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ActionListener for specific text inside JTextArea?

My application has a chat component that has JTextArea. Now, how can I add an event like ActionListener for specific text (e.g. student: // xxxx)?

So, when I click on this text (student: // xxxx), something will happen. Thank.

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3 answers

Here, try this small program, try clicking at the beginning of student: //, as a result the Dialog message appears

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class TextAreaExample extends JFrame
{
    private JTextArea tarea =  new JTextArea(10, 10);
    private JTextField tfield = new JTextField(10);

    private void createAndDisplayGUI()
    {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        tarea.setText("Hello there\n");
        tarea.append("Hello student://");
        JScrollPane scroll = new JScrollPane(tarea);

        tfield.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent ae)
            {
                tarea.append(tfield.getText() + "\n");
            }
        });

        tarea.addMouseListener(new MouseAdapter()
        {
            public void mouseClicked(MouseEvent me)
            {
                int x = me.getX();
                int y = me.getY();
                System.out.println("X : " + x);
                System.out.println("Y : " + y);
                int startOffset = tarea.viewToModel(new Point(x, y));
                System.out.println("Start Offset : " + startOffset);
                String text = tarea.getText();
                int searchLocation = text.indexOf("student://", startOffset);
                System.out.println("Search Location : " + searchLocation);
                if (searchLocation == startOffset)
                    JOptionPane.showMessageDialog(TextAreaExample.this, "BINGO you found me.");
            }
        });

        getContentPane().add(scroll, BorderLayout.CENTER);
        getContentPane().add(tfield, BorderLayout.PAGE_END);
        pack();
        setLocationByPlatform(true);
        setVisible(true);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
        {
            public void run()
            {
                new TextAreaExample().createAndDisplayGUI();
            }
        });
    }
}
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, , ActionListeners JButtons - , AbstractButton, JTextComponents ( JTextFields). , MouseListener.

, , , JTextArea, , , BorderLayout.SOUTH, JTextField, . JTextField ActionListener ( ), "enter" .

1
:

, jtextfield, , , JTextArea. : , - ://id text.

, , , JTextArea, JList, SelectionListener. "line" ( JList ). , , , , JTextArea, JLists , .

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ENTER ?

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class StudentID extends JFrame implements ActionListener
{
    private static final String progname = "StudentID 0.1";

    private JTextField student;
    private JTextArea feedback;
    private JButton exit;

    public StudentID ()
    {
        super (progname);
        JPanel mainpanel = new JPanel ();
        mainpanel.setLayout (new BorderLayout ());
        this.getContentPane ().add (mainpanel);

        student = new JTextField ("student://");
        exit = new JButton ("exit");
        student.addActionListener (this);
        exit.addActionListener (this);
        feedback = new JTextArea ();
        mainpanel.add (student, BorderLayout.NORTH);
        mainpanel.add (feedback, BorderLayout.CENTER);
        mainpanel.add (exit, BorderLayout.SOUTH);

        setSize (400, 400);
        setLocation (100, 100);
        setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
        setVisible (true);
    }

    public void actionPerformed (final ActionEvent e)
    {
        SwingWorker worker = new SwingWorker () 
        {
            protected String doInBackground () throws InterruptedException 
            {
                String cmd = e.getActionCommand ();
                if (cmd.equals ("exit"))
                {
                    System.exit (0);
                }
                else if (cmd.matches ("student://[0-9]+")) 
                {
                    feedback.setText ("student found: " + cmd.replaceAll ("student://([0-9]+)", "$1"));
                }
                else
                {
                    feedback.setText ("cmd: " + cmd);
                }
                return "done";
            }
            protected void done () 
            {
                feedback.setText (feedback.getText () + "\ndone");
            }
        };
        worker.execute ();
    }

    public static void main (final String args[])
    {
        Runnable runner = new Runnable () 
        {
            public void run () 
            {
                new StudentID ();
            }
        };
        EventQueue.invokeLater (runner);
    }
}
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