swing 中的jTextArea 能不能加监听事件？

Question

jTextField.addActionListener(new action());可以这样加监听事件
请问各位大侠
swing 中的jTextArea 能不能加监听事件？ 要怎么写？

Answer 1

jTextField.addActionListener(new action());
class action implements ActionListener{

public void actionPerformed(ActionEvent arg0) {
     内容...
}
}jTextArea 我加了
jTextArea1.getDocument().addDocumentListener(new Area_OnValueChanged());
jTextArea1.addKeyListener(new areakey());
但是还确实一个类似上面jTextField.addActionListener(new action());监听
应该怎么写，最好是做过测试的代码。

Answer 2

监听我输入到jTextArea 的每个字

Answer 3

      javax.swing.JTextArea jTextArea = new javax.swing.JTextArea();
      jTextArea.addAncestorListener(new AncestorListener(){
         public void ancestorAdded(AncestorEvent evt) {
            //添加处理内容
         }         public void ancestorMoved(AncestorEvent arg0) {
         }         public void ancestorRemoved(AncestorEvent arg0) {
         }
      });

Answer 4

我按你的方法jTextArea1.addAncestorListener(new AncestorListener(){
         public void ancestorAdded(AncestorEvent evt) {
         System.out.println(jTextArea1.getText()); 
          }           public void ancestorMoved(AncestorEvent arg0) {
          }           public void ancestorRemoved(AncestorEvent arg0) {
          }
       });没监听到

Answer 5

只用这个 
jTextArea1.getDocument().addDocumentListener()
就足够了

Answer 6

your_jtextfield.addKeyListener(new KeyListener() {
    //method
});

Answer 7

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JLabel;import javax.swing.text.Document;
import javax.swing.text.BadLocationException;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;public class Example {
    public static void main(final String[] args) {
        EventQueue.invokeLater(new Runnable(){
                public void run(){
                    final JFrame frame = new JFrame("Example");
                    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    frame.setPreferredSize(new Dimension(800,600));
                    frame.setLocationRelativeTo(null);                    final JTextArea textinput = new JTextArea();
                    textinput.setLineWrap(true);
                    final JScrollPane scroller = new JScrollPane(textinput);
                    final JLabel status = new JLabel("Welcome!");                    textinput.getDocument().addDocumentListener(new DocumentListener(){
                            @Override public void insertUpdate(final DocumentEvent e) {
                                try{status.setText(e.getDocument().getText(e.getOffset(),e.getLength()));}
                                catch(BadLocationException xe){}
                            }
                            @Override public void removeUpdate(final DocumentEvent e) {
                                try{status.setText(e.getDocument().getText(e.getOffset(),e.getLength()));}
                                catch(BadLocationException xe){}
                            }
                            @Override public void changedUpdate(final DocumentEvent e) {
                                try{status.setText(e.getDocument().getText(e.getOffset(),e.getLength()));}
                                catch(BadLocationException xe){}
                            }
                        });
                    frame.getContentPane().add(scroller);
                    frame.getContentPane().add(status,BorderLayout.PAGE_END);                    frame.pack();
                    frame.setVisible(true);
                }
            });
    }
}

Answer 8

请教各位大侠，JTextArea都可以加哪些监听，分别是什么？TextArea监听都可以用吗？