Swing Component to access a Servlet

Hi All,
I am new to the technology of java and servlets.
We have a Web Application which runs on the JSP and Servlet technology using a BEA Weblogic Server.
User(Client) connects to the server with Login.jsp by providing a valid user-name . The server in returns downloads an Applet from the server . From here-onwards all communications to the server happens via the applet.
What I want to do is that, I don't want to communicate to the server using the browser and then through applet. Instead I want to write my own application using AWT/SWING and then connect to the server using java.net class.
I have the code of the Applet and hence I can duplicate it's functionality in "MyApplication".
Since I have very less experience, in Java related technologies , I just thought I will introduce my idea in this forum. Is this doable. How should I start to get ahead in this. Since the servlets keep throwing HTMLS will I be able to parse them in some so that I can make similar kind of GUI as it comes in the browser window?
Any information with this regards will be apprecaited.
Regards,
Amol

Hi Jamie,
Thanks a lot for the quick response.
My my main question is that are Desktop softwares written to communicate with Web Application Servers.
is it a workable solution.Are softwares written in that fashion.
Also how can I call COM server APIs from Java.
Warm Wishes,
Amol

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Flicker with heavyweight swing component and setVisible(false) on Linux

Hi All,
I'm using Java 6 update 14 on Ubuntu Jaunty.
I'm developing a GUI for a system running linux. I'm using the Swing framework for the GUI but need to include 3D animation accelerated in hardware. I'm using the JOGL framework for applying the 3D animations which supplies one with two swing-like components, the GLJPanel and GLCanvas. These two components are lightweight and heavyweight swing components respectively.
The difficulty arises when adding the heavyweight GLCanvas component into the gui. Often I need to do a setVisible(false) on the component in which case the GLCanvas hides correctly, but shows a flicker before the background is displayed. On digging a little deeper I found that because the GLCanvas is heavyweight, on linux it calls down to the sun.awt.X11 classes to do the setVisible(false) on hide. The very deepest call, the xSetVisible(false) method of the XBaseWindow class, causes the component to be replaced by first a grey backgound, and then the correct background. This intermediate grey background is causing the flicker.
The source for the sun.awt.X11 packages was not available with the standard JDK 6 but I've found the open jdk source which matches the steps taken by the call. The xSetVisible method is as follows:
0667: public void xSetVisible(boolean visible) {
0668: if (log.isLoggable(Level.FINE))
0669: log.fine("Setting visible on " + this + " to " + visible);
0670: XToolkit.awtLock();
0671: try {
0672: this .visible = visible;
0673: if (visible) {
0674: XlibWrapper.XMapWindow(XToolkit.getDisplay(),
0675: getWindow());
0676: } else {
0677: XlibWrapper.XUnmapWindow(XToolkit.getDisplay(),
0678: getWindow());
0679: }
0680: XlibWrapper.XFlush(XToolkit.getDisplay());
0681: } finally {
0682: XToolkit.awtUnlock();
0683: }
0684: }I've found that the XlibWrapper.XFlush(XToolkit.getDisplay()) line (680) causes the grey to appear and then the XToolkit.awtUnlock(); line repaints the correct background.
Using the lightwieght GLJPanel resolves this issue as it is a light weight component but unfortunately I'm unable to use it as the target system does not have the GLX 1.3 libraries required because of intel chipset driver issues (it has GLX 1.2). I cannot enable the opengl pipline either (-Dsun.java2d.opengl=True) for the same reason.
Is there a way to configure a heavyweight component to avoid the operation in line 680? As far as I can tell, the flicker would disappear and the display would still be correctly rendered had this line not been executed. This problem is not present in windows.
I've put together a minimal example of the problem. It requires the JOGL 1.1.1 libraries in the classpath. They can be found here: [JOGL-download|https://jogl.dev.java.net/servlets/ProjectDocumentList?folderID=11509&expandFolder=11509&folderID=11508]
I've also found that running the program with the -Dsun.awt.noerasebackground=true vm argument reduces the flicker to just one incorrect frame.
The program creates a swing app with a button to switch between the GLCanvas and a normal JPanel. When switching from the GLCanvas to the JPanel a grey flicker is noticeable on Linux. Step through the code in debug mode to the classes mentioned above to see the grey flicker frame manifest.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.media.opengl.GLCanvas;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;
import javax.swing.border.EmptyBorder;
public class SwitchUsingJInternalFrameSwappedExample {
 private static JPanel glPanel;
 private static JPanel mainPanel;
 private static JPanel swingPanel1;
 private static boolean state;
 private static JInternalFrame layerFrame;
 private static GLCanvas glCanvas;
 public static void main(String[] args) {
 state = true;
 JFrame frame = new JFrame();
 frame.setSize(800, 800);
 frame.setContentPane(getMainPanel());
 frame.setVisible(true);
 frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
 frame.setBackground(Color.GREEN);
 // The main component.
 public static JPanel getMainPanel() {
 mainPanel = new JPanel();
 mainPanel.setBackground(new Color(0, 0, 255));
 mainPanel.setBorder(new EmptyBorder(new Insets(20, 20, 20, 20)));
 mainPanel.setLayout(new BorderLayout());
 mainPanel.add(getButton(), BorderLayout.NORTH);
 mainPanel.add(getAnimationPanel(), BorderLayout.CENTER);
 return mainPanel;
 // Switch button.
 private static JButton getButton() {
 JButton button = new JButton("Switch");
 button.addActionListener(new ActionListener() {
 @Override
 public void actionPerformed(ActionEvent e) {
 switchToOpenGl();
 return button;
 // Do the switch.
 protected static void switchToOpenGl() {
 // Make the OpenGL overlay visible / invisible.
 if (!state) {
 glCanvas.setVisible(false);
 } else {
 glCanvas.setVisible(true);
 state = !state;
 // Normal swing panel with buttons
 public static JPanel getNormalPanel() {
 if (swingPanel1 == null) {
 swingPanel1 = new JPanel();
 for (int i = 0; i < 10; i++) {
 swingPanel1.add(new JButton("Asdf" + i));
 swingPanel1.setBackground(Color.black);
 return swingPanel1;
 // Extra panel container just for testing whether background colors show through.
 public static JPanel getAnimationPanel() {
 if (glPanel == null) {
 glPanel = new JPanel(new BorderLayout());
 glPanel.setBorder(new EmptyBorder(new Insets(20, 20, 20, 20)));
 glPanel.setBackground(Color.YELLOW);
 glPanel.add(getLayerFrame(), BorderLayout.CENTER);
 return glPanel;
 // A component that has two layers (panes), one containing the swing components and one containing the OpenGl animation.
 private static JInternalFrame getLayerFrame() {
 if (layerFrame == null) {
 // Create a JInternalFrame that is not movable, iconifyable etc.
 layerFrame = new JInternalFrame(null, false, false, false, false);
 layerFrame.setBackground(new Color(155, 0, 0));
 layerFrame.setVisible(true);
 // Remove the title bar and border of the JInternalFrame.
 ((javax.swing.plaf.basic.BasicInternalFrameUI) layerFrame.getUI())
 .setNorthPane(null);
 layerFrame.setBorder(null);
 // Add a normal swing component
 layerFrame.setContentPane(getNormalPanel());
 // Add the OpenGL animation overlay on a layer over the content layer.
 layerFrame.setGlassPane(getGLCanvas());
 return layerFrame;
 // OpenGL component.
 public static GLCanvas getGLCanvas() {
 if (glCanvas == null) {
 glCanvas = new GLCanvas();
 glCanvas.setBackground(Color.CYAN);
 return glCanvas;
}

