Display images in applets
hi every body.
I want to display images in an applet when i invoke it from the jsp page . it is not working. the code is as follows.
<html>
<body>
<jsp:plugin type = "applet"
code ="Welcome.class"
width="475" height = "350" >
</jsp:plugin>
</body>
</html>
while the code of "Welcome.java" is as follows.
ImageIcon image = new ImageIcon("aa.gif");
JButton button = new JButton(image);
i have placed the aa.gif file in the same directory where i placed the Welcome.class and the jsp file.
when i run this program the i recieve the message that the applet is not loaded.
can some body help me how to place images in applets.
thanks.
You should be able to test that applet on you hard drive first. If it works check the case of the image file.
Web servers look for case. If you are asking for ImageIcon img = new ImageIcon("abc.gif") and what is loaded on your web server is "abc.GIF" it won't find it. Same goes for basic HTML tags like
<Img src=abc.gif>. But it will find it on you hard drive when you run the applet there.
Similar Messages
-
i have a server and a client program... i need to send an image from the server program and display it on the applet.... i think it can be done by ImageIcon(byte[] ImageData) in the applet.... i hope someone writes a code for me to make stream of byte of the image on the server side and recieve the stream on the applet side and display the image....
Thanks in advance...
Uzairpublic class Server {
private static final int port = 2573;
public static void main(String[] args) {
FileInputStream FIS;
try {
FIS = new FileInputStream(args[0]);
}catch(Exception e) {
e.printStackTrace();
return;
byte[] data = new byte[FIS.available()];
FIS.read(data);
FIS.close();
System.out.println("Image read. Waiting for client...");
Socket socket;
OutputStream stream;
try{
socket = (new ServerSocket(port)).accept();
stream = socket.getOutputStream();
}catch(Exception e){
e.printStackTrace();
return;
System.out.println("Client connected. Sending image...");
stream.write(data);
stream.close();
System.out.println("Done. Good Luck Client!");
public class Client {
private static final String host = "localhost";
private static final int port = 2573;
public static void main(String[] args) {
System.out.println("Connecting to Server...");
Socket socket;
InputStream stream;
byte[] buffer = new buffer[1048576], data;
int i, read, total = 0;
ImageIcon image;
try{
socket = new Socket(host, port);
stream = socket.getInputStream();
System.out.println("Connected. Reading data...");
while((read = stream.read(buffer, total, buffer.length - total)) >= 0)
total += read;
data = new byte[total];
System.arraycopy(buffer, 0, data, 0, total);
image = new ImageIcon(data);
}catch(Exception e){
e.printStackTrace();
return;
System.out.println("Image retrieved! Doing something about it now...");
//Your code for displaying the image somewhere in the applet
}Hope this helps~
Alex Lam S.L. -
Display image in applet - need help
Ive got this code in my applet
Image image1 = toolkit.getImage("images/background.jpg");
Which runs fine when run locally, but when I try to run it from a html in a browser it starts to fire off lots of security messages.
How can i do this?
the remainder is I set it as my background
g.drawImage(image, 0, 0, this);I have tried the following while running the applet in a browser and it worked...so I guess you can give this a try...
java.net.URL backgroundImage = getClass().getResource("back.jpg");
ImageIcon icon = new ImageIcon(backgroundImage);
and then use this ImageIcon to set the background. -
Printing from a applet toolbar the image displayed in the applet
Hi ,
I have a JApplet which displays a tiff image. The applet uses JAI API and Java 2D for printing. I can zoom in . zoom out , invert the image and I am printing the displayed image also .
In the action handler class for the print button , I have made an inner class implementing printable and executing the print function.
I am doing printing via a separate thread as i don't want my action handler class to keep waiting till the image gets printed . The user should be able to manipulate the image after it has clicked on the "ok" of the print dialog, while the image is being printed. This is the reason for printing the image in a separate thread
and the actual printing process is a synchronized method called by the run method of the thread .
If I click on print button twice , one after another , the second image gets printed only after I get a response from the printer that image has been printed as expected (as the print method is synchronized ).
In the action handler class of print , I do not call join on the thread as I do not want it to wait for printing to get over ( printing of a tiff image actually takes a long time ?? )
Is there anyway to make the threads independent of the main applet . Like after firing the print command , if I close the applet and I haven't got a confirmation from the printer, I get a blank page or nothing but i get a response message from printer that printing is done .
Is it essential for a thread to wait till the printer sends a response that printing is over ?
Similarly , If after firing the printing command and without waiting for the confirmation from the printer , I refresh the applet , proper printing does not occur but I get a message from the printer that printing is done .
If i use synchronized method for printing and wait till the printer response from the printer comes without closing or refreshing the applet , printing occurs fine .
Can anyone please tell me what is actually happening and is there a better way to print and that printing occurs after the print command has been fired irrespective of the applet ?
Regards , NavneetHey can you send me the code for the same. I know its been a long while, but I am new to JAI and need the same stuff u coded. u can mail it to me on [email protected]
Thanks in advance. -
Problem with display of images in applets
Hi all,
When I run this program, the appletviewer window is showing no output (i.e. no image). I'm using the netbeans IDE 5.0.
Blue hills.jpg is present in both the src folder and build folder.
* <applet code="image" width =800 height=600>
* <param name="img" value="Blue hills.jpg">
* <\applet>
import java.awt.*;
import java.applet.*;
public class image extends Applet {
Image img;
public void init() {
img=getImage(getDocumentBase(), getParameter("img"));
public void paint(Graphics g){
g.drawImage(img,0,0,this);
Please help in figuring out the problem....It will be looking for it in the folder with the HTML that invokes the applet.
If you want to pack the image in with the applet then use getResource instead.
