File diplay concept in java swing

i want to display pdf page and xml page in java swing.
whether it is possible.
pls help

well i cant understand ur question first.
if u just wanna display them just as text files just create a text area and use the setText() method and write all the documents content into it(i assume u know how to read a file using streams)
i dont know whether it will work so simple for pdf files for their document structure might vary.
for pdf files try using iText API library...
if u wanna do processing those files use JAXP for xml and iText for pdf...i hope this necessaily answers ur questions.

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Creating file browser GUI using java swing tree

Hi all,
I have some questions which i wish to clarify asap. I am working on a file browser project using java swing. I need to create 2 separate buttons. 1 of them will add a 'folder' while the other button will add a 'file' to the tree when the buttons are clicked once. The sample source code known as 'DynamicTreeDemo' which is found in the java website only has 1 add button which is not what i want. Please help if you know how the program should be written. Thx a lot.
Regards,

Sorry, don't know 'DynamicTreeDemo'import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
import java.io.File;
public class Test extends JFrame {
JTree jt = new JTree();
DefaultTreeModel dtm = (DefaultTreeModel)jt.getModel();
JButton newDir = new JButton("new Dir"), newFile = new JButton("new File");
public Test() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Container content = getContentPane();
    newDir.setEnabled(false);
    newFile.setEnabled(false);
    jt.setShowsRootHandles(true);
    content.add(new JScrollPane(jt), BorderLayout.CENTER);
    File c = new File("C:\\temp");
    DefaultMutableTreeNode root = new DefaultMutableTreeNode(c);
    dtm.setRoot(root);
    addChildren(root);
    jt.addTreeSelectionListener(new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent tse) { select(tse) ; }
    JPanel jp = new JPanel();
    content.add(jp, BorderLayout.SOUTH);
    jp.add(newDir);
    jp.add(newFile);
    newDir.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        TreePath tp = jt.getSelectionPath();
        if (tp!=null) {
          DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode)tp.getLastPathComponent();
          File newFile = new File((File)dmtn.getUserObject(),"foo");
          if (newFile.mkdir()) {
            dmtn.add(new DefaultMutableTreeNode(newFile));
            dtm.nodeStructureChanged(dmtn);
          } else System.out.println("No Dir");
    newFile.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent ae) {
        TreePath tp = jt.getSelectionPath();
        if (tp!=null) {
          DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode)tp.getLastPathComponent();
          File newFile = new File((File)dmtn.getUserObject(),"foo.txt");
          try {
            if (newFile.createNewFile()) {
              dmtn.add(new DefaultMutableTreeNode(newFile));
              dtm.nodeStructureChanged(dmtn);
            } else System.out.println("No File");
          catch (java.io.IOException ioe) { ioe.printStackTrace(); }
    setSize(300, 300);
    setVisible(true);
void select(TreeSelectionEvent tse) {
    TreePath tp = jt.getSelectionPath();
    newDir.setEnabled(false);
    newFile.setEnabled(false);
    if (tp!=null) {
      DefaultMutableTreeNode dmtn = (DefaultMutableTreeNode)tp.getLastPathComponent();
      File f = (File)dmtn.getUserObject();
      if (f.isDirectory()) {
        newDir.setEnabled(true);
        newFile.setEnabled(true);
void addChildren(DefaultMutableTreeNode parent) {
    File parentFile = (File)parent.getUserObject();
    File[] children = parentFile.listFiles();
    for (int i=0; i<children.length; i++) {
      DefaultMutableTreeNode child = new DefaultMutableTreeNode(children);
parent.add(child);
if (children[i].isDirectory()) addChildren(child);
public static void main(String[] args) { new Test(); }

