Using JSplitPane for Comparing two Files/Contents

Question

Hi Java Gurus,
I want to develope a Comparison tool which compares 2 jar files and report the difference in a user friendly manner. Everything is fine and i selected the JSplitPane to display the difference report. I face some problems in doing it exactly simillar way of presenting like a Comparison tools which is there in VSS.
I created 2 panels and added in a splitpane.
one panel contains the content of first jar file and another panel contains the content of second jar file.
The content are added in a textarea and the textarea is added to a scrollpane, which is added to the panel.
If i fix some size to Textarea, when i expand the Splitpane, the size is not getting expanded accordingly.
if i remove the size for textarea, the content is not displayed.
Can anyon give some suggestion.
Have anybody developed a GUI using JSplitPane simmilar to any Difference Tool simillar to VSS.
expecting your replies.
Raffi

Answer 1

Hi,
Eventhough the left and right pane are not synchronized, It is showing the Differences.
I have changed the JTextArea to JTextPane to have control on each of the String i am inserting.
It is fine. but when i am doing the comparison for the second time, i am removing the content of the Document (of the JTextPane) and adding the new Content to the Document (of the JTextPane).
While i am printing the length and text after removing the Old Content (in console), i am getting 0, "". But in the GUI old content are not removed and new content keeps on appending, eventhough i do updateUI() and validate().
Is that a BUG of JTextPane?????????????
Can any One Figure it out.
My Code is Here:
import java.io.*;
import java.util.zip.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
* put your documentation comment here
public class CheckZipFile extends JFrame {
private JLabel firstZip = null;
private JLabel secondZip = null;
private JTextField firstZipName = null;
private JTextField secondZipName = null;
private JButton compare = null;
private JPanel mainPanel = null;
private JFileChooser fileChooser = null;
private JButton chooseButton1 = null;
private JButton chooseButton2 = null;
private StringBuffer buffer = null;
private StringBuffer buffer1 = null;
private StringBuffer buffer2 = null;
private ApolloFileFilter zipFilter;
private JTextPane first = null;
private JTextPane second = null;
private Document doc1 = null;
private Document doc = null;
* put your documentation comment here
public CheckZipFile () {
initialize();
buildGUI();
addWindowListener();
setLookAndFeel();
this.pack();
* put your documentation comment here
private void initialize () {
buffer = new StringBuffer();
buffer1 = new StringBuffer();
buffer2 = new StringBuffer();
zipFilter = new ApolloFileFilter(new String[] {
"zip", "jar"
}, "ZIP and JAR Files");
fileChooser = new JFileChooser(new File("c:\\"));
//fileChooser.setAcceptAllFileFilterUsed(false);
fileChooser.addChoosableFileFilter(zipFilter);
* put your documentation comment here
private void setLookAndFeel () {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
SwingUtilities.updateComponentTreeUI(this);
if (fileChooser != null) {
SwingUtilities.updateComponentTreeUI(fileChooser);
} catch (UnsupportedLookAndFeelException exc) {
System.out.println("Unsupported Look And Feel:" +
exc);
} catch (IllegalAccessException exc) {
System.out.println("IllegalAccessException Error:"
+ exc);
} catch (ClassNotFoundException exc) {
System.out.println("ClassNotFoundException Error:"
+ exc);
} catch (InstantiationException exc) {
System.out.println("InstantiateException Error:"
+ exc);
* put your documentation comment here
private void buildGUI () {
mainPanel = createPanel();
this.getContentPane().setLayout(new BorderLayout());
this.getContentPane().add(mainPanel, BorderLayout.CENTER);
this.getContentPane().add(createDifferencePanel(), BorderLayout.SOUTH);
this.setSize(700, 450);
SwingUtilities.updateComponentTreeUI(this);
* put your documentation comment here
* @return
private JPanel createPanel () {
JPanel main = new JPanel() {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(300, 90);
main.setLayout(new GridLayout(3, 3));
firstZip = new JLabel("First Jar/Zip File:") {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(100, 30);
main.add(firstZip);
firstZipName = new JTextField() {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(100, 30);
main.add(firstZipName);
chooseButton1 = new JButton("Choose File 1") {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(100, 30);
main.add(chooseButton1);
chooseButton1.addActionListener(new ButtonListener());
secondZip = new JLabel("Second Jar/Zip File:") {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(100, 30);
main.add(secondZip);