And spaces in the name are probably not the best idea. -
Display .gif In Applet Problem
I have been making a game. Very simply, the game has a main class and another truely important class that extends JFrame, it is the map. In it i need to upload .gif files and display them. It worked up until recently because i needed to make a sepperate class. I know how to use the getImage() for Images and the the way for ImageIcons, but for some reason, they never display (they display just whiteness). My Code is as follows
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import java.io.*;
// when this puppy reads from a file, it'll be able to have 55 15 x 15 terrains per row
// 35 15 x 15 terrains per column
// arrows by everythign that u would need to consider in finding the problem
// this is not the main class
public class GameMap extends JPanel implements MouseListener, MouseMotionListener, KeyListener{
public static final int MAX_BULLETS = 200;
public static final int MAX_PLAYERS = 50;
public static final int SPLAT_SIZE = 15;
public static final int PLAYER_SIZE = 15;
public static final int MAX_MESSAGES = 10;
public static final int ROBOT_SIZE = 15;
private static final int rowTerrains = 35;
private static final int columnTerrains = 55;
private static int currentBullets = 0;
private static int currentPlayers = 0;
private static int bulletRotation = 0;
private static int aimX, aimY;
private boolean mapLoaded;
private boolean writingMessage;
private boolean imagesLoaded;
private int messageRotation;
private int tileCoord;
private String messageText = "";
private String currentMap;
private Bullet bullet[] = new Bullet[MAX_BULLETS];
private Player player[] = new Player[MAX_PLAYERS];
private Message message[] = new Message[MAX_MESSAGES];
private Color backgroundColor = new Color(81, 141, 23);
private Image offscreenMap; // offscreen image of map
private Graphics mapGraphics;
private ImageIcon yellowSplat1, yellowSplat2, yellowSplat3, yellowSplat4, yellowSplat5, bluePlayerBack, bluePlayerFront, bluePlayerRight, bluePlayerLeft, grass, tree, mountain, robot1;
private Terrain terrain[] = new Terrain[(rowTerrains * columnTerrains)];
public GameMap(){
this(800, 450);
public GameMap(int width, int height){
addMouseListener(this);
addMouseMotionListener(this);
addKeyListener(this); // use method requestFocusInWindow() for this to work
setPreferredSize(new Dimension(width, height));
setBackground(backgroundColor);
for (int x = 0; x < bullet.length; x++){
bullet[x] = new Bullet();
for (int x = 0; x < player.length; x++){
player[x] = new Player();
for (int x = 0; x < message.length; x++){
message[x] = new Message();
for (int x = 0, currentX = 0, currentY = 0; x < (rowTerrains * columnTerrains); x++){
terrain[x] = new Terrain();
terrain[x].setX(currentX);
terrain[x].setY(currentY);
currentX += 15;
if (currentX > columnTerrains * 15){
currentX = 0;
currentY += 15;
player[0].drawPlayer(0, 0);
//loadMap("Map1.txt"); // this is called to load the map right when this object is initialized
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
Composite originalComposite = g2d.getComposite();
if (imagesLoaded == false){
yellowSplat1 = new ImageIcon("yellow1.gif");
yellowSplat2 = new ImageIcon("yellow2.gif");
yellowSplat3 = new ImageIcon("yellow3.gif");
yellowSplat4 = new ImageIcon("yellow4.gif");
yellowSplat5 = new ImageIcon("yellow5.gif");
bluePlayerBack = new ImageIcon("BlueBack.gif");
bluePlayerFront = new ImageIcon("BlueFront.gif");
bluePlayerLeft = new ImageIcon("BlueLeft.gif");
bluePlayerRight = new ImageIcon("BlueRight.gif");
grass = new ImageIcon("Grass.gif");
tree = new ImageIcon("Tree.gif");
mountain = new ImageIcon("Mountain.gif");
robot1 = new ImageIcon("Robot1.gif");
if (mapLoaded == false){ // so a map is loaded when game is started
loadMap("Map1.txt");
mapLoaded = true;
g.drawImage(offscreenMap, 0, 0, this);
for (int x = 0; x < bullet[0].totalBullets; x++){
if (bullet[x].getArrived()){
//find splat type and display it
g2d.setComposite(makeComposite(0.5f));
switch (bullet[x].getSplatType()){
case 0:
yellowSplat1.paintIcon(this, g2d, bullet[x].getDestX() - SPLAT_SIZE / 2, bullet[x].getDestY() - SPLAT_SIZE / 2);
break;
case 1:
yellowSplat2.paintIcon(this, g2d, bullet[x].getDestX() - SPLAT_SIZE / 2, bullet[x].getDestY() - SPLAT_SIZE / 2);
break;
case 2:
yellowSplat3.paintIcon(this, g2d, bullet[x].getDestX() - SPLAT_SIZE / 2, bullet[x].getDestY() - SPLAT_SIZE / 2);
break;
case 3:
yellowSplat4.paintIcon(this, g2d, bullet[x].getDestX() - SPLAT_SIZE / 2, bullet[x].getDestY() - SPLAT_SIZE / 2);
break;
case 4:
yellowSplat5.paintIcon(this, g2d, bullet[x].getDestX() - SPLAT_SIZE / 2, bullet[x].getDestY() - SPLAT_SIZE / 2);
break;
else{
g2d.setComposite(originalComposite);
g2d.setColor(Color.yellow);
g2d.fillOval(bullet[x].getX(), bullet[x].getY(), 3, 3);
g2d.setComposite(originalComposite);
g.setColor(Color.yellow);
for (int x = 0; x < player[0].totalPlayers; x++){
if (player[x].getPlayerPosition().equals("Back")){
bluePlayerBack.paintIcon(this, g2d, player[x].getX(), player[x].getY());
else if (player[x].getPlayerPosition().equals("Right")){
bluePlayerRight.paintIcon(this, g2d, player[x].getX(), player[x].getY());
else if (player[x].getPlayerPosition().equals("Left")){
bluePlayerLeft.paintIcon(this, g2d, player[x].getX(), player[x].getY());
else if (player[x].getPlayerPosition().equals("Front")){
bluePlayerFront.paintIcon(this, g2d, player[x].getX(), player[x].getY());
else{
g2d.fillOval(player[x].getX(), player[x].getY(), 15, 15);
if (writingMessage){
g2d.setColor(new Color(0, 0, 130));
g2d.setComposite(makeComposite(0.5f));
g2d.draw3DRect(8, 7, 800, 17, true);
g2d.setComposite(originalComposite);
g2d.setColor(Color.yellow);
g2d.drawString(messageText, message[0].getX(), 20);
for (int x = 0; x < MAX_MESSAGES; x++){
if (message[x].isDisplayed()){
g2d.drawString(message[x].getMessage(), message[x].getX(), message[x].getY());
private AlphaComposite makeComposite(float alpha) {
int type = AlphaComposite.SRC_OVER;
return(AlphaComposite.getInstance(type, alpha));
public void drawBullet(int aimX, int aimY){
bullet[bulletRotation].drawBullet(player[0].getX() + PLAYER_SIZE / 2, player[0].getY() + PLAYER_SIZE / 2, aimX, aimY);
player[0].setPlayerPosition(bullet[bulletRotation].getPlayerPosition());
bulletRotation++;
if (bulletRotation >= MAX_BULLETS){
bulletRotation = 0;
public void loadMap(String map){
mapLoaded = false;
currentMap = map;
try{
BufferedReader in = new BufferedReader(new FileReader(map));
String input, string1, string2;
for (int x = 0; x < terrain.length; x++){
terrain[x].setFilled(false);
for (int x = 0, currentArray; x < terrain.length; x++){
if ((input = in.readLine()) != null) {
StringTokenizer st = new StringTokenizer(input);
currentArray = Integer.parseInt(st.nextToken());
terrain[currentArray].setTerrainType(st.nextToken());
terrain[currentArray].setFilled(true);
else{
break;
in.close();
offscreenMap = createImage(size().width, size().height);
mapGraphics = offscreenMap.getGraphics();
//mapGraphics.clearRect(0, 0, size().width, size().height);
// everything from here down is to be painted to mapGraphics... but it doesn't get this far cuz of an error
for (int x = 0; x < terrain.length; x++){
if (terrain[x].getTerrainType().equals("Grass")){
grass.paintIcon(this, mapGraphics, terrain[x].getX(), terrain[x].getY());
System.out.println("terrain(" + x + ") is Grass");
else if (terrain[x].getTerrainType().equals("Tree")){
tree.paintIcon(this, mapGraphics, terrain[x].getX(), terrain[x].getY());
System.out.println("terrain(" + x + ") is Tree");
else if (terrain[x].getTerrainType().equals("Mountain")){
mountain.paintIcon(this, mapGraphics, terrain[x].getX(), terrain[x].getY());
System.out.println("terrain(" + x + ") is Mountain");
catch (FileNotFoundException e){
System.out.println("Map not found");
catch (IOException e){
System.out.println("IOException Error!");
// **** mouse Listener ****//
public void mouseClicked(MouseEvent e){}
public void mousePressed(MouseEvent e){}
public void mouseReleased(MouseEvent e){
if (e.getButton() == 1){
//System.out.println("player[0].movePlayer(" + e.getX() + ", " + e.getY() + ")");
aimX = e.getX();
aimY = e.getY();
movePlayer(aimX, aimY);
else if (e.getButton() == 3){
aimX = e.getX();
aimY = e.getY();
drawBullet(aimX, aimY);
public void mouseEntered(MouseEvent e){
if (isFocusOwner() != true){
requestFocusInWindow();
public void mouseExited(MouseEvent e){}
// **** end mouse listener ****//
// **** mouse motion listener ****//
public void mouseDragged(MouseEvent e){}
public void mouseMoved(MouseEvent e){}
// **** end mouse motion listener ****/
public void keyPressed(KeyEvent e){}
public void keyReleased(KeyEvent e){}
public void keyTyped(KeyEvent e){}
}I removed a few unnecessary methods from this code to make it easier to view. EVERYTHING works except for the images displaying. The reason i'm having this problem now is i just redid my workspace and copied the code and i think some glitch stopped it from compiling correctly all along so now i experience this problem in the applet viewer. Though, even before, i couldn't get anything to display in an applet.
