Trouble executing(actionlistener) the swing applet properly in html

[aybee ryu]

Hi,

Following is the applet code below:

import javax.swing.*;
import java.awt.*;
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.ImageObserver;
import java.net.InetAddress;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.UnknownHostException;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.beans.*;
import java.util.Random;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import javax.swing.ImageIcon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class ui extends JApplet implements ActionListener{
public static JPanel panel2;
private JTextField subnetField =null;
public static JPanel panel3;
public static Font fc;
public static String[] subn;
public static String searchnet;
boolean flag=false;
public void init()
{
String hostname = null;
String hostaddress=null;
try {
InetAddress addr = InetAddress.getLocalHost();
// Get IP Address
hostaddress=addr.getHostAddress();
// Get hostname
hostname = addr.getHostName();
} catch (UnknownHostException e) {
}
subn= hostaddress.split("\\.");
System.out.println(subn[2]);
searchnet=subn[2];
//WindowDestroyer listener=new WindowDestroyer();
//addWindowListener(listener);
Container contentPane = getContentPane();
contentPane.setBackground(Color.WHITE);
contentPane.setLayout(new GridLayout(3,0));
JPanel panel1 =new JPanel();
panel2 =new JPanel();
panel1.setBackground(Color.WHITE);
panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS));
JLabel lb2 = new JLabel("You are at: "+hostname+" "+hostaddress+" ");
lb2.setFont(new Font("sans-serif",Font.BOLD,15));
lb2.setForeground(Color.RED);
JPanel panel1_1 =new JPanel(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 1;
c.gridy = 2;
panel1_1.setBackground(Color.WHITE);
panel1_1.add(lb2, c);
//lb2.setAlignmentX(Component.CENTER_ALIGNMENT);
//panel1_1.add(lb2, BorderLayout.EAST);
panel1_1.setAlignmentX(Component.CENTER_ALIGNMENT);
panel1.add(panel1_1);
panel3=new JPanel();
panel3.setLayout(new GridLayout(2,0));
panel3.setBackground(Color.WHITE);
panel1.add(panel3);
UIManager.put("Button.background", Color.white);
UIManager.put("Button.foreground", Color.red);
fc = new Font("sans-serif",Font.BOLD,15);
UIManager.put("Button.font", fc);
JButton searchButton= new JButton("Search");
//Border b = new SoftBevelBorder(BevelBorder.LOWERED) ;
//searchButton.setBorder(b);
searchButton.setAlignmentX(Component.CENTER_ALIGNMENT);
panel1.add(searchButton);
searchButton.addActionListener(this);
contentPane.add(panel1);
panel2.setBackground(Color.WHITE);
contentPane.add(panel2);
//contentPane.add(searchButton);
//JButton closeButton=new JButton("Close");
//contentPane.add(closeButton);
//closeButton.addActionListener(this);
contentPane.setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
if (e.getActionCommand ().equals ("Close"))
{
System.exit(0);
}
if (e.getActionCommand ().equals ("Search"))
{
panel2.setVisible(false);
panel2.removeAll();
panel2.revalidate();
panel3.setVisible(false);
panel3.removeAll();
panel3.revalidate();
if(flag){
searchnet=subnetField.getText();
}
result(panel2);//puts panel 2&panel 3 in the ui
panel2.setVisible(true);
panel3.setVisible(true);
}
}
public boolean complete;
public JPanel call(){
return null;
}
public void result(JPanel pn){
.
.
.
}
}
}
private void addColumnName(JPanel pn) {
// TODO Auto-generated method stub
}
public void addDataToTable(JPanel p, String element, int type){
......
}
private static void open(URI uri) {
if (Desktop.isDesktopSupported()) {
Desktop desktop = Desktop.getDesktop();
try {
desktop.browse(uri);
} catch (Exception e) {
// TODO: error handling
}
} else {
// TODO: error handling
}
}
public static void main(String[] args){
ui start=new ui();
start.setVisible(true);
JFrame f = new JFrame("Find Device");
ui applet=new ui();
applet.init();
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(800,450);
f.setVisible(true);
}
}

then the html file looks like this:

<html> <applet code=ui.class archive="webapplet.jar" width=800 height=450> </applet> </body> </html>



when i run the program via eclipse as an applet it runs fine, but when i put it in the html file, the init() seems to show up but the actionlistener on the button never seems to work

Any help would be really appreciated. Thanks!!

ps: will be happy to share any additional details if required

[aybee ryu]

nobody has an answer for this?? That is discouraging

[Ulf Dittmer]

Well, you're not exactly making it easy for us to help you. For example, what's with all the empty lines? It seems you could remove about a third of your code that does nothing but impact people's ability to comprehend it.