Oracle employees typically don't read these forums, you can report bugs here: http://bugs.sun.com/bugdatabase/

Help-using document as a java swing component

Hi,
can i use a document excel file or a doc file as a swing component.
i have few templates in in excel and .doc format.
i use them to produce bills by just entering data.
Now i want to develop a swing application and use the same templates in jpanel or jtextpane or jeditorpane.
its very hectic to make templates in swing using tables and all.
is there any api which can help me out???
thanks

as a Swing component? No.
There's probably libraries for reading those types of files, and maybe displaying them. POI, perhaps?

Swing component's margin in a frame

Hello all,
When you set the bounds of a Swing component in a frame, it will automatically apply those bounds to the VISIBLE part of the frame, so that, a Y value of 0, for example, will not be at the very top of the frame, but right underneath the title bar of the frame. If you give a regular AWT a value of 0 to it's Y coordinate, part (or all) of it will be covered by the title bar of the frame. This does not happen with Swing components, which automatically add the height of the title bar to the value you give to their Y coordinate.
Now, what I want to know is, how can I retrieve the value of that "automatic margin"?. How can I know the number of pixels that the Swing component is being slided down, in order to save the title bar of the frame? This value can not be constant, since it will differ from one platform to another, and from one Look 'n Feel to another, but I have not been able to find out the way to get the value that it's being applied in each case.
As allways, many thanks in advance for your help.