And yes, everything is in the same place as the html file.
Thanks for your help!Here's a way to keep track of and paint images with a simple Rectangle array. And also a way to remove lengthy initialization code blocks from paintComponent. Move the images by moving the rectangles.
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import javax.imageio.ImageIO;
import javax.swing.*;
public class GameMapRx
public static void main(String[] args)
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(new GameMapPanel());
f.setSize(400,400);
f.setLocation(200,200);
f.setVisible(true);
class GameMapPanel extends JPanel
Image[] images;
Rectangle[] rects;
boolean firstTime;
final int PAD;
public GameMapPanel()
loadImages();
firstTime = true;
PAD = 20;
protected void paintComponent(Graphics g)
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
int w = getWidth();
int h = getHeight();
if(firstTime)
initializeGameMap(w, h);
for(int i = 0; i < rects.length; i++)
Rectangle r = rects;
g.drawImage(images[i], r.x, r.y, this);
g2.draw(r);
private void loadImages()
String path = "images/duke/";
String ext = ".gif";
images = new Image[10];
for(int i = 0; i < images.length; i++)
try
URL url = getClass().getResource(path + "T" + (i + 1) + ext);
images[i] = ImageIO.read(url);
catch(MalformedURLException mue)
System.out.println("Bad URL: " + mue.getMessage());
catch(IOException ioe)
System.out.println("Unable to read: " + ioe.getMessage());
private void initializeGameMap(int w, int h)
rects = new Rectangle[images.length];
int imageWidth = images[0].getWidth(this);
int imageHeight = images[0].getHeight(this);
int cols = (w - 2*PAD) / imageWidth;
int xInc = imageWidth + (w - cols * imageWidth) / (cols + 1);
int x0 = (w - cols * imageWidth -
(cols - 1) * ((w - cols * imageWidth) / (cols + 1))) / 2;
for(int i = 0; i < images.length; i++)
int x = x0 + xInc * (i % cols);
int rows = i / cols;
int y = PAD + (imageHeight + PAD) * rows;
rects[i] = new Rectangle(x, y, imageWidth, imageHeight);
firstTime = false; -
Help with displaying images (gif, jpeg...) within a JFrame (or similar)
Hi all,
i'm new to the forum and i'll be granted if you kind gentlemen/women could use some advices for my gui home application.
My purpose is to display a static image in a container (i'd prefer to use javax.swing objects, but if you think that java.awt is more suitable for my app, please feel free to tell me about...). I used a modified code from one of the Java Tutorial's examples, tht actually is an applet and displays images as it is using the paint() method. I just can't realize how to set the GraphicContext in a JFrame or a JPanel to contain the image to display, without using applets. Following part of the code I use (a JButton will fire JApplet start, JApplet is another class file called Apple.java):
class DMToolz extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel jContentPane = null;
private JButton jButton = null;
private JComboBox jComboBox = null;
private JMenuItem jMenuItem = null;
private JMenuBar jJMenuBar = null;
private JMenu jMenu = null;
private JMenu jMenu1 = null;
public int w=10, h=10;
public String filename;
* @throws HeadlessException
public DMToolz() throws HeadlessException {
// TODO Auto-generated constructor stub
super();
initialize();
public DMToolz(String arg0) throws HeadlessException {
super(arg0);
// TODO Auto-generated constructor stub
initialize();
* This method initializes jButton
* @return javax.swing.JButton
private JButton getJButton() {
if (jButton == null) {
jButton = new JButton();
jButton.setBounds(new Rectangle(723, 505, 103, 38));
jButton.setText("UrcaMado'");
jButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
/**************SCRIVERE QUI IL NOME DEL FILE CON L'IMMAGINE DA CARICARE*******************/
filename = "reference table player2.gif";
java.net.URL imgURL = DMToolz.class.getResource("images/"+filename);
BufferedImage img = null;
try {
img = ImageIO.read(imgURL);
w = img.getWidth();
h = img.getHeight();
System.out.println("*DM* Immagine letta - W:"+w+" H:"+h);
} catch (Exception ex) {System.out.println("*DM* Immagine non letta");}
JApplet a = new Apple();
a.setName(filename);
JFrame f = new JFrame ("UrcaBBestia!");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
f.getContentPane().add(a);
f.setPreferredSize( new Dimension(w,h+30) );//30 � (circa) l'altezza della barra del titolo del frame
f.pack();
f.setVisible(true);
return jButton;
public class Apple extends JApplet {
private static final long serialVersionUID = 1L;
final static Color bg = Color.white;
final static Color fg = Color.black;
final static Color red = Color.red;
final static Color white = Color.white;
public void init() {
//Initialize drawing colors
setBackground(bg);
setForeground(fg);
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
try {
String filename = this.getName(); //uso il nome dell'applet come riferimento al nome del file da caricare
java.net.URL imgURL = DMToolz.class.getResource("images/"+filename);
BufferedImage img = ImageIO.read(imgURL);
if (img.equals(null)) {System.out.println("IMG null!");System.exit(0);}
System.out.println("IMG letta");
int w = img.getWidth();
int h = img.getHeight();
resize(w,h);
g2.drawImage(img,
0,0,Color.LIGHT_GRAY,
null);// no ImageObserver
} catch (Exception ex) {ex.printStackTrace();
System.out.println("Immagine non letta.");System.exit(0);}
}//end classPlease never mind about some italian text, used as reminder....
Thanks in advance.Read the Swing tutorial on "How to Use Labels" or "How to Use Icons" for working examples:
http://java.sun.com/docs/books/tutorial/uiswing/TOC.html
By the way you should never override the paint() method. Custom painting (not required in this case) is done by overriding the paintComponent(...) method in Swing. Overriding paint() is an old AWT trick. -
I was just wondering if there is a way to center images displayed in an applet?
you could try: myImage.setLocation((myApplet.getWidth()-myImage.getWidth())/2, (myApplet.getHeight()-myImage.getHeight())/2);
-
i used the following code to save a image it displays from applet.it works fine in appletviewer
BufferedImage expImage = new BufferedImage( (int)this.getWidth(), (int)this.getHeight(), BufferedImage.TYPE_INT_RGB );
Graphics g2d = expImage.getGraphics();
// draftGrid.update(g2d);
this.update(g2d);
g2d.dispose();
OutputStream out = new FileOutputStream( "guru.jpg");
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(expImage);
out.flush();
out.close();
expImage.flush();
but when i run it in html through my web server the image does' get saved and it the exception i go is
Status code:404 request:R( j
ava/awt/image/BufferedImage.class + null) msg:null
what should i go to save a image from applet throgh browserHello,
This is what I am doing through a servlet call.
