Java Swing JTextArea左右写

Java Swing JTextArea左右写

您不能使用Jtextarea。

一种解决方案是使用a

JTextPane

并为插入的每一行文本设置属性：

import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.text.*;public class TextPaneChat{    private static void createAndShowGUI()    {        JTextPane textPane = new JTextPane();        Styleddocument doc = textPane.getStyleddocument();        SimpleAttributeSet left = new SimpleAttributeSet();        StyleConstants.setAlignment(left, StyleConstants.ALIGN_LEFT);        StyleConstants.setForeground(left, Color.RED);        SimpleAttributeSet right = new SimpleAttributeSet();        StyleConstants.setAlignment(right, StyleConstants.ALIGN_RIGHT);        StyleConstants.setForeground(right, Color.BLUE);        try        { doc.insertString(doc.getLength(), "Are you busy tonight?", left ); doc.setParagraphAttributes(doc.getLength(), 1, left, false); doc.insertString(doc.getLength(), "nNo", right ); doc.setParagraphAttributes(doc.getLength(), 1, right, false); doc.insertString(doc.getLength(), "nFeel like going to a movie?", left ); doc.setParagraphAttributes(doc.getLength(), 1, left, false); doc.insertString(doc.getLength(), "nSure", right ); doc.setParagraphAttributes(doc.getLength(), 1, right, false);        }        catch(Exception e) { System.out.println(e); }        Jframe frame = new Jframe("Text Pane Chat");        frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);        frame.add( new JScrollPane( textPane ) );        frame.setLocationByPlatform( true );        frame.setSize(200, 200);        frame.setVisible( true );    }    public static void main(String[] args)    {        EventQueue.invokeLater( () -> createAndShowGUI() );    }}