secondZipName = new JTextField() {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(100, 30);
main.add(secondZipName);
chooseButton2 = new JButton("Choose File 2") {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(100, 30);
main.add(chooseButton2);
chooseButton2.addActionListener(new ButtonListener());
JLabel temp1 = new JLabel("") {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(100, 30);
main.add(temp1);
compare = new JButton("Compare") {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(100, 30);
compare.addActionListener(new ButtonListener());
main.add(compare);
JLabel temp2 = new JLabel("") {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(100, 30);
main.add(temp2);
return main;
* put your documentation comment here
* @param fileContent1
* @param fileContent2
private void updateGUI (String fileContent1, String fileContent2) {
System.out.println("Came here UpdateGUI");
updateDifferencePanel(fileContent1, fileContent2);
System.out.println("Came here UpdateGUI after call");
SwingUtilities.updateComponentTreeUI(this);
* put your documentation comment here
* @return
private JSplitPane createDifferencePanel () {
JPanel firstPanel = new JPanel() {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(350, 360);
first = new JTextPane();
initStylesForTextPane(first);
doc1 = first.getDocument();
JScrollPane scroll1 = new JScrollPane(first);
scroll1.setPreferredSize(new Dimension(325, 360));
scroll1.setMinimumSize(new Dimension(100, 100));
firstPanel.add(scroll1);
first.updateUI();
first.validate();
JPanel secondPanel = new JPanel() {
* put your documentation comment here
* @return
public Dimension getPrefferedSize () {
return new Dimension(350, 360);
second = new JTextPane();
initStylesForTextPane(second);
doc = second.getDocument();
JScrollPane scroll2 = new JScrollPane(second);
scroll2.setPreferredSize(new Dimension(325, 360));
scroll2.setMinimumSize(new Dimension(100, 100));
secondPanel.add(scroll2);
second.updateUI();
second.validate();
JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,
firstPanel, secondPanel);
splitPane.setDividerLocation(0.5);
splitPane.updateUI();
splitPane.validate();
splitPane.setPreferredSize(new Dimension(700, 360));
return splitPane;
* put your documentation comment here
* @param fileContent1
* @param fileContent2
private void updateDifferencePanel (String fileContent1,
String fileContent2) {
System.out.println("Came here");
try {
doc1 = first.getDocument();
System.out.println("Text bef: " + first.getText());
System.out.println("Length bef: " + doc1.getLength());
doc1.remove(0, doc1.getLength());
System.out.println("Length aft: " + doc1.getLength());
System.out.println("Text aft: " + first.getText());
doc1.insertString(doc1.getLength(), "test", first.getStyle("regular"));
first.updateUI();
first.validate();
} catch (BadLocationException ble1) {
ble1.printStackTrace();
StringTokenizer tokens1 = new StringTokenizer(fileContent1,
String token1 = "";
String text1 = "";
String differs1 = "false";
int indexOfColon1 = -1;
int count1 = 0;
while (tokens1.hasMoreTokens()) {
token1 = (String)tokens1.nextToken();
count1++;
indexOfColon1 = token1.lastIndexOf(":");
text1 = token1.substring(0, indexOfColon1);
differs1 = token1.substring(indexOfColon1 + 1);
try {
if (count1 == 1)
System.out.println("Start: " + doc1.getLength());
if (differs1.equals("true"))
doc1.insertString(doc1.getLength(), text1
+ ":", first.getStyle("bold"));
else
doc1.insertString(doc1.getLength(), text1
+ ":", first.getStyle("regular"));
if ((count1%3) == 0)
doc1.insertString(doc1.getLength(), "\n",
first.getStyle("regular"));
} catch (BadLocationException ble1) {
ble1.printStackTrace();
first.updateUI();
first.validate();
try {
System.out.println("Length bef: " + doc.getLength());
doc.remove(0, doc.getLength());
System.out.println("Length aft: " + doc.getLength());
second.updateUI();
second.validate();
} catch (BadLocationException ble1) {
ble1.printStackTrace();
StringTokenizer tokens = new StringTokenizer(fileContent2,
String token = "";
String text = "";
String differs = "false";
int indexOfColon = -1;
int count = 0;
while (tokens.hasMoreTokens()) {
token = (String)tokens.nextToken();
count++;
indexOfColon = token.lastIndexOf(":");
text = token.substring(0, indexOfColon);
differs = token.substring(indexOfColon + 1);
try {
if (differs.equals("true"))
doc.insertString(doc.getLength(), text +
":", second.getStyle("bold"));
else
doc.insertString(doc.getLength(), text +
":", second.getStyle("regular"));
if ((count%3) == 0)
doc.insertString(doc.getLength(), "\n",
second.getStyle("regular"));
} catch (BadLocationException ble) {
ble.printStackTrace();
second.updateUI();
second.validate();
* put your documentation comment here
* @param textPane
protected void initStylesForTextPane (JTextPane textPane) {
//Initialize some styles.
