该代码可能会给您一些想法：
import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.text.*;public class TextPanePerfectSize extends Jframe{ JTextField textField; JTextPane textPane; public TextPanePerfectSize() { textField = new JTextField(20); textField.setText("add text"); getContentPane().add(textField, BorderLayout.NORTH ); textField.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { try { document doc = textPane.getdocument(); doc.insertString(doc.getLength(), " " + textField.getText(), null); textField.setText(""); Dimension d = textPane.getPreferredSize(); Rectangle r = textPane.modelToView( textPane.getdocument().getLength() ); d.height = r.y + r.height; textPane.setPreferredSize( d ); getContentPane().validate();// pack(); } catch(Exception e2) {} } }); JLabel label = new JLabel("Hit Enter to Add Text to Text Pane"); getContentPane().add(label); JPanel south = new JPanel(); textPane = new JTextPane(); textPane.setText("Some text"); textPane.setEditable( false );// textPane.setPreferredSize( new Dimension(120, 23) ); south.add( textPane );// getContentPane().add(south, BorderLayout.SOUTH); getContentPane().add(textPane, BorderLayout.SOUTH); } public static void main(String[] args) { Jframe frame = new TextPanePerfectSize(); frame.setSize(200, 200); frame.setLocationRelativeTo( null ); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.setVisible(true); }}