Don't know if there is any direct way to get this information. But, assuming the border width/height is equal on all four sides you could try something like:
Dimension frameD = frame.getSize();
Dimension contentD = frame.getContentPane().getSize();
int borderWidth = frameD.width - contentD.width;
int titleHeight = frameD.height - contentD.height - borderWidth;

How to set a Swing component as Modal window on a SWT Component.?

How to set a Swing component as Modal on a SWT Component.I mean, I have a window (SWT Container) with some menu items.
When I click on one menu item then i will get one new Swing Window.
When creating the new frame I had passed Modal value as TRUE in the constructer.Now child is not behaving as Modal Window.I mean I am able to go to parent window even though the child window is opened as a Modal Window.This is only happened when I double click on the Title Bar of the Parent Window.
If I try to click on any other part of the Parent Window except Title bar ... the child window is working as a Modal Window.
Can any one suggest me to solve this one !!

int this case, do this :
JFrame f = new JFrame("Authentification");
f.getContentPane().setLayout(new BorderLayout());
f.getContentPane().add(myJPanel, BorderLayout.CENTER);
f.setBounds(x,y,w,h);
f.setVisible(true);
Where myJPanel is the Panel you developped.

How to set a Swing component as Modal on a SWT Component?

How to set a Swing component as Modal on a SWT Componen?.I mean, I have a SWt Component window and from that window I am displaying a SWING Component Modal window.
The problem is my swing window is not working as Modal always.
When I opened the swing window from SWT window,swing window is working as Modal.But if Idouble click on Menubar or Title bar of the SWT Window then my Swing window goes back.If I click on any other part of the SWT window.. then once again Swing window is working as modal.
Can any one suggest me to solve this?
I think this is isuue related with Swing over SWT..

pradeep.rajadurai wrote:
I want set the JTable as a background of jframe or jinternalframe , how it is possible One way that may work, you can always extract the image from a rendered JTable and then paint the same image into the JPanel that holds your components via it's paintComponent method, then added the JPanel to the app's contentPane.
give me simple pgmIs English your second language? Because if so, please understand that this demand can be taken by some as rude.

Support for Multilingual Numeral Input in JTextField swing component

When the User Locale is changed from the regional & language options in the control panel and the standard digits are customized to a non Latin character set, all the windows applications adhere to the changes made. HTML also respects the changes in effect and displays any numeric values using the new character set, which are the national digits for many Eastern Locales such as Chinese, Arabic(Saudi Arabia), Urdu and many more. The JTextField swing component given by java, however, does not show any support to the new settings. Any numeric input is displayed in the Latin character set even when the input locale of the system is also changed respectively. Any text input for this case is correctly displayed in the desired literals and appropriate glyphs. However, unlike the AWT components, numeral input and display is not catered as per the user/developer's requirements. This behavior was first noticed in 2007, as far as i have found out, and was reported once again on the same thread in 2010. The thread is given below as a reference. No action or response has been taken. Kindly look into this matter and please let me know if this bug has been reported before and if there is any intent of providing a fix for it.
Reference: http://www.coderanch.com/t/344075/GUI/java/Multilingual-support-JTextField
Regards,
Aitzaz Ahmad
Software Engineer
SENSYS

I too had an itch to reply with something like this
This is a sign of work well done!
The WD has so strong UI abstraction, that hides client-server nature applications almost completely. If you search forum, you will even find posts where developers try to upgrade value of ProgressMeter in for loop )
VS

Accessing a servlet from another class

Not to confuse anyone too much, but here's the scenario.
I have a servlet that calles other Java classes which perform various functions. Now can I have one of these classes access the servlet directly, without setting up a socket based connection. What I mean is can I just simply call its methods and have access to the HttpServletResponse/HttpServletRequest objects?
Usually the servlet gets accessed via an HTTP client where then servlet will call classes it needs to access, where here I have a class accessing the servlet directly.
I do not have the capability of running servlets at the moment so I cannot just do a quick and dirty test to see how it would be done.
Any input would be appreciated.

If you have a servlet that contains methods that
aren't related to the processing of a request (except
for initialization) then those methods are in the
wrong place. I don't know where they should be
instead, that depends on your design. Perhaps you
should post some details about what you are trying to
do here.Currently I have not written code for what I am attempting.
What I am attempting is quite an unorthodox approach of getting server information via a servlet. However unlike your standard servlet the servlet will be accessed via a java class, rather than being invoked from a URL.
If I had to use psuedo-code I would put it like this:
class A{
public void accessHeaders(){
// access servlet HttpRequest object.
// use the object.
// display header info...etc.
// main prog.
class Test {
public static void main(String[] a){
A a = new A();
a.accessHeaders();
The servlet will be a generic servlet which overrides a doGet().
That's right an app accessing a servlet. I have done this but using the java.net package but I don't want to use that in this case. Can I implicitely call the servlet?
Now the more I think about doing something like this the more I feel that it cannot be done this way.
I am new to servlets so I don't know all the ways they can be used.