Style def = StyleContext.getDefaultStyleContext().getStyle(StyleContext.DEFAULT_STYLE);
Style regular = textPane.addStyle("regular", def);
StyleConstants.setFontFamily(def, "SansSerif");
Style s = textPane.addStyle("italic", regular);
StyleConstants.setItalic(s, true);
s = textPane.addStyle("bold", regular);
StyleConstants.setBold(s, true);
s = textPane.addStyle("small", regular);
StyleConstants.setFontSize(s, 10);
s = textPane.addStyle("large", regular);
StyleConstants.setFontSize(s, 16);
s = textPane.addStyle("icon", regular);
StyleConstants.setAlignment(s, StyleConstants.ALIGN_CENTER);
StyleConstants.setIcon(s, new ImageIcon("images/Pig.gif"));
s = textPane.addStyle("button", regular);
StyleConstants.setAlignment(s, StyleConstants.ALIGN_CENTER);
JButton button = new JButton(new ImageIcon("images/sound.gif"));
button.setMargin(new Insets(0, 0, 0, 0));
button.addActionListener(new ActionListener() {
* put your documentation comment here
* @param e
public void actionPerformed (ActionEvent e) {
Toolkit.getDefaultToolkit().beep();
StyleConstants.setComponent(s, button);
* put your documentation comment here
private void addWindowListener () {
this.addWindowListener(new WindowAdapter() {
* put your documentation comment here
* @param we
public void windowClosed (WindowEvent we) {
CheckZipFile.this.dispose();
System.exit(1);
* put your documentation comment here
* @param we
public void windowClosing (WindowEvent we) {
CheckZipFile.this.dispose();
System.exit(1);
* put your documentation comment here
* @param argv[]
* @exception Exception
public static void main (String argv[]) throws Exception {
CheckZipFile compareZip = new CheckZipFile();
compareZip.pack();
compareZip.setVisible(true);
* put your documentation comment here
public class ButtonListener
implements ActionListener {
* put your documentation comment here
* @param ae
public void actionPerformed (ActionEvent ae) {
if (ae.getSource() == chooseButton1) {
int retval = fileChooser.showDialog(CheckZipFile.this,
"Select");
if (retval == JFileChooser.APPROVE_OPTION) {
File theFile = fileChooser.getSelectedFile();
if (theFile != null) {
File[] files = fileChooser.getSelectedFiles();
if (fileChooser.isMultiSelectionEnabled()
&& files != null && files.length > 1) {
String filenames = "";
for (int i = 0; i < files.length; i++) {
filenames = filenames + "\n"
+ files.getPath();
JOptionPane.showMessageDialog(CheckZipFile.this,
"You chose these files: \n"
+ filenames + "\n Multiple Selection Should not be done here");
else if (theFile.isDirectory()) {
JOptionPane.showMessageDialog(CheckZipFile.this,
"You chose this directory: "
+ fileChooser.getSelectedFile().getPath()
+ "\n Please select a Zip File or jar File");
else {
JOptionPane.showMessageDialog(CheckZipFile.this,
"You chose this file: " +
fileChooser.getSelectedFile().getPath());
firstZipName.setText(fileChooser.getSelectedFile().getPath());
return;
else if (retval == JFileChooser.CANCEL_OPTION) {
JOptionPane.showMessageDialog(CheckZipFile.this,
"User cancelled operation. No file was chosen.");
else if (retval == JFileChooser.ERROR_OPTION) {
JOptionPane.showMessageDialog(CheckZipFile.this,
"An error occured. No file was chosen.");
else {
JOptionPane.showMessageDialog(CheckZipFile.this,
"Unknown operation occured.");
if (ae.getSource() == chooseButton2) {
int retval = fileChooser.showDialog(CheckZipFile.this,
"Select");
if (retval == JFileChooser.APPROVE_OPTION) {
File theFile = fileChooser.getSelectedFile();
if (theFile != null) {
File[] files = fileChooser.getSelectedFiles();
if (fileChooser.isMultiSelectionEnabled()
&& files != null && files.length > 1) {
String filenames = "";
for (int i = 0; i < files.length; i++) {
filenames = filenames + "\n"
+ files[i].getPath();
JOptionPane.showMessageDialog(CheckZipFile.this,
"You chose these files: \n"