If you are just going to let the user download the image you could try the following:
// This works if we are just going to download the image as is
URL url = new URL(request.getParameter("imageURL"));
response.setContentType("image/gif");
response.setHeader("Content-Disposition", "attachment; "+
"filename=\"image.gif\"");
byte buf[] = new byte[1024];
InputStream inputStream = url.openStream();
ServletOutputStream out = response.getOutputStream();
//Read and Write
while(inputStream.read(buf) != -1)
out.write(buf);
out.flush();
out.close();
Or if you are going to manipulate the image a bit before they download it you could try the following:
URL url = new URL(request.getParameter("imageURL"));
response.setContentType("image/gif");
response.setHeader("Content-Disposition", "attachment; "+
"filename=\"image.gif\"");
// use ImageIcon because we are getting the image from a
// URL which might be slow - it has the MediaTracker built right in
javax.swing.ImageIcon ii = new javax.swing.ImageIcon(url);
Image image = ii.getImage(); // now the pixel data is in memory
// get the height and width of the loaded image
int width = image.getWidth(null);
int height = image.getHeight(null);
// create a rectangle as big as the image
Rectangle drawRect = new Rectangle(10, 10, width, height);
BufferedImage bufImage = new BufferedImage(width,
height, BufferedImage.TYPE_INT_RGB);
// get the graphics so you can draw on it
Graphics2D g = bufImage.createGraphics();
// create a nicce white background for the image
g.setColor(Color.white);
g.fillRect(0, 0, width, height);
// reset the color
g.setColor(Color.black);
// add the image
g.drawImage(image, 0, 0, null);
// add any other things you want as well
g.drawString("Just a string", 10, 10);
// create the output stream
ServletOutputStream out = response.getOutputStream();
JPEGImageEncoder jpegImageEncoder = JPEGCodec.createJPEGEncode(out);
// encode it
jpegImageEncoder.encode(bufImage);
out.flush();
out.close();
Hope that this helps.
Mike -
Pb displaying image in a canva with jpg format
I have an applet that displays images in a canva by pushing buttons. It works very well with gif image but bad with jpg image.
Coincidence or not ? I don't know.
What I know that I use the same method painting jpg or gif image
(first changing image name then calling mycanva.validate() and mycanva.repaint() and of course mycanva paint method contains g.drawimage(myimage,0,0,200,200,this) )
With jpg image what happens is the image is not completly painted (sometime half painted, sometime less than half painted) and if I do reload the browser the image is very well displayed...
has someone an idea ?
many thankstry your app on another computer and see if it does the same thing. I had a very similar problem and it turned out to be my video driver was not driving my video properly. I changed/updated the video driver and my problems were totally solved.
-
Displaying image on the button
hi there,
well i wanna display image on my applet button from the relative path how do i do.
here is my code which i tried gave me nullpointer exception and i did put this code my applets constructor:
URL url1 = new URL(getDocumentBase().toString()+"b.gif");
ImageIcon image1 = new ImageIcon(url1);
JButton button = new JButton(image1);SanderSander
the code u have given failed to work well here is the code which i tried :
ImageIcon image1 = new ImageIcon(getImage(getCodeBase(),"b.gif"));
JButton button = new JButton(image1);
and here is the html code for applet :
<!--"CONVERTED_APPLET"-->
<!-- CONVERTER VERSION 1.3 -->
<SCRIPT LANGUAGE="JavaScript"><!--
var info = navigator.userAgent; var ns = false;
var ie = (info.indexOf("MSIE") > 0 && info.indexOf("Win") > 0 && info.indexOf("Windows 3.1") < 0);
//--></SCRIPT>
<COMMENT><SCRIPT LANGUAGE="JavaScript1.1"><!--
var ns = (navigator.appName.indexOf("Netscape") >= 0 && ((info.indexOf("Win") > 0 && info.indexOf("Win16") < 0 && java.lang.System.getProperty("os.version").indexOf("3.5") < 0) || (info.indexOf("Sun") > 0) || (_info.indexOf("Linux") > 0)));
//--></SCRIPT></COMMENT>
<SCRIPT LANGUAGE="JavaScript"><!--
if (_ie == true) document.writeln('<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93" WIDTH = "500" HEIGHT = "300" codebase="http://java.sun.com/products/plugin/1.3/jinstall-13-win32.cab#Version=1,3,0,0"><NOEMBED><XMP>');
else if (_ns == true) document.writeln('<EMBED type="application/x-java-applet;version=1.3" CODEBASE="http://192.168.1.50/paddy/ns/ns" CODE = "GPTextEditor" MAYSCRIPT="true" WIDTH = "500" HEIGHT = "300" scriptable=false pluginspage="http://java.sun.com/products/plugin/1.3/plugin-install.html"><NOEMBED><XMP>');
//--></SCRIPT>
<APPLET CODE = "GPTextEditor" WIDTH = "500" HEIGHT = "300"></XMP>
<PARAM NAME = CODE VALUE = "GPTextEditor" >
<PARAM NAME = CODEBASE VALUE = "http://192.168.1.50/paddy/ns/ns" >
<PARAM NAME=MAYSCRIPT VALUE=TRUE>
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.3">
<PARAM NAME="scriptable" VALUE="true">
</APPLET>
</NOEMBED></EMBED></OBJECT>
i m using swing applet..... -
How to display image in JFrame
i am comfortable with displaying an image in applets ,but i am not able to display image in JFrames
i used Image img=getImage(getDocumentBase(),"sample.jpg");its displaying an error cant find symbol getDocumentBase()It is a method of Applet. If you have a question of what methods
are available in a given class, the very first thing you should do is check the API:
http://java.sun.com/javase/6/docs/api/
Take a look at the code in reply #2: http://forum.java.sun.com/thread.jspa?threadID=5152350 -
Looking for Image Button Applet
I'm looking for a simple image button applet (normal state, mouse-over and mouse-click) which can refer to a HTML or start a Javascript function. Can anyone help?
KippieHi,
This is the source code. I don't quite understand what I should do with the tokens. I hope this is allright. Thanks for your help
Kippie.
import java.net.URL;
import java.awt.Color;
import java.util.Vector;
import java.util.Enumeration;
import java.util.StringTokenizer;
import java.applet.Applet;
import java.applet.AudioClip;
Program Name: ImageURLButtonBar
Author: Paul Whitelock
Version: 1.1
Copyright: (c) 1997 by Paul Whitelock and Modern Minds, Inc.
Requires: ImageURLButtonBar.class
ButtonBar.class
ButtonBarObserver.class (Interface definition)
ButtonRegion.class
ButtonAnimate.class
Modifications: v1.01 (15 April 97)
* Added "sticky" button behavior (controlled
by applet "stick" parameter)
v1.03 (25 June 97)
* Added applet parameter "useCodeBase". If useCodeBase
is true, then image file locations will be based on the directory
in which the Java class files are located. If useCodeBase is false, then
the locations will be based on the HTML directory. Note that audio
file locations are always based on the Java directory. The default
for useCodeBase is false (use HTML directory for base).
