JTextField加DocumentListener监听

DocumentListener textChangeListener=new DocumentListener() {
	protected void changeFilter(DocumentEvent event) {
		javax.swing.text.Document document = event.getDocument();
		try {
			String text=document.getText(0, document.getLength());   
			System.out.println(text);

		} catch (Exception ex) {
			                ex.printStackTrace();
			                System.err.println(ex);
		}
	}

	public void changedUpdate(DocumentEvent e) {
		changeFilter(e);
	}

	public void insertUpdate(DocumentEvent e) {
		changeFilter(e);
	}

	public void removeUpdate(DocumentEvent e) {
		changeFilter(e);
	}
};
myJTextField.getDocument().addDocumentListener(textChangeListener);