Also, what is "the button"? A particular one? If so, which one? What happened when you did click on it? Did the handler get called? You're implying no. I suspect yes, but it just didn't do what you thought it should be doing.

Furthermore, at a quick glance, I see two catch blocks that do precisely nothing. Unless you're generating an error message of some kind that you're guaranteed to see, that's just a recipe for trouble.

[aybee ryu]

 

Ulf Dittmer wrote:Well, you're not exactly making it easy for us to help you. For example, what's with all the empty lines? It seems you could remove about a third of your code that does nothing but impact people's ability to comprehend it.

Also, what is "the button"? A particular one? If so, which one? What happened when you did click on it? Did the handler get called? You're implying no. I suspect yes, but it just didn't do what you thought it should be doing.

Furthermore, at a quick glance, I see two catch blocks that do precisely nothing. Unless you're generating an error message of some kind that you're guaranteed to see, that's just a recipe for trouble.

I just thought i might be messing up the way i set up my jar file with the applet or something similar, so providing more stuff would be redundant..... Please do note that the applet works absolutely fine when I run it off eclipse as an applet. The problem is when i put it up on the html....i have tried multiple browsers(just to make the compatible between different browsers thing)


Let's go over the whole project in detail.....


the primary objective of this project to find a list of small embedded servers in a local network.

files:

ui.java----->primary display of interface
FindSiteplayer.java---->the real part which finds these servers