* The "stick" parameter will now accept a button number in
addition to the value of "true" or "false". If a button number
is specified, then that button will be "stuck" down
when the button bar initializes.
* Added the capability of loading multiple URLs for each button
with an optional target for each URL.
v1.1 (25 September 97)
* Added "baseBrighten" and "baseBrightenTint" parameters to control
highlighting for base button bar.
* Added "mouseOverBrighten" and "moBrightenTint" parameters to control
highlighting for base button bar.
* Added "mdBrightenTint" and "mdBrightenAll" parameters to control
highlighting for base button bar. Previous versions of the applet
supported "mouseDownBrighten," but only if button borders were not
drawn for the button-down button bar (the "mdBrightenAll" can be set
to "true" to override the this default behavior).
* An "appletBGColor" parameter has been added to set the
applet background color. The applet background color is
sometimes visible during scrolling or during a page repaint.
NOTE: This source code was composed using Microsoft Visual J++
with tab stops of 4. Text may not be formatted correctly
if another editor is used.
******************************** PARAMETERS ********************************
Applet Parm ButtonBar Class Parm Default Value
================== ======================= ==================
appletBGColor
disableBadURL true
mouseEnterAudio null (audio disabled)
mouseClickAudio null (audio disabled)
buttonDownAudio null (audio disabled)
stick false
* useCodeBase base false (i.e., use getDocumentBase())
orient barHorizontal horizontal if applet width > height
base baseBarName none - parameter REQUIRED
mouseOver mouseOverBarName null
mouseOver2 mouseOverBar2Name null
mouseDown mouseDownBarName null
mouseDownOver mouseDownOverBarName null
buttonsDisabled buttonsDisabledBarName null
background backgroundImageName null
barXPos barXBackgroundPos 0
barYPos barYBackgroundPos 0
buttonBorders drawButtonBorders ButtonBar.BORDERS_NONE
borderColorTL borderColorTopLeft null (Color.white if error)
borderColorBR borderColorBottomRight null (Color.gray if error)
borderIntensity borderIntensityPercent 50 (used only if borders)
borderSize buttonBorderSize 1 (used only if borders)
downShift downShift false
downShiftAmt downShiftAmt buttonBorderSize
baseBrighten baseBrightenPct
baseBrightenTint baseBrightenTint
mouseOverBrighten mouseOverBrightenPct
moBrightenTint mouseOverBrightenTint
mouseDownBrighten mouseDownBrightenPct
mdBrightenTint mouseDownBrightenTint
mdBrightenAll mouseDownBrightenAll
buttonsDisabledDim buttonsDisabledDimPct 25 (used only if no buttonsDisabled)
grayBarBrighten grayBarBrighten 0
frameRate frameRate 150 (used only if mouseOver2)
* If useCodeBase is true, then all file locations are based on the Java class file
directory (i.e., use getCodeBase()).
public class ImageURLButtonBar extends Applet implements ButtonBarObserver {
// Instance Variables
ButtonBar buttonBar;
Vector buttonURL = new Vector(10, 10);
Vector buttonURLTarget = new Vector(10, 10);
Vector buttonDescription = new Vector(10, 10);
AudioClip mouseEnterAudio = null;
AudioClip mouseClickAudio = null;
AudioClip buttonDownAudio = null;
// Applet Initialization
public void init() {
// =================================================================
// Applet ImageURLButtonBar specific parameters
// =================================================================
// appletBGColor
// Set applet background color
String parm = getParameter("appletBGColor");
if (parm != null) {
try {
setBackground(new Color(Integer.parseInt(parm, 16)));
catch (Exception e) {
reportError("appletBGColor");
// disableBadURL
// If true, then any button with an invalid URL will be disabled
parm = getParameter("disableBadURL");
boolean disableBadURL;
if (parm == null || !parm.equals("false")) disableBadURL = true;
else disableBadURL = false;
// mouseEnterAudio
// Sound to play each time the mouse enters any of the buttons
parm = getParameter("mouseEnterAudio");
if (parm != null) {
mouseEnterAudio = getAudioClip(getCodeBase(), parm);
if (mouseEnterAudio == null) reportError("Can't load " + parm);
// mouseClickAudio
// Sound to play each time a mouse down click occurs in a button
parm = getParameter("mouseClickAudio");
if (parm != null) {
mouseClickAudio = getAudioClip(getCodeBase(), parm);
if (mouseClickAudio == null) reportError("Can't load " + parm);
// buttonDownAudio
// Sound to play each time a mouse up occurs in a button (i.e, the
// button has be toggled through it's "down" position)
parm = getParameter("buttonDownAudio");
if (parm != null) {
buttonDownAudio = getAudioClip(getCodeBase(), parm);
if (buttonDownAudio == null) reportError("Can't load " + parm);
// stickyBar
// If the "stick" applet parameter is "true", then buttons will stay
// "stuck" in the down position until another button is clicked.
// If the "stick" applet parameter is the number of a button in the
// button bar, then that button will be "stuck" down when the
// button bar initializes.
int stickyBar = -1;
parm = getParameter("stick");
if (parm != null && !parm.toLowerCase().equals("false")) {
try {
stickyBar = Integer.parseInt(parm);
catch (Exception e) {
stickyBar = 0;
// =================================================================
// Class ButtonBar specific parameters
// =================================================================
// orient (barHorizontal)
// If this parameter = 'h' then the button bar is horizontal
// If this parameter = 'v' then the button bar is vertical
// If this parameter is not specified, then the button bar is
// horizontal if the applet width is greater than the applet height
boolean horizontal;
parm = getParameter("orient");
if (parm == null) horizontal = size().width > size().height;
else horizontal = parm.equals("h") ? true : false;
// base (baseBarName)
// The base image file for the buttons. This is the only image
// file that MUST be specified.
String baseBar = getParameter("base");
if (baseBar == null) {
reportError("Parameter 'base' REQUIRED!");
return;
// barXPos (barXBackgroundPos)
// barYPos (barYBackgroundPos)
// If a background image is specified then these to parameters
// represent the top-left corner location where the button bar
// should be placed on the background
int barXPos = 0, barYPos = 0;
try {
parm = getParameter("barXPos");
if (parm != null) barXPos = Integer.parseInt(parm);
parm = getParameter("barYPos");
if (parm != null) barYPos = Integer.parseInt(parm);
catch (Exception e) {
reportError("barXPos or barYPos");
barXPos = barYPos = 0;
// buttonBorders (drawButtonBorders)
// "none" = do not draw any button borders
// "all" = draw borders around all button bar buttons
// "base" = draw borders only around buttons on base button bar
// "other" = draw borders around all button bar buttons EXCEPT base button bar buttons
parm = getParameter("buttonBorders");
int drawButtonBorders = ButtonBar.BORDERS_NONE;
if (parm != null) {
if (parm.equals("base")) drawButtonBorders = ButtonBar.BORDERS_BASE;
else if (parm.equals("other")) drawButtonBorders = ButtonBar.BORDERS_OTHER;
else if (parm.equals("all")) drawButtonBorders = ButtonBar.BORDERS_ALL;
// borderColorTL (borderColorTopLeft)
// borderColorBR (borderColorBottomRight)
// Normally, borders are drawn around buttons by lightening or darkening
// the image in the border region. A specific color can be used instead
// for the top and left borders and/or the bottom and right borders. The
// value specified for either of these two parameters should be a hexadecimal
// number (e.g., "FF0000" for red, "888888" for medium gray, etc.).
