We Keep Coding

How to read last word or latest word in JTextArea

I am making a Source code Editor using JtextArea.In that I want to do the following task." While user typing on Editor window(JtextArea),each and every time the updated text(last word) should compare with the set of words in the database, if it matches any one of the word then the definition will be open in new popup frame."
My coding is like following
String str = textarea.getText();
Class.forName(driver).newInstance();
conn = DriverManager.getConnection(url+dbName,userName,password);
String stm="select url from pingatabl where functn=?";
PreparedStatement st = conn.prepareStatement(stm);
st.setString(1, str);
//Excuting Query
ResultSet rs = st.executeQuery();
if (rs.next()) {
String s = rs.getString(1);
//Sets Records in frame
JFrame fm = new JFrame();
fm.setVisible(true);
fm.setSize(500,750);
JEditorPane jm = new JEditorPane();
fm.add(jm);
jm.setPage(ClassLoader.getSystemResource(s));
In the above coding String str = textarea.getText(); reads all the text in the textarea.. but i need to get last word only. How can i get latest word from JTextArea..

Use a DocumentListener to monitor for changes to the text component and use javax.swing.text.Utilities to calculate the start/end index of the word in the Document, from which you can the extract the result
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.Utilities;
public class TheLastWord {
public static void main(String[] args) {
new TheLastWord();
}
public TheLastWord() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
JTextArea ta = new JTextArea(10, 20);
add(new JScrollPane(ta));
JLabel lastWord = new JLabel("...");
add(lastWord, BorderLayout.SOUTH);
ta.getDocument().addDocumentListener(new DocumentListener() {
#Override
public void insertUpdate(DocumentEvent e) {
checkLastWord();
}
#Override
public void removeUpdate(DocumentEvent e) {
checkLastWord();
}
#Override
public void changedUpdate(DocumentEvent e) {
checkLastWord();
}
protected void checkLastWord() {
try {
int start = Utilities.getWordStart(ta, ta.getCaretPosition());
int end = Utilities.getWordEnd(ta, ta.getCaretPosition());
String text = ta.getDocument().getText(start, end - start);
lastWord.setText(text);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}
}

You can use following code block if you want to get the last word in the testarea
String[] wordsArray = textarea.getText().split("\\s+");
String lastWord = wordsArray[wordsArray.length - 1];
But if you want to get the last updated word then you have to use a Listener for that.
Check on DocumentListener and DocumentEvent
http://docs.oracle.com/javase/7/docs/api/javax/swing/event/DocumentListener.html
http://docs.oracle.com/javase/7/docs/api/javax/swing/event/DocumentEvent.html

To get the last line in your JEditorPane, split the text in the editor on \n as shown below:
String text = editor.getText();
String[] lines = text.split("\n");
String lastLine = lines[lines.length-1];
System.out.println("Last line: " + lastLine);
Similarly, to get the last word, split the last line on space.

Here a code of method that returns the last word of a text
public static String getLastWord(String s) {
int endOfLine = s.length() - 1;
boolean start = false;
while (!start && endOfLine >= 0) {
if (!Character.isLetter(s.charAt(endOfLine))) {
endOfLine--;
} else {
start = true;
}
}
final StringBuilder lastWord = new StringBuilder("");
while (start && endOfLine >= 0) {
if (!Character.isLetter(s.charAt(endOfLine))) {
start = false;
} else {
lastWord.insert(0, s.charAt(endOfLine));
endOfLine--;
}
}
return lastWord.toString();
}

How to generate html for text in JTextArea?