Loading large files in Java Swing GUI

Hello Everyone!
I am trying to load large files(more then 70 MB of xml text) in a Java Swing GUI. I tried several approaches,
1)Byte based loading whith a loop similar to
pane.setText("");
             InputStream file_reader = new BufferedInputStream(new FileInputStream
                       (file));
             int BUFFER_SIZE = 4096;
             byte[] buffer = new byte[BUFFER_SIZE];
             int bytesRead;
             String line;
             while ((bytesRead = file_reader.read(buffer, 0, BUFFER_SIZE)) != -1)
                  line = new String(buffer, 0, bytesRead);
                  pane.append(line);
             }But this is gives me unacceptable response times for large files and runs out of Java Heap memory.
2) I read in several places that I could load only small chunks of the file at a time and when the user scrolls upwards or downwards the next/previous chunk is loaded , to achieve this I am guessing extensive manipulation for the ScrollBar in the JScrollPane will be needed or adding an external JScrollBar perhaps? Can anyone provide sample code for that approach? (Putting in mind that I am writting code for an editor so I will be needing to interact via clicks and mouse wheel roatation and keyboard buttons and so on...)
If anyone can help me, post sample code or point me to useful links that deal with this issue or with writting code for editors in general I would be very grateful.
Thank you in advance.

Hi,
I'm replying to your question from another thread.
To handle large files I used the new IO libary. I'm trying to remember off the top of my head but the classes involved were the RandomAccessFile, FileChannel and MappedByteBuffer. The MappedByteBuffer was the best way for me to read and write to the file.
When opening the file I had to scan through the contents of the file using a swing worker thread and progress monitor. Whilst doing this I indexed the file into managable chunks. I also created a cache to further optimise file access.
In all it worked really well and I was suprised by the performance of the new IO libraries. I remember loading 1GB files and whilst having to wait a few seconds to perform the indexing you wouldn't know that the data for the JList was being retrieved from a file whilst the application was running.
Good Luck,
Martin.

Viewing and printing a PDF file from Java Swing Application

Hello,
I need to view and print PDF files from Java Swing Application.How do I do that?I appreciate your help.
Thank you
Sumana Somareddy

If you have a link to the URL pointing to the PDF file, you can allow the browser to open it. Then use the print function of the browser to print the PDF document.
Regards,
Tak.

How to store grid points in a file using Java Swing?

Please someone help me with any suggestions about how to store the grid points in a file using Java Swing

Actually i have designed a gridlayout in Java Swing and have added some components to it such as buttons or images....My problem is when I click on any of the cell of the grid,the corresponding cell number should be stored in an external file....Do u have any suggestions on how to do it?

How to store the datas in a .txt file in to a JTable in Java Swing

Hi sir,
Here i want to know how to store the data's of a .txt file
in to a JTable in java swing.
Where here the .txt file like for eg,spooler.txt is in the server and from there it will come to my client machine what i have to do is to take that .txt file and store the datas of the .txt file
in a JTable.This is what i want.So pls. do help and provide the code as well.I will be thankful.Since i am involved in a project which involves this it is Urgent.
Thanx,
m.ananthu

You can't just display data from a text file in a JTable. You have you understand the structure of the data so that you can parse the data and create a table model that can access the data in a row/column format. Here is an example of a simple program that does this:
http://forum.java.sun.com/thread.jsp?forum=57&thread=315172

How to convert oracle form fmb file to java swing file using Jdeveloper

how to convert oracle form fmb file to java swing file using Jdeveloper.Please explain with detailes steps if possible or please give a link where it is available
thanks
Message was edited by:
user591884

There is no automatic way to do this in JDeveloper. I know there are some Oracle Partners offering forms to java conversion, I don't know how much of their tools are automated and done with JDeveloper. With JDeveloper+ADF you basically rewriting the Forms application from scratch (and using ADF is helpful during this process).

Is File handling in Java Swing possible?

Hi I need to know whether file handling in Java Swing is possible or not?

cents wrote:
Thanks for ur answer.....Actually I just wanted to know whether "Reading from a file" and "Writing to a file" in Java Swing is possible or not?
Edited by: cents on Mar 16, 2010 9:35 AMWhat did google tell you? Did you see anything interesting in the API?