Color borderColorTopLeft = null;
Color borderColorBottomRight = null;
try {
parm = getParameter("borderColorTL");
if (parm != null) borderColorTopLeft = new Color(Integer.parseInt(parm, 16));
parm = getParameter("borderColorBR");
if (parm != null) borderColorBottomRight = new Color(Integer.parseInt(parm, 16));
catch (Exception e) {
reportError("borderColorTL or borderColorBR");
borderColorTopLeft = Color.white;
borderColorBottomRight = Color.gray;
// borderIntensity (borderIntensityPercent)
// If borders are drawn for buttons, and if a border color is not specified
// (see above), then the image in the border region will be lightened or
// darkened by this percentage to create the borders.
int borderIntensityPercent = 50;
try {
parm = getParameter("borderIntensity");
if (parm != null) borderIntensityPercent = Integer.parseInt(parm);
catch (Exception e) {
reportError("borderIntensity");
borderIntensityPercent = 50;
// borderSize (buttonBorderSize)
// The size of borders, if borders are specified.
int buttonBorderSize = 1;
try {
parm = getParameter("borderSize");
if (parm != null) buttonBorderSize = Integer.parseInt(parm);
catch (Exception e) {
reportError("borderSize");
// downShift
// If true, then the button image is shift down and right downShiftAmt
// (see below) pixels when the mouse is clicked on the button.
parm = getParameter("downShift");
boolean downShift = (parm == null || !parm.equals("true")) ? false : true;
// downShiftAmt
// If downShift is true, then the button image is shift down and right
// downShiftAmt (see above) pixels when the mouse is clicked on the button.
int downShiftAmt = buttonBorderSize;
try {
parm = getParameter("downShiftAmt");
if (parm != null) downShiftAmt = Integer.parseInt(parm);
catch (Exception e) {
reportError("downShiftAmt");
// baseBrighten (baseBrightenPct)
// The base bar will be lightened by this percentage
int baseBrightenPct = 0;
try {
parm = getParameter("baseBrighten");
if (parm != null) baseBrightenPct = Integer.parseInt(parm);
catch (Exception e) {
reportError("baseBrighten");
// mouseOverBrighten (mouseOverBrightenPct)
// A button will be lightened by this percentage when the mouse
// moves over a button.
int mouseOverBrightenPct = 0;
try {
parm = getParameter("mouseOverBrighten");
if (parm != null) mouseOverBrightenPct = Integer.parseInt(parm);
catch (Exception e) {
reportError("mouseOverBrighten");
// mdBrightenAll (mouseDownBrightenAll)
// A button will be lightened by this percentage when the mouse
// moves over a button.
boolean mouseDownBrightenAll = false;
parm = getParameter("mdBrightenAll");
if (parm != null && parm.charAt(0) == 't') mouseDownBrightenAll = true;
// mouseDownBrighten (mouseDownBrightenPct)
// A button will be lightened by this percentage when it is
// clicked.
int mouseDownBrightenPct = 0;
try {
parm = getParameter("mouseDownBrighten");
if (parm != null) mouseDownBrightenPct = Integer.parseInt(parm);
catch (Exception e) {
reportError("mouseDownBrighten");
// baseBrightenTint (mouseOverBrightenTint)
// moBrightenTint (mouseOverBrightenTint)
// mdBrightenTint (mouseDownBrightenTint)
Color baseBrightenTint = null;
Color mouseOverBrightenTint = null;
Color mouseDownBrightenTint = null;
try {
parm = getParameter("baseBrightenTint");
if (parm != null) baseBrightenTint = new Color(Integer.parseInt(parm, 16));
parm = getParameter("moBrightenTint");
if (parm != null) mouseOverBrightenTint = new Color(Integer.parseInt(parm, 16));
parm = getParameter("mdBrightenTint");
if (parm != null) mouseDownBrightenTint = new Color(Integer.parseInt(parm, 16));
catch (Exception e) {
reportError("baseBrightenTint, moBrightenTint or mdBrightenTint");
// buttonsDisabledDim (buttonsDisabledDimPct)
// If a button is disabled and if there is no buttonsDisabled image,
// then the button will be dimmed by this percentage.
int buttonsDisabledDimPct = 25;
try {
parm = getParameter("buttonsDisabledDim");
if (parm != null) buttonsDisabledDimPct = Integer.parseInt(parm);
catch (Exception e) {
reportError("buttonsDisabledDim");
// grayBarBrighten
// If there is no mouseOver image, then the base image will be used for
// the mouseOver image, and a grayscale version of the base image will
// be used for base button images. This parameter can be used to lighten
// COLORS (not grays) in the image before it is converted to grayscale.
// This can help if the standard conversion produces buttons that are
// too dark.
int grayBarBrighten = 0;
try {
parm = getParameter("grayBarBrighten");
if (parm != null) grayBarBrighten = Integer.parseInt(parm);
catch (Exception e) {
reportError("grayBarBrighten");
// frameRate
// If a mouseOver2 image is specified, then this parameter controls
// how quickly animation will be performed (using mouseOver and mouseOver2
// images) in milliseconds when the mouse is moved over a button.
int frameRate = 150;
try {
parm = getParameter("frameRate");
if (parm != null) frameRate = Integer.parseInt(parm);
catch (Exception e) {
reportError("frameRate");
// =================================================================
// Instantiate the button bar
// =================================================================
try {
// Allow the use of documentBase (default) or codeBase for image file
// base directory.
URL documentBase;
parm = getParameter("useCodeBase");
if (parm == null || parm.equals("false")) documentBase = getDocumentBase();
else documentBase = getCodeBase();
// Create the button bar
buttonBar = new ButtonBar(
horizontal, /* barHorizontal */
documentBase, /* base */
baseBar, /* baseBarName */
getParameter("mouseOver"), /* mouseOverBarName */
getParameter("mouseOver2"), /* mouseOverBar2Name */
getParameter("mouseDown"), /* mouseDownBarName */
getParameter("mouseDownOver"), /* mouseDownOverBarName */
getParameter("buttonsDisabled"),/* buttonsDisabledBarName */
getParameter("background"), /* backgroundImageName */
barXPos, /* barXBackgroundPos */
barYPos, /* barYBackgroundPos */
drawButtonBorders, /* drawButtonBorders */
borderColorTopLeft, /* borderColorTopLeft */
borderColorBottomRight, /* borderColorBottomRight */
borderIntensityPercent, /* borderIntensityPercent */
buttonBorderSize, /* buttonBorderSize */
downShift, /* downShift */
downShiftAmt, /* downShiftAmt */
baseBrightenPct, /* baseBrightenPct */
baseBrightenTint, /* baseBrightenTint */
mouseOverBrightenPct, /* mouseOverBrightenPct */
mouseOverBrightenTint, /* mouseOverBrightenTint */
mouseDownBrightenAll, /* mouseDownBrightenAll */
mouseDownBrightenPct, /* mouseDownBrightenPct */
mouseDownBrightenTint, /* mouseDownBrightenTint */
buttonsDisabledDimPct, /* buttonsDisabledDimPct */
grayBarBrighten, /* grayBarBrighten */
frameRate /* frameRate */
// =================================================================
// Add buttons to the button bar
// =================================================================
ButtonRegion buttonToAdd;
String buttonNbr, urlString;
URL urlForButton;
int nbr = 0;
int buttonStart, buttonSize;
// Initialize button on bar flag (used to determine if at least one button
// was successfully added to the button bar)
boolean buttonOnBar = false;
// This loop will be exited when no more buttons can be found in the HTML
while (true) {
// Construct the prefix for the button parameters
buttonNbr = "button" + ++nbr;
// Find the starting offset and the size of the button
// If null is returned as the starting offset parameter value for the
// button, then all buttons should have been read so the loop can
// be exited.
