java.util.Scanner;
import javax.imageio.ImageIO;
import javax.swing.*;
import java.net.URL;
import java.io.*;
import java.awt.image.BufferedImage;
import javax.swing.text.BadLocationException;
import java.net.MalformedURLException;
public class Imgslides extends JApplet {
private int count, maxcount, x, y, randcount,
textposx, textposy, imgwidth, imgheight, framew, frameh;
private Scanner scanner;
private Img[] img;
private JOptionPane infoPane;
private JPanel picttextPanel;
private ImageDisplay displayPanel; // The photo and info text panel
private Boolean gate;
private JLabel textLabel;
private Timer imgtimer;
public void init() {
count=0; // image and textstring counters
maxcount = 0;
framew = 350; // frame size to be set
frameh = 390;
textposx = 120; // text position to be set
textposy = 310;
displayPanel = new ImageDisplay();
textLabel = new JLabel();
EventHandler listener = new EventHandler();
imgtimer = new Timer(9000, listener);
imgtimer. setRepeats(true);
setContentPane(displayPanel);
setSize(350,390);
setLocation(0,0);
readsourcedata("Imagestore/Slidessource.txt");
displayPanel.setLayout(null);
textLabel.setBounds(textposy,textposx, 300 , 50);
displayPanel.add(textLabel);
randcount = (int)(maxcount*Math.random()) + 1;
gate = true;
imgtimer.start();
}
private class EventHandler implements ActionListener { // The event listener of the timer.
public void actionPerformed(ActionEvent evt) {
if (evt.getSource() == imgtimer) {
if (gate) // the first photo random picked
count = randcount;
gate = false; // close the random gate
count++;
if (count==maxcount)
count=0;
displayPanel.repaint();
imgtimer.setDelay(img[count].delay*1000); // set the individual delay for each photo
}
}
}
private static class Img { // the image file info record array
String name, info, textcolor;
int delay, fadeout, textx, texty;
}
private Image downloadImage(String filename) { // the image file reader
Image images=null;
URL url;
url = getClass().getResource("Imagestore/" + filename);
try {
images = ImageIO.read(url);
} catch (IOException ex) {
JOptionPane.showMessageDialog(infoPane, "can not read file " + ex);
}
try {
imgwidth = images.getWidth(this);
}
catch (Exception e) {
JOptionPane.showMessageDialog(infoPane, "can not get image width " + e);
}
try {
imgheight = images.getHeight(this);
}
catch (Exception e) {
JOptionPane.showMessageDialog(infoPane, "can not get image height " + e);
}
x = (int)(framew - imgwidth)/2; // to centre the image on the window
y = (int)(frameh - imgheight)/2;
return images;
}
private class ImageDisplay extends JPanel { // Defines the display panel.
public void paintComponent(Graphics g) { // for painting the images
this.setBackground(Color.WHITE);
super.paintComponent(g);
g.drawImage(downloadImage(img[count].name),x, y, imgwidth, imgheight,this); // width/x height/y
textLabel.setBounds(img[count].textx,img[count].texty, 300 , 50); // te image infotext
settextColor(img[count].textcolor); // color, position
textLabel.setText(img[count].info);
}
}
private void settextColor(String str) {
if (str.equalsIgnoreCase("RED"))
textLabel.setForeground(Color.RED);
else
if (str.equalsIgnoreCase("BLUE"))
textLabel.setForeground(Color.BLUE);
else
if (str.equalsIgnoreCase("GREEN"))
textLabel.setForeground(Color.GREEN);
else
if (str.equalsIgnoreCase("WHITE"))
textLabel.setForeground(Color.WHITE);
else
if (str.equalsIgnoreCase("YELLOW"))
textLabel.setForeground(Color.YELLOW);
else
textLabel.setForeground(Color.BLACK);
}
private void readsourcedata(String filename) { // the source file reader
URL txtfile=null;
String str=null, inputLine=null;
BufferedReader in=null;
int i=0, textlength=0;
try {
txtfile = new URL(getDocumentBase(), filename);
}
catch (MalformedURLException ex) {
JOptionPane.showMessageDialog(infoPane,
"can not find the source file " + filename);
ex.printStackTrace();
}
try {
in = new BufferedReader( new InputStreamReader(txtfile.openStream()));
}
catch (IOException ex) {
JOptionPane.showMessageDialog(infoPane,
"can not read the source file " + filename);
ex.printStackTrace();
}
try {
while ((inputLine = in.readLine()) != null)
maxcount++;
maxcount = maxcount - 1; // taking info lines out
img = new Img[maxcount]; // create the image record array
for ( i = 0; i < maxcount; i++) // create the objects
img[i] = new Img();
//JOptionPane.showMessageDialog(infoPane,
// " maxcount " + maxcount + " codebase " + getDocumentBase());
}
catch (IOException ex) {
ex.printStackTrace();
JOptionPane.showMessageDialog(infoPane,
"can not read number of lines in file: " + filename);
}
try {
in.close();
}
catch (IOException ex) {
JOptionPane.showMessageDialog(infoPane,
"can not close file: " + filename);
ex.printStackTrace();
}
// open file again for data reading
try {
scanner = new Scanner( new InputStreamReader(txtfile.openStream()));
}
catch (IOException ex) {
ex.printStackTrace();
JOptionPane.showMessageDialog(infoPane,
"can not read the source file " + filename);
}
str = scanner.next();
if (str.equalsIgnoreCase("dragstraimageslideapplet")) { // check the file id
framew = scanner.nextInt(); frameh = scanner.nextInt();// read the applet window size
str = scanner.nextLine();
for ( i = 0; i < maxcount; i++) { // reading the data Still INSERT CATCH CLAUSES
img[i].info = ""; // the line count is for array setup
//String str = in.readLine(); // can be ommitted when setting the number at source
img[i].name=scanner.next(); // reads the first token is image filename
str = scanner.next(); // start reading info string // marks end of string
while (!str.equalsIgnoreCase("//")) {
str = str + " ";
img[i].info = img[i].info.concat(str); // putting the string together
str = scanner.next();
}
textlength = img[i].info.length();
textlength = (int)((textlength*6.5)/2)+0; // 6.5
img[i].textcolor = scanner.next();
img[i].texty = scanner.nextInt()+(frameh-70);
img[i].textx = scanner.nextInt() + ((framew/2)-textlength);
img[i].delay = scanner.nextInt();
img[i].fadeout = scanner.nextInt();
str = scanner.nextLine();
}
img[maxcount-1].delay = img[0].delay; // delay shift, one spot advanced
for (i = 1; i < maxcount; i++) // for correct individual photo delay
img[i-1].delay = img[i].delay;
}
else {
JOptionPane.showMessageDialog(infoPane,
filename + " has not the right format");
}
scanner.close();
try {
in.close();
}
catch (IOException ex) {
JOptionPane.showMessageDialog(infoPane,
"can not close file: " + filename);
ex.printStackTrace();
}
} // end of source file reader
}
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Linear Mode
