将JTextArea强制到JScrollPane的底部

Question

I've got the following code:

public class LobbyView extends JPanel
{
    this.setLayout(new MigLayout());
    private final JTextArea chatWindowMessage = new JTextArea();
    private final JScrollPane chatWindow = new JScrollPane(chatWindowMessage);

LobbyView(Window sentWindow)
{
    chatWindow.setViewportView(chatWindowMessage);
    chatWindow.setPreferredSize(new Dimension(300, 300));
    chatWindow.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);

    chatWindowMessage.setLineWrap(true);
    chatWindowMessage.append("test" + "\n");
    chatWindowMessage.append("test 2" + "\n");

    this.add(chatWindow, "pos 180px 75px");
    this.add(chatMessage, "pos 180px 380px");
}
}

The code results in the following JScrollPane:

How do I force the JTextArea to the bottom of the JScrollPane so it looks like this (NB I use MigLayout):

Answer 1

一种方法是根据JTextArea的行数在开头添加空白行，并使用setCaretPosition（）方法将插入号位置设置为TextArea的末尾。

Answer 2

To force JTextArea at the end of JScrollPane , you can make use of Layouts. BorderLayout will do the job for you.