try {
parm = getParameter(buttonNbr + "Start");
if (parm == null) break;
buttonStart = Integer.parseInt(parm);
buttonSize = Integer.parseInt(getParameter(buttonNbr + "Size"));
catch (Exception e) {
reportError("Button" + nbr + " start or size in error or missing");
buttonStart = 0;
buttonSize = 0;
// Create a ButtonRegion for the button
// The button ID will be set to the number of the button (this will
// be converted to an integer later when a buttonBarEvent is received).
buttonToAdd = new ButtonRegion("" + nbr, buttonStart, buttonSize);
// If the buttons on this button bar are "sticky" buttons, then
// enable "sticky" behavior for this button. The button will always
// "pop-up" whenever another button is clicked.
if (stickyBar >= 0) {
buttonToAdd.stickyButton(true, ButtonRegion.POPUP_ALWAYS, false);
// If the current button number matches the value of stickyBar, then the
// current button should be "stuck" down for its initial state.
if (stickyBar == nbr) buttonToAdd.setStuck(true);
// Try to add the button (i.e., the ButtonRegion) to the buttonBar
if (buttonBar.addButton(buttonToAdd)) {
// Set flag to indicate that at least one button has been added
buttonOnBar = true;
// The button was successfully added, so save the button's description
// (which will be displayed in the status bar) and the target frame
// for the button URL in the appropriate Vector.
buttonDescription.addElement(getParameter(buttonNbr + "Desc"));
buttonURLTarget.addElement(getParameter(buttonNbr + "Target"));
// Try to create a URL for the button.
// If the URL is invalid, then place an error message in the
// buttonURLTarget Vector (this will be used to warn the user
// when the button is clicked). Also, if disableBadURL is true, then
// disable the button.
String theURL;
urlString = getParameter(buttonNbr + "URL");
if (urlString != null) {
Enumeration urls = new StringTokenizer(urlString);
while (urls.hasMoreElements()) {
theURL = (String)urls.nextElement();
try {
urlForButton = new URL(theURL);
catch (Exception e) {
try {
urlForButton = new URL(getDocumentBase(), theURL);
catch (Exception e2) {
reportError("Button" + nbr + " has invalid URL");
buttonURLTarget.setElementAt("Invalid URL", nbr - 1);
urlString = null;
break;
else {
reportError("Button" + nbr + " has no URL");
buttonURLTarget.setElementAt("No URL", nbr - 1);
buttonURL.addElement(urlString);
// Remove any unused elements in the Vectors
buttonURL.trimToSize();
buttonURLTarget.trimToSize();
buttonDescription.trimToSize();
// If no buttons were added, throw exception
if (!buttonOnBar) throw new IllegalArgumentException("No buttons on bar");
// Let the buttonBar know that all buttons have been defined. This is
// really only necessary if downShift is true, but it won't hurt calling
// the method in either case.
buttonBar.allButtonsDefined();
// Add the applet as an observer so that the applet will be notified
// when button events occur.
buttonBar.addButtonObserver(this);
// Enable the button bar now that all buttons have been defined.
// (the buttonBar is disabled when it is created and must be
// specifically enabled).
buttonBar.enable(true);
// Add the buttonBar to the applet
setLayout(null);
add(buttonBar);
catch (Exception e) {
reportError("Can't create ButtonBar\n" + e);
// buttonBarEvent
// This method is called by the ButtonBar whenever a button event occurs
// It provides the ButtonBar that the event occurred for, the button ID
// that the event occurred for, and the event type.
public void buttonBarEvent(ButtonBar barID, String buttonID, int buttonEvent) {
String description;
// The buttonBar will send an IMAGES_READY event when all button bar images
// have been prepared. We are not interested in this event, but only in
// certain "action" events that occur for a button.
if (buttonEvent != ButtonBar.IMAGES_READY) {
// A number in String format was assigned as the buttonID when each
// ButtonRegion was created. The buttonID String will now be converted
// back into a number that can be used as a Vector index to retrieve
// button specific information (i.e., URL, target frame, and description).
int buttonNbr = Integer.parseInt(buttonID) - 1;
switch (buttonEvent) {
// If a mouseDown event has occurred for the button, and if an
// AudioClip is available for this event, play the AudioClip.
case ButtonBar.MOUSE_CLICK:
if (mouseClickAudio != null) mouseClickAudio.play();
break;
// If the mouse has been moved over a button, display the button's
// description in the browser's status area. If the button that the mouse
// is over is an active button, and if there is an AudioClip available
// for this event, then play the audio clip.
case ButtonBar.MOUSE_ENTER:
case ButtonBar.MOUSE_ENTER_DISABLED:
description = (String)buttonDescription.elementAt(buttonNbr);
if (description != null) showStatus(description);
if (mouseEnterAudio != null && buttonEvent == ButtonBar.MOUSE_ENTER) {
mouseEnterAudio.play();
break;
// If the mouse has been moved off of a button and if the button has
// description text associated with it, then clear the browser's
// browser's status area.
case ButtonBar.MOUSE_EXIT:
case ButtonBar.MOUSE_EXIT_DISABLED:
description = (String)buttonDescription.elementAt(buttonNbr);
if (description != null) showStatus("");
break;
// If the button has been depressed (i.e., a mouseDown followed by
// a mouseUp for the same button) then load the URL(s) for the button
// in the target frame(s), if specified. If the URL is null, then the
// URL was found to be missing or invalid, so display the text stored in
// the buttonURLTarget Vector in the brower's status area. If there is
// an AudioClip for the event, play the audio.
case ButtonBar.BUTTON_DOWN:
// Get the string of URLs and Targets for the button
String urlString = (String)buttonURL.elementAt(buttonNbr);
String targetString = (String)buttonURLTarget.elementAt(buttonNbr);
// If there is at least one URL for the button
if (urlString != null) {
URL urlForButton;
String theURL;
String theTarget;
Enumeration urls = new StringTokenizer(urlString);
Enumeration targets = null;
if (targetString != null) targets = new StringTokenizer(targetString);
// While there is another URL for the button
while (urls.hasMoreElements()) {
// Get the next String token that represents a URL
theURL = (String)urls.nextElement();
// Convert the String to a URL
try {
urlForButton = new URL(theURL);
catch (Exception e) {
try {
urlForButton = new URL(getDocumentBase(), theURL);
catch (Exception e2) {
urlForButton = null;
break;
// If the String was successfully convert to a URL
if (urlForButton != null) {
// If there is a target for this URL
if (targets != null && targets.hasMoreElements()) {
// Get the String that represents the target
theTarget = (String)targets.nextElement();
// If the target String does NOT begin with a "-",
// then load the URL in the target
if (theTarget.charAt(0) != '-') {
getAppletContext().showDocument(urlForButton, theTarget);
// Else a target for this URL should not be used
else {
getAppletContext().showDocument(urlForButton);
// Else there is no target for this URL, so just show
// the URL.
else {
getAppletContext().showDocument(urlForButton);
// Else URL is missing or invalid
else showStatus((String)buttonURLTarget.elementAt(buttonNbr));
if (buttonDownAudio != null) buttonDownAudio.play();
break;
// Error reporting
private void reportError(String message) {
message = "[ImageURLButtonBar] Error - " + message;
System.out.println(message);
showStatus(message);
} -
Open and display image in MVC layout
Hello!