I have a problem in generating html code for a given string which is from
JTextArea textArea=new JTextArea(10,10);
String textToHtml=textArea.getText();
In this generated html code, it should contain with all html tags which are related to the given string.
Like <p>something like this</p>, <br> and etc.
Also this is not a web application. If you have any idea how do this. Suggest me. Thanks.
Update
For an example, if I type a text with line breaks, it should automatically insert <br> or <p>. This kind of function is available in Dreamweaver. It automatically inserts the code when you start filling the content in the webpage. The issue is so I don't want the non-technical usres to type the HTML code when they are writing paragraphs, because by default the tag and all are inserted. I will be emailing this directly to the user after this text is typed, so this formatting is essential.
It is important to note that I don't know what the user will type, it is all upto him. so whatever the method I use should be capable of identfying the places where it could put tags (like paragraph tag) and move on

For an example, if I type a text with line breaks, it should automatically insert <br> or <p>
The basic requirement would be to use a DocumentFilter to inject your markup when ever they type enter
import java.awt.BorderLayout;
import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
public class TestMarkup {
public static void main(String[] args) {
new TestMarkup();
}
public TestMarkup() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
JTextArea ta = new JTextArea(10, 20);
add(new JScrollPane(ta));
((AbstractDocument) ta.getDocument()).setDocumentFilter(new DocumentFilter() {
#Override
public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
if (text.endsWith("\n")) {
super.replace(fb, offset, 0, "<br>", attrs);
offset += 4;
}
super.replace(fb, offset, length, text, attrs);
}
});
}
}
}
Inserting <p>/</p> "might" be more difficult, but, if you assume that your first line starts with <p>, it's just a matter of inject </p> before the newline and <p> after it, then append the remaining text...
Updated with Paragraph support and pasting
Apparently I just can't walk away...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.util.StringJoiner;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
import javax.swing.text.DocumentFilter;
import javax.swing.text.Element;
public class TestMarkup {
public static void main(String[] args) {
new TestMarkup();
}
public TestMarkup() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static class TestPane extends JPanel {
public TestPane() {
setLayout(new BorderLayout());
JTextArea ta = new JTextArea(10, 20);
add(new JScrollPane(ta));
((AbstractDocument) ta.getDocument()).setDocumentFilter(new DocumentFilter() {
protected String getLastLineOfText(Document document) throws BadLocationException {
// Find the last line of text...
Element rootElem = document.getDefaultRootElement();
int numLines = rootElem.getElementCount();
Element lineElem = rootElem.getElement(numLines - 1);
int lineStart = lineElem.getStartOffset();
int lineEnd = lineElem.getEndOffset();
String lineText = document.getText(lineStart, lineEnd - lineStart);
return lineText;
}
#Override
public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException {
if (text.length() > 1) {
String lastLineOfText = getLastLineOfText(fb.getDocument());
if (!lastLineOfText.startsWith("<p>")) {
if (!text.startsWith("<p>")) {
text = "<p>" + text;
}
}
// Replace any line breaks with a new line
String[] lines = text.split("\n");
if (lines.length > 0) {
StringJoiner sj = new StringJoiner("<br>\n");
for (String line : lines) {
sj.add(line);
}
text = sj.toString();
}
if (!text.endsWith("</p>")) {
text += "</p>";
}
super.replace(fb, offset, length, text, attrs);
} else {
String postInsert = null;
if (text.endsWith("\n")) {
// Find the last line of text...
String lastLineOfText = getLastLineOfText(fb.getDocument());
lastLineOfText = lastLineOfText.substring(0, lastLineOfText.length() - 1);
postInsert = "<p>";
if (!lastLineOfText.endsWith("</p>")) {
super.replace(fb, offset, 0, "</p>", attrs);
offset += 4;
}
}
super.replace(fb, offset, length, text, attrs);
if (postInsert != null) {
offset += text.length();
super.replace(fb, offset, 0, "<p>", attrs);
}
}
}
});
}
}
}

Maybe you need something like this:
String textToHtml="something like this";
textToHtml = "<p>".concat(textToHtml).concat("</p>").concat("<br>");

How do I update a line already existing in JTextPane?