Swing component for awt.canvas

Hi,
Can anyone tell me the equivalent SWING component for awt CANVAS. I need it because i need to display only Images (nothing else) on it. If anyone can tell how I can do it.

JPanel is the Swing-equivalent of java.awt.Canvas, but if you are just displaying images, you can use the JLabel class, which supports use of images as icons (see also ImageIcon class).
Mitch Goldstein
Author, Hardcore JFC (Cambridge Univ Press)
[email protected]

Swing component fires an event to non-GUI code

Hi all -- this is my first post in forums.sun.com.
Question to get me started -
I have a Swing component that fires an ActionEvent. I would like that ActionEvent to trigger code that does not run on the AWT Event Queue thread (some code that will take some time without impacting GUI rendering performance.)
I know I could put that Event's action command into a synchronized Queue, and have a worker thread checking the queue and taking action when it finds a command there. Likewise, I could flag a volatile boolean as true, and have a worker thread check the flag and take action when true.
Or (and I suspect this is best), I could create a new SwingWorker thread right in actionPerformed().
Any opinions on what makes sense?

pkwooster: Yep. That's what I meant.
As for the design pattern, Observer was the pattern I was intending to use (and have already implemented). Would anyone argue that another method is more efficient or "correct"?
My sample project is:
Business Object -> Main Dialog -> Embedded Dialog
The Main Dialog contains no business logic - just simple navigation events. The Embedded Dialog contains the real controls and reports any interaction using Swing events, which the Main Dialog picks up.
I then set up the Observer pattern between the Main Dialog and the Business Object.

Make a PJC Swing component Modal?

Does anyone know how to keep a PJC that is a Swing component in the same focus as the form?
In other worsd, when you invoke a spell checker in MS Word the spell check window is in focus when the word window is in focus.
If a swing component is non modal then it can get lost in the shuffle. Is it possible to force a PJC to be Modal?
null

For instance, it looks as though the calendarWidget is non-modal

Searching a calendar swing component

Hello friends.
I'm looking for a calendar swing component, to make a schedule aplication (like Outlook).
I found "Mig Java Calendar" (http://www.migcalendar.com/index.php) but it isn't free, i need one like this free.
Do you know someone free?
Thank you.

And if you think, as I do, that a date picker is
standard component and should be part of the jdk,
please vote here:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=473
0041
-Pucethat is really helpful. I voted for it.

How to call Ocx in swing Component

Hi i want to play Flash4 file xxx.swf in swing Component
JMF Api Supports upto Flash2 only i downloadled Flash4 player which is a ocx file .how can i integrate this ocx in swing Component
help me please
regards
Mahesh.B

I have used the tool JacoZoom by InfoZoom (http://www.infozoom.de).
The tool can create JCWs (java callable wrappers) for COM and ActiveX objects.
If they are visual, you can create and display them within your Java app
either as AWT or in Swing.
In general, JacoZoom is the best tool I have found so far, it is my
favorite.
Sylvia

How to access j2ee servlet directly?

Hi All,
I have a question about Doc 333862.1
My customer wants to follow test case in the CAUSE section.
He wants to call SimpleServlet with bellow URL.
http://hostname:port/j2ee/servlet/SimpleServlet
When I execute it in our test instance, I can't access j2ee servlet directly and faced bellow HTTP 403 Forbidden warning.
"You don't have permission to access /j2ee on this server."
How to access the SimpleServlet?
If you have any solution or advice, please give me the feedback freely.
Regards,

how to create a new project of type J2EE -> EJB Module Project.
First of all u need to have NWDS.
There go to File -> New -> Project -> Select J2EE -> Select EJB Module Project
any prerequisites required to create this apart from the java gui
None. U may create the project here in NWDS and can deploy on XI server.
all in all i want to find how to access J2EE explorer.
J2EE Explorer can be seen under Windows -> Show View -> J2EE Explorer
Regards,
Prateek

My Swing component's style is changed!

Hi all. I am using Linux openSuse and from a week I see that my swing component's style is changed! JButton, JPanel, JMenu, JCheckBox and other have a different style and I don't know why... this is an example: http://img527.imageshack.us/img527/715/screen1lg1.png
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Anybody can help me? :'(

Swing Component to access a Servlet

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