ui.java

public class ui extends JApplet implements ActionListener{
public static JPanel panel2;
private ProgressMonitor progressMonitor;
//private Task task;
//public resultset set;
public ExecutorService es;
public FutureTask<JPanel> f;
private JTextField subnetField =null;
public static JPanel panel3;
public static Font fc;
public static String[] subn;
public static String searchnet;
boolean flag=false;
public void init()
{
String hostname = null;
String hostaddress=null;
try {
InetAddress addr = InetAddress.getLocalHost();
// Get IP Address
hostaddress=addr.getHostAddress();
// Get hostname
hostname = addr.getHostName();
} catch (UnknownHostException e) {
}
subn= hostaddress.split("\\.");
System.out.println(subn[2]);
searchnet=subn[2];
//WindowDestroyer listener=new WindowDestroyer();
//addWindowListener(listener);
Container contentPane = getContentPane();
contentPane.setBackground(Color.WHITE);
contentPane.setLayout(new GridLayout(3,0));
JPanel panel1 =new JPanel();
panel2 =new JPanel();
panel1.setBackground(Color.WHITE);
panel1.setLayout(new BoxLayout(panel1, BoxLayout.Y_AXIS));
//URL url = ui.class.getResource("acurus.png");
//ImageIcon icon = new ImageIcon(url);
//ImageIcon img = new ImageIcon("acurus.png");
//Image image = img.getImage();
//JLabel lb1 = new JLabel(icon);
//lb1.setBackground(Color.WHITE);
//lb1.setAlignmentX(Component.CENTER_ALIGNMENT);
//panel1.add(lb1);
JLabel lb2 = new JLabel("You are at: "+hostname+" "+hostaddress+" ");
lb2.setFont(new Font("sans-serif",Font.BOLD,15));
lb2.setForeground(Color.RED);
JPanel panel1_1 =new JPanel(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.gridx = 1;
c.gridy = 2;
panel1_1.setBackground(Color.WHITE);
panel1_1.add(lb2, c);
//lb2.setAlignmentX(Component.CENTER_ALIGNMENT);
//panel1_1.add(lb2, BorderLayout.EAST);
panel1_1.setAlignmentX(Component.CENTER_ALIGNMENT);
panel1.add(panel1_1);
panel3=new JPanel();
panel3.setLayout(new GridLayout(2,0));
panel3.setBackground(Color.WHITE);
panel1.add(panel3);
UIManager.put("Button.background", Color.white);
UIManager.put("Button.foreground", Color.red);
fc = new Font("sans-serif",Font.BOLD,15);
UIManager.put("Button.font", fc);
JButton searchButton= new JButton("Search");
//Border b = new SoftBevelBorder(BevelBorder.LOWERED) ;
//searchButton.setBorder(b);
searchButton.setAlignmentX(Component.CENTER_ALIGNMENT);
panel1.add(searchButton);
searchButton.addActionListener(this);
contentPane.add(panel1);
panel2.setBackground(Color.WHITE);
contentPane.add(panel2);
//contentPane.add(searchButton);
//JButton closeButton=new JButton("Close");
//contentPane.add(closeButton);
//closeButton.addActionListener(this);
panel2.setVisible(false);
panel3.setVisible(false);
contentPane.setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
/*if (e.getActionCommand ().equals ("Close"))
{
System.exit(0);
}
if (e.getActionCommand ().equals ("Search"))
{*/
panel2.setVisible(false);
panel2.removeAll();
panel2.revalidate();
panel3.setVisible(false);
panel3.removeAll();
panel3.revalidate();
if(flag){
searchnet=subnetField.getText();
}
result(panel2);
panel2.setVisible(true);
panel3.setVisible(true);
//}
}
public boolean complete;
public JPanel call(){
return null;
}
public void result(JPanel pn){
FindSiteplayer res=new FindSiteplayer();
int scantype=0;
res.run(searchnet);
String[][] list = res.getlist();
int rows =res.getNumberOfDevicesFound();
if(rows==0){
}
if(rows==1){
JPanel panel3_2=new JPanel();
JLabel lb3_1 = new JLabel(" "+rows+" device found!");
lb3_1.setFont(fc);
lb3_1.setForeground(Color.RED);
panel3_2.setBackground(Color.WHITE);
panel3_2.add(lb3_1);
JPanel panel3_1=new JPanel();
JLabel lb3 = new JLabel("192.162.");
lb3.setFont(fc);
lb3.setForeground(Color.RED);
panel3_1.add(lb3);
panel3_1.setBackground(Color.WHITE);
subnetField=new JTextField(3);
subnetField.setText(searchnet);
panel3_1.add(subnetField);
JLabel lb4 = new JLabel(".xxx");
lb4.setFont(fc);
lb4.setForeground(Color.RED);
panel3_1.add(lb4);
panel3.add(panel3_2);
panel3.add(panel3_1);
flag=true;
}else{
JPanel panel3_2=new JPanel();
JLabel lb3_1 = new JLabel(" "+rows+" devices found!");
lb3_1.setFont(fc);
lb3_1.setForeground(Color.RED);
panel3_2.setBackground(Color.WHITE);
panel3_2.add(lb3_1);
JPanel panel3_1=new JPanel();
JLabel lb3 = new JLabel("192.162.");
lb3.setFont(fc);
lb3.setForeground(Color.RED);
panel3_1.add(lb3);
panel3_1.setBackground(Color.WHITE);
subnetField=new JTextField(3);
subnetField.setText(searchnet);
//subnetField.setColumns(3);
panel3_1.add(subnetField);
JLabel lb4 = new JLabel(".xxx");
lb4.setFont(fc);
lb4.setForeground(Color.RED);
panel3_1.add(lb4);
panel3.add(panel3_2);
panel3.add(panel3_1);
flag=true;
}
pn.setLayout(new GridLayout((rows+1),5));
System.out.println("rows="+rows);
addColumnName(pn);
for(int i=0; i<rows; i++){
for(int j=0; j<5;j++){
if(j==2){
continue;
}
if(j==0){
if(list[i][2].equalsIgnoreCase("Acurus"))
{
URL url = ui.class.getResource("acurusicon.png");
ImageIcon icon = new ImageIcon(url);
JLabel lb1 = new JLabel(icon);
lb1.setBackground(Color.WHITE);
lb1.setAlignmentX(Component.CENTER_ALIGNMENT);
pn.add(lb1);
}
}
addDataToTable(pn, list[i][j], j);
}
}
}
private void addColumnName(JPanel pn) {
// TODO Auto-generated method stub
pn.add(new JLabel("<html><b>                    <u>Brand</u></b></html>"));
JLabel cn1=new JLabel();
cn1.setText("<html> <b>            <u>Device</u></b></html>");
pn.add(cn1);
JLabel cn2=new JLabel();
cn2.setText("<html> <b><u> Configuration</u></b></html>");
pn.add(cn2);
JLabel cn3=new JLabel();
cn3.setText("<html> <b><u> MAC Address</u></b></html>");
pn.add(cn3);
JLabel cn4=new JLabel();
cn4.setText("<html> <b><u> IP Address</u></b></html>");
cn4.setAlignmentX(RIGHT_ALIGNMENT);
pn.add(cn4);
}
public void addDataToTable(JPanel p, String element, int type){
if(type==4){
try{
final URI uri = new URI("http://"+element);
JPanel pb=new JPanel();
pb.setLayout(new BorderLayout());
pb.setBackground(Color.WHITE);
JButton button = new JButton();
button.setText(element);
button.setHorizontalAlignment(SwingConstants.LEFT);
//button.setBorderPainted(false);
//button.setOpaque(false);
button.setBackground(Color.WHITE);
button.setToolTipText(uri.toString());
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
open(uri);
}
});
pb.add(button, BorderLayout.WEST);
p.add(pb);
}catch(Exception e){
}
}
else{
JPanel labe=new JPanel();
labe.setLayout(new BorderLayout());
labe.setBackground(Color.WHITE);
labe.add(new JLabel(element),BorderLayout.CENTER);
p.add(labe);
}
}
private static void open(URI uri) {
if (Desktop.isDesktopSupported()) {
Desktop desktop = Desktop.getDesktop();
try {
desktop.browse(uri);
} catch (Exception e) {
// TODO: error handling
}
} else {
// TODO: error handling
}
}
public static void main(String[] args){
ui start=new ui();
start.setVisible(true);
JFrame f = new JFrame("Find Device");
ui applet=new ui();
applet.init();
f.setLocationRelativeTo(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(800,450);
f.setVisible(true);
}
}