How to play flash files in java swings

Hi All ,
I have a requirement in java swings , i want to play advertisements ( flash files in swings )
can any one provide any example for the above requirement .
Thank you all for sharing knowledge in this great forum .
Jerry

I have a java desktop application which is actually a
kiosk application. I have to run some promotion
videos in my application when no user is using the
kiosk.Will the kiosks all be running the same OS?
The reason I ask is that JMF is available in both
standard and performance pack versions. The PP
provides a wider variety of formats, but runs only
on Win. and *nix.
videos can be any avi or neother which can easily be
played in java applications.That is handy. The JMF standard pack provides
support for a number of flavors of AVI, but not all.
What is the best way for me to play video files in a
java application??I would suggest checking if the 'standard' version
of the JMF can play* the current AVI's. If it can, use
the standard JMF for the project, if not, look to
converting the AVI's to something the JMF can
deal with, this might involve storing the video or
audio of the AVI's in a different format - you
might have to experiment to get the right
combination, but the JMF 'supported formats'
is a good guide.
http://java.sun.com/products/java-media/jmf/2.1.1/formats.html
* To check if JMF can play them, install it and
try loading the AVI's in JMStudio - the default
player.

Java Swing frame for modification Excel file or Word file with All menu...

Hello All,
Can Any one help me for making java Swing frame for modification Excel Data or word file with all Menu.. Plz send me java Code for that.. I am bit new in Swing.
i am waiting for ur help..
Thanks
Samir

hi pbrockway2 ,
Can you go through this program Sir, i am trying to call Excel content below of menu. when i will press Edit button then excel content should come below with Cut, copy, paste , Save Button..
Plz help me sir...
import javax.swing.*;
import java.io.*;
import java.awt.event.*;
public class TestReader
private static void createAndShowUI()
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame=new JFrame("Test Reader");
JButton button=new JButton("Edit");
button.addActionListener(new ButtonListener());
frame.getContentPane().add(button);
frame.setVisible(true);
frame.pack();
static class ButtonListener implements ActionListener
public void actionPerformed(ActionEvent event)
openTheFile();
private static void openTheFile()
try
String commands[]=new String[3];
commands[0]="cmd.exe";
commands[1]="/C";
commands[2]="INSTALL.LOG"; // here file name is supposed to be in the working dir
Runtime rt=Runtime.getRuntime();
Process proc=rt.exec(commands);
StreamGobbler errorGobbler=new StreamGobbler(proc.getErrorStream(),"ERROR");
StreamGobbler outputGobbler=new StreamGobbler(proc.getInputStream(),"OUTPUT");
errorGobbler.start();
outputGobbler.start();
catch (Exception e){}
public static void main(String args[])
SwingUtilities.invokeLater(new Runnable()
     public void run()
     createAndShowUI();
static class StreamGobbler extends Thread
InputStream is;
String type,root;
StreamGobbler(InputStream is,String type)
this.is=is;
this.type=type;
public void run()
try
InputStreamReader isr=new InputStreamReader(is);
     BufferedReader breader=new BufferedReader(isr);
     String line=null;
     while ((line=breader.readLine())!=null)
     System.out.println(type+">"+line);
catch (Exception e)
     System.out.println(e);
Thanks
SamiR

How to connect autocad file to java swing

hi,
plz immediately tell me how to connect autocad file to java swing .
plz help me
it is very urgent

Hi there
See if the link below helps you out.
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Cheers... Rick
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What is difference between C# Gzip and Java swing GZIPOutputStream?

Hi All,
I have a Java swing tool where i can compress file inputs and we have C# tool.
I am using GZIPOutputStream to compress the stream .
I found the difference between C# and Java Gzip compression while a compressing a file (temp.gif ) -
After Compression of temp.gif file in C# - compressed file size increased
while in java i found a 2% percentage of compression of data.
Could you please tell me , can i achieve same output in Java as compared to C# using GZIPOutputStream ?
Thank a lot in advance.