I would like to add a few lines to JTextPane, such as Joseph Red, Clarita Red, Bob Red, then later I would like to update both the name and color of a particular line, such as, I would like to change Joseph Red to Rudo Blue, or Bob Red to Molly Blue. Is there a way to do so? I wanted to record each line whenever adding a line to JTextPane and reference that particular line to update later on, but could not think of a way.
String color = "Red";
JTextPane textPanel = new JTextPane();
public void addToTextPane(String name) throws BadLocationException //Add each line to JTextPane
{
document = (StyledDocument) textPanel.getDocument();
document.insertString(document.getLength(), name + "" + color, null);
document.insertString(document.getLength(), "\n", null);
}
I am attempting to do something like the following (Update name and color of that a particular line that's already in the JTextPane):
if(...){
status = "Blue";
try
{
addTextPane("Jospeh"); //If I do this, it would not update the already exiting line and
//simply just add a new line with the name 'Joseph' and color 'Blue'
}
catch (BadLocationException e)
{
e.printStackTrace();
}
}

A for-loop in combination with Document#getText, Document#remove Document#insertString should do the trick...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.text.BadLocationException;
import javax.swing.text.Document;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextPane textPane;
private String fruit[] = {"Bananas", "Apples", "Oranges", "Kiwis"};
private int index;
public TestPane() {
StringBuilder text = new StringBuilder(64);
text.append("Bananas in pajamas are coming down the stairs\n").
append("Bananas in pajamas are coming down in pairs\n").
append("Bananas in pajamas are chasing teddy bears\n").
append("Cause on tuesdays they try to catch their man-o-wears");
textPane = new JTextPane();
textPane.setText(text.toString());
setLayout(new BorderLayout());
add(new JScrollPane(textPane));
JButton btn = new JButton("Update");
btn.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
index++;
String find = fruit[(index - 1) % fruit.length];
String replace = fruit[index % fruit.length];
System.out.println("Find: " + find);
System.out.println("Replace: " + replace);
Document doc = textPane.getDocument();
try {
for (int pos = 0; pos < doc.getLength() - find.length(); pos++) {
String text = doc.getText(pos, find.length());
if (find.equals(text)) {
doc.remove(pos, find.length());
doc.insertString(pos, replace, null);
}
}
} catch (BadLocationException exp) {
exp.printStackTrace();
}
}
});
add(btn, BorderLayout.SOUTH);
}
}
}

Adding copy action in windows to java app

I want to get the event like crtl+c or right click copy in windows , that could do the event to java application running ,
that means if someone copies some text , that should be pasted into the java application textarea...
i have made the java application and it can accept arguments through main method.
but how to trigger event from windows to java..

The simplest way is to monitor changes to the Toolkit.getSystemClipboard
There are two ways to do this. You can monitor changes to the DataFlavour, but this will only help if the data flavor changes, not the content and/or you could monitor the contents of the clipboard and update your view when it's content changes...
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.FlavorEvent;
import java.awt.datatransfer.FlavorListener;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class ClipboardMonitor {
public static void main(String[] args) {
new ClipboardMonitor();
}
public ClipboardMonitor() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JTextArea textArea;
public TestPane() {
textArea = new JTextArea(10, 10);
setLayout(new BorderLayout());
add(new JScrollPane(textArea));
Toolkit.getDefaultToolkit().getSystemClipboard().addFlavorListener(new FlavorListener() {
#Override
public void flavorsChanged(FlavorEvent e) {
setText(getClipboardContents());
}
});
Thread t = new Thread(new ContentsMonitor());
t.setDaemon(true);
t.start();
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
protected String getClipboardContents() {
String text = null;
Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
if (clipboard.isDataFlavorAvailable(DataFlavor.stringFlavor)) {
try {
Transferable contents = clipboard.getContents(TestPane.this);
text = (String) contents.getTransferData(DataFlavor.stringFlavor);
} catch (UnsupportedFlavorException | IOException ex) {
ex.printStackTrace();
}
}
return text;
}
protected void setText(final String text) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
textArea.setText(text);
}
});
}
public class ContentsMonitor implements Runnable {
#Override
public void run() {
String previous = getClipboardContents();
while (true) {
try {
Thread.sleep(1000);
} catch (InterruptedException ex) {
}
String text = getClipboardContents();
if (text != null && !text.equals(previous)) {
setText(text);
previous = text;
}
}
}
}
}
}