I cant figure out how I shall do this in an MVC layout:
The program request user to open an image file that are then displayed in a JLabel
My setup at the moment resolve in a nullpointerexeption because it dont get any actual image file, but I dont understand what I have missed.
I can not post the whole code fo you to run because it is to big, so I post the part that are the most important. please have a look.
PicturePanel
//Import Java library
import javax.swing.*;
import java.awt.*;
public class PicturePanel extends JPanel {
//Variables
private ImageIcon picture;
//Method to get information of the selected file
PicturePanel (String fileName) {
picture = new ImageIcon (fileName); //Get the filename
int w = picture.getIconWidth(); //Get the image with
int h = picture.getIconHeight(); //Get the image height
//Set preferable size for the image (Use the properties for the selected image)
setPreferredSize(new Dimension(w, h));
setMinimumSize(new Dimension(w, h));
setMaximumSize(new Dimension(w, h));
//Method to draw the selected image
protected void paintComponent(Graphics g) {
super.paintComponent(g); //We invoke super in order to: Paint the background, do custom painting.
g.drawImage(picture.getImage(), 0, 0, this); //Draw the image at its natural state
}From my model:
//Local attributes
boolean check = false; //Used to see if a statement is true or not
PicturePanel pp;
JFileChooser fc;
int returnVal;
//newFile in File menu
public void newFile() {
//Open a file dialog in users home catalog
fc = new JFileChooser();
//In response to a button click:
returnVal = fc.showOpenDialog(pp);
System.out.println("You pressed new in file menu");
}From my controler:
//User press "New" in File menu
else if (user_action.equals("New")) {
//Call method in model class
model.newFile();
//Update changes
if (model.returnVal == JFileChooser.APPROVE_OPTION) {
System.out.println("Hello1");
File f = model.fc.getSelectedFile();
if (model.pp != null)
model.pp = new PicturePanel(f.getAbsolutePath());
System.out.println("Hello2");
//Display image (Here is line 83)
view.setImage_DisplayArea(model.pp);
System.out.println("Hello3");
}From my view:
//Sets the image to be displayed on the image_display area (Here is line 302)
public void setImage_DisplayArea(PicturePanel pp) {
image_display.add(pp);
}The complet error:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.awt.Container.addImpl(Container.java:1015)You pressed new in file menu
Hello1
Hello2
at java.awt.Container.add(Container.java:351)
at View_Inlupp2.setImage_DisplayArea(View_Inlupp2.java:302)
at Control_Inlupp2.actionPerformed(Control_Inlupp2.java:83)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1882)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2202)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.AbstractButton.doClick(AbstractButton.java:334)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1050)
at apple.laf.CUIAquaMenuItem.doClick(CUIAquaMenuItem.java:119)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1091)
at java.awt.Component.processMouseEvent(Component.java:5602)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3129)
at java.awt.Component.processEvent(Component.java:5367)
at java.awt.Container.processEvent(Container.java:2010)
at java.awt.Component.dispatchEventImpl(Component.java:4068)
at java.awt.Container.dispatchEventImpl(Container.java:2068)
at java.awt.Component.dispatchEvent(Component.java:3903)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4256)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3936)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3866)
at java.awt.Container.dispatchEventImpl(Container.java:2054)
at java.awt.Window.dispatchEventImpl(Window.java:1801)
at java.awt.Component.dispatchEvent(Component.java:3903)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:176)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)Edited by: onslow77 on Dec 16, 2009 5:00 PM
Edited by: onslow77 on Dec 16, 2009 5:04 PMHello again!
Anyone that can help me figure out how to implement this in an MVC layout, I feel stuck.
I post a little program that open and display an image file so that you better can understand what I whant to do.
ShowImage
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import javax.swing.filechooser.*;
public class ShowImage extends JFrame{
//Variables
JFileChooser fc = new JFileChooser();
PicturePanel pp = null;
ShowImage () {
super("Show"); //Title
//Create the GUI
JPanel top = new JPanel();
add(top, BorderLayout.NORTH);
JButton openBtn = new JButton("Open");
top.add(openBtn);
openBtn.addActionListener(new Listner());
//Settings for the GUI
setDefaultCloseOperation(EXIT_ON_CLOSE);
pack();
setVisible(true);
class Listner implements ActionListener {
public void actionPerformed(ActionEvent ave) {
int answer = fc.showOpenDialog(ShowImage.this);
if (answer == JFileChooser.APPROVE_OPTION){
File f = fc.getSelectedFile();
//Check
System.out.println(f);
System.out.println(pp);
if (pp != null)
remove(pp); //Clean so that we can open another image
//Check
System.out.println(pp);
//Set the PicturePanel
pp = new PicturePanel(f.getAbsolutePath());
//Check
System.out.println(pp);
//Add PicturePanel to frame
add(pp, BorderLayout.CENTER);
validate();
pack();
repaint();
//Main
public static void main(String[] args) {
new ShowImage();
}PicturePanel
//Import Java library
import javax.swing.*;
import java.awt.*;
public class PicturePanel extends JPanel {
//Variables
private ImageIcon picture;
//Method to get information of the selected file
PicturePanel (String fileName) {
picture = new ImageIcon (fileName); //Get the filename
int w = picture.getIconWidth(); //Get the image with
int h = picture.getIconHeight(); //Get the image height
//Set preferable size for the image (Use the properties for the selected image)
setPreferredSize(new Dimension(w, h));
setMinimumSize(new Dimension(w, h));
setMaximumSize(new Dimension(w, h));
//Method to draw the selected image
protected void paintComponent(Graphics g) {
super.paintComponent(g); //We invoke super in order to: Paint the background, do custom painting.
g.drawImage(picture.getImage(), 0, 0, this); //Draw the image at its natural state
}//The endEdited by: onslow77 on Dec 16, 2009 7:30 PM -
Hi everyone, I am a newbie for labview. I just wanna ask you about image display in labview. Now I can display one image in my front panel. I open the file path and display it. First thing I wanna do is that is it possible to display on monitor full screen not on front panel and second thing is that how can I display images in folder and display it about 2 seconds delay in between? Pls kindly help me.
Thanks millions.
Solved!
Go to Solution.Hi there,
-I don't know whether the image full display can be possible or not, Any reason why you are asking for such requirement?
-The other question about reading files in a folder and display for 2sec can be done like shown in image.
-I've attached vi in lv 12 if needed.
-Next time, please post your vision related queries in Machine vision Board.
Thanks
uday,
Please Mark the solution as accepted if your problem is solved and help author by clicking on kudoes
Certified LabVIEW Associate Developer (CLAD) Using LV13
Attachments:
Image_read_folder.vi 43 KB
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