797957 wrote:
Does java provides a better compression than C#?no idea, i don't do c# programming. and, your question is most likely really: "does java default to a higher compression level than c#".
Btw what is faster compression vs. better compression?meaning, does the code spend more time/effort trying to compress the data (slower but better compression) or less time/effort trying to compress the data (faster but worse compression). most compression algorithms allow you to control this tradeoff depending on whether you care more about cpu time or disk/memory space.

Session in java swing??

Hi friends,
I need to create session in java swing...
I have a client running in swing and can access resources in multi-threaded server. I need to validate user using session. But i don't know how to use session.
User has to login with username & password (authentication verified at server using socket communication).
If successful the login frame vanishes and other options are displayed. user has a feature that he can send files to other
user. so i need to use session for security purpose.
Anyone help me with code
Edited by: sathya_vn on Apr 20, 2008 5:41 PM

Anyone help me with the code-----> u got tat wrong..
I need to know how to use session with java swing. I requested if anyone has such code....
This is a part of my project .
Am using MySQL Database to store username and password.
Cleint side interface has a frame (first frame--frame1) requesting client to provide login information. The login details <username and password> are sent to server. server validates whether the login info are correct or not and return true or false .
If false the frame1 will show a JOptionPane ... message stating that wrong username or password specified.
If true i need to create a session and other operations are done after session validation. I am using ssl socket.
If u want the code then i have post around 300 or more lines..

Invoking a Java swing application via its process id

I have a Java swing application. What i am trying to do here is that when the user double-clicks the jar file to open it, if the Swing application is already open and is minimized, I need to maximize the open window and make it active.
I tried using 'jps -l' command in my new instance, and with the help of Runtime.exec() am able to detect whether the application is already running or not, and if running, am able to get the process id and am displaying a message to user indicating the window is already open.
But how do i maximize the window of an already running application? Is it possible?

user13333704 wrote:
I have a Java swing application. What i am trying to do here is that when the user double-clicks the jar file to open it, if the Swing application is already open and is minimized, I need to maximize the open window and make it active. That's not hard to do, but your proposed solution is hard to do. The usual way to have only one instance of a Java application running is this:
Have the application open a SocketServer on a certain port number. Since only one process can listen on a port, the second instance of the application will fail when it tries to open the SocketServer. When that happens, the second instance should terminate instead of displaying its own GUI. Whether it terminates silently or whether it displays a dialog is up to you.
If you want the second instance to communicate with the first instance, that's easy because the first instance is listening on the port. So the second instance could connect to that port and send a message to it. In your case the first instance would respond to that message by maximizing its GUI.

Help with java swing

Hi people!i need some help
Im a new user for java programming language.Well im programming an application using java swing libraries. I have some problems trying to accesing variables from those swing Jpanels. Ill make it clear....
Im using Netbeans...
I have a class for the window (a JFrame) including 2 Jtextfields and 2 Jlabels
import .......
public class myclass extends javax.swing.JFrame{
public double gp;
public double gv;
public G() {
initComponents();
gpnom=this.gpnom;
gvnom=this.gvnom;
private void TXFgpnom(java.awt.event.ActionEvent evt) { //TXField
gpnom= Double.parseDouble(TXFgpnom.getText());
gvnom= Double.parseDouble(TXFgvnom.getText());
.......//theres a lot of more code .for listeners..next...
Now ive created a new file (a new class)in the same package ,but i cant access public variables from swing class
//the next class was created in a new file
public class hi () {
JPanel prin =(JPanel) new myclass().getContentPane(); //ok
double number=gpnom // error variable not found
When i try to get the value of "number" ...i always get "ERROR" And the class for that textfield was public..i think...
HOw can i use variables from that Jpanel?
Id appreciate an answer...
thanx for your help!
Paco

In future Swing related questions should be posted in the Swing forum and camickr will be more likely to answer if you have used code tags to properly format your code.
Luckily this problem does not seem to be Swing related in the least because the public variables you have in your other class are named gp and gv and further when you access public variables (or properties) of a class you must access them by an instance of that class. Which you don't appear to be doing either.

File diplay concept in java swing

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