+ filenames + "\n Multiple Selection Should not be done here");
else if (theFile.isDirectory()) {
JOptionPane.showMessageDialog(CheckZipFile.this,
"You chose this directory: "
+ fileChooser.getSelectedFile().getPath()
+ "\n Please select a Zip File or jar File");
else {
JOptionPane.showMessageDialog(CheckZipFile.this,
"You chose this file: " +
fileChooser.getSelectedFile().getPath());
secondZipName.setText(fileChooser.getSelectedFile().getPath());
return;
else if (retval == JFileChooser.CANCEL_OPTION) {
JOptionPane.showMessageDialog(CheckZipFile.this,
"User cancelled operation. No file was chosen.");
else if (retval == JFileChooser.ERROR_OPTION) {
JOptionPane.showMessageDialog(CheckZipFile.this,
"An error occured. No file was chosen.");
else {
JOptionPane.showMessageDialog(CheckZipFile.this,
"Unknown operation occured.");
if (ae.getSource() == compare) {
String file1 = firstZipName.getText();
String file2 = secondZipName.getText();
if (file1 == null || file2 == null) {
JOptionPane.showMessageDialog(CheckZipFile.this,
"Enter / Select the Files to be compared");
return;
if (file1.equals("") || file2.equals("")) {
JOptionPane.showMessageDialog(CheckZipFile.this,
"Enter / Select the Files to be compared");
return;
try {
ZipFile zip1 = new ZipFile(file1);
ZipFile zip2 = new ZipFile(file2);
int size1 = zip1.size();
int size2 = zip2.size();
if (size1 != size2) {
JOptionPane.showMessageDialog(CheckZipFile.this,
"Size of both the jars are not same");
return;
Enumeration entries1 = zip1.entries();
Enumeration entries2 = zip2.entries();
ZipEntry entry1 = null;
ZipEntry entry2 = null;
String name1 = "";
String name2 = "";
long filesize1 = 0;
long filesize2 = 0;
long time1;
long time2;
//StringBuffer detail = new StringBuffer();
boolean nameDiffers = false;
boolean sizeDiffers = false;
boolean timeDiffers = false;
buffer.append(file1 + "\t\t\t" + file2 +
"\n______________________________________________________________________\n");
//buffer1.append("\t\t" + file1 + "\n");
//buffer2.append("\t\t" + file2 + "\n");
int length = buffer.length();
for (int x = 0; x < size1; x++) {
nameDiffers = false;
sizeDiffers = false;
timeDiffers = false;
entry1 = (ZipEntry)entries1.nextElement();
entry2 = (ZipEntry)entries2.nextElement();
name1 = entry1.getName();
name2 = entry2.getName();
filesize1 = entry1.getSize();
filesize2 = entry2.getSize();
time1 = entry1.getTime();
time2 = entry2.getTime();
if (!name1.equals(name2)) {
//System.out.println("Name of the Entries in both the Jars are not same:\n"+ entry1.getName() + " : " + entry2.getName() );
nameDiffers = true;
//return;
//else
//     System.out.println("Name: " +entry1.getName());
if (filesize1 != filesize2) {
//System.out.println("Size of the Entries in both the Jars are not same:\n"+ entry1.getSize() + " : " + entry2.getSize() );
sizeDiffers = true;
//return;
if (time1 != time2) {
//System.out.println("Time of the Entries in both the Jars are not same:\n"+ entry1.getTime() + " : " + entry2.getTime() );
timeDiffers = true;
//return;
if (nameDiffers || sizeDiffers || timeDiffers) {
if (filesize1 != 0 && filesize2 !=
0) {
buffer.append(name1 + ":" +
filesize1 + ":" + new java.util.Date(time1)
+ "\t" + name2 + ":"
+ filesize2 + ":" +
new java.util.Date(time2)
+ "\n");
buffer1.append(name1 + ":" +
nameDiffers + ";" +
filesize1 + ":" + sizeDiffers
+ ";" + new java.util.Date(time1).toString()
+ ":" + timeDiffers +
buffer2.append(name2 + ":" +
nameDiffers + ";" +
filesize2 + ":" + sizeDiffers
+ ";" + new java.util.Date(time2).toString()
+ ":" + timeDiffers +
if (length == buffer.length())
JOptionPane.showMessageDialog(CheckZipFile.this,
"Both the Zip / Jar Files are Identical");
else {
getToolkit().beep();
//System.out.println(buffer.toString());
updateGUI(buffer1.toString(), buffer2.toString());
getToolkit().beep();
} catch (Exception ex) {
ex.printStackTrace();