Java string replaceAll()

I've been wondering if for example:
JTextPane chatTextArea = new JTextPane();
s.replaceAll(":\\)", emoticon());
public String emoticon(){
chatTextArea.insertIcon(new ImageIcon(ChatFrame.class.getResource("/smile.png")));
return "`";
}
can put a picture and a "`" everywhere ":)" is found. When I run it like this if s contains a ":)" then the whole s gets replaced just by the icon.
Is there a way to do it?

Here is a small example I made (+1 to #StanislavL for the original), simply uses DocumentListener and checks when a matching sequence for an emoticon is entered and replaces it with appropriate image:
NB: SPACE must be pressed or another character/emoticon typed to show image
import java.awt.Dimension;
import java.awt.Image;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextPane;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.AbstractDocument;
import javax.swing.text.BadLocationException;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyledDocument;
import javax.swing.text.Utilities;
public class JTextPaneWithEmoticon {
private JFrame frame;
private JTextPane textPane;
static ImageIcon smiley, sad;
static final String SMILEY_EMOTICON = ":)", SAD_EMOTICON = ":(";
String[] emoticons = {SMILEY_EMOTICON, SAD_EMOTICON};
private void initComponents() {
frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
textPane = new JTextPane();
//add docuemntlistener to check for emoticon insert i.e :)
((AbstractDocument) textPane.getDocument()).addDocumentListener(new DocumentListener() {
#Override
public void insertUpdate(final DocumentEvent de) {
//We should surround our code with SwingUtilities.invokeLater() because we cannot change document during mutation intercepted in the listener.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
try {
StyledDocument doc = (StyledDocument) de.getDocument();
int start = Utilities.getRowStart(textPane, Math.max(0, de.getOffset() - 1));
int end = Utilities.getWordStart(textPane, de.getOffset() + de.getLength());
String text = doc.getText(start, end - start);
for (String emoticon : emoticons) {//for each emoticon
int i = text.indexOf(emoticon);
while (i >= 0) {
final SimpleAttributeSet attrs = new SimpleAttributeSet(doc.getCharacterElement(start + i).getAttributes());
if (StyleConstants.getIcon(attrs) == null) {
switch (emoticon) {//check which emtoticon picture to apply
case SMILEY_EMOTICON:
StyleConstants.setIcon(attrs, smiley);
break;
case SAD_EMOTICON:
StyleConstants.setIcon(attrs, sad);
break;
}
doc.remove(start + i, emoticon.length());
doc.insertString(start + i, emoticon, attrs);
}
i = text.indexOf(emoticon, i + emoticon.length());
}
}
} catch (BadLocationException ex) {
ex.printStackTrace();
}
}
});
}
#Override
public void removeUpdate(DocumentEvent e) {
}
#Override
public void changedUpdate(DocumentEvent e) {
}
});
JScrollPane scrollPane = new JScrollPane(textPane);
scrollPane.setPreferredSize(new Dimension(300, 300));
frame.add(scrollPane);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
try {//attempt to get icon for emoticons
smiley = new ImageIcon(ImageIO.read(new URL("http://facelets.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/e/m/emoticons0001.png")).getScaledInstance(24, 24, Image.SCALE_SMOOTH));
sad = new ImageIcon(ImageIO.read(new URL("http://zambia.primaryblogger.co.uk/files/2012/04/sad.jpg")).getScaledInstance(24, 24, Image.SCALE_SMOOTH));
} catch (Exception ex) {
ex.printStackTrace();
}
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new JTextPaneWithEmoticon().initComponents();
}
});
}
}
References:
How to add smileys in java swing?