Important notes: The way I do it is initially the user sees self ip and hostname and he or she provided with a search button...as soon as the button is pressed a search in the current user subnet is initiated and the result is got back in 2d string array. this 2d array with other external data like (image icons and all) is used to dynamically create a panel which is set right below the search button. Again the whole thing works absolutely the way it is suppose to be in an applet form in the IDE but as soon as i import the project as a jar file from the eclipse IDE and try embedding it in a html page....only the initial state is reached (the hostaddress & name with search button) any later panels created after actionlistener doesn't show up on the page and one gets a feeling that the search button actually does nothing. Also do note the way i make jar file in eclipse:- file->export->JAR file->(select everything in the resources to export)+check export generated class files and res +check export java source files and res +<options> check compress the contents of the jar file




please let know if you need any further info or clarification + anything you would want me try out (i m following this thread hardcore, so any response can be dealt with almost immediately)

Thanks

Greatly appreciate it:)

[aybee ryu]

Please also note that there might be a lot of dead code, reason being it went through many iterations and this is a very pre-alpha state project.

Thanks

[Ulf Dittmer]

You misunderstood: I was asking for much less code, not more code. The more code you post, the less likely it is that anyone will bother to go through it.

[aybee ryu]

 

Ulf Dittmer wrote:You misunderstood: I was asking for much less code, not more code. The more code you post, the less likely it is that anyone will bother to go through it.

I just got it there if someone actually wanted to dig deeper, i guess just the important note section is good enough from the previous post then.

Important notes: The way I do it is initially the user sees self ip and hostname and he or she provided with a search button...as soon as the button is pressed a search in the current user subnet is initiated and the result is got back in 2d string array. this 2d array with other external data like (image icons and all) is used to dynamically create a panel which is set right below the search button. Again the whole thing works absolutely the way it is suppose to be in an applet form in the IDE but as soon as i import the project as a jar file from the eclipse IDE and try embedding it in a html page....only the initial state is reached (the hostaddress & name with search button) any later panels created after actionlistener doesn't show up on the page and one gets a feeling that the search button actually does nothing. Also do note the way i make jar file in eclipse:- file->export->JAR file->(select everything in the resources to export)+check export generated class files and res +check export java source files and res +<options> check compress the contents of the jar file

 

[Ulf Dittmer]

I advise again to properly handle exceptions - running an applet in a browser is NOT the same as running it in appletviewer or an IDE. Things that work in one of those environments don't necessarily work in the others.