如何在JTextArea中更改文本颜色？

JTextArea是为了娱乐.应用于单个字符的设置适用于 中的整个文档。但是，或者您可以选择，根据自己的喜好为您的颜色。在这里，在JTextPane的帮助下，你可以这样做：Plain TextJTextAreaJTextPaneJEditorPaneString Literals

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.border.*;

import javax.swing.text.AttributeSet;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;

public class TextPaneTest extends JFrame
{
    private JPanel topPanel;
    private JTextPane tPane;

    public TextPaneTest()
    {
        topPanel = new JPanel();        

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);            

        EmptyBorder eb = new EmptyBorder(new Insets(10, 10, 10, 10));

        tPane = new JTextPane();                
        tPane.setBorder(eb);
        //tPane.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY));
        tPane.setMargin(new Insets(5, 5, 5, 5));

        topPanel.add(tPane);

        appendToPane(tPane, "My Name is Too Good.\n", Color.RED);
        appendToPane(tPane, "I wish I could be ONE of THE BEST on ", Color.BLUE);
        appendToPane(tPane, "Stack", Color.DARK_GRAY);
        appendToPane(tPane, "Over", Color.MAGENTA);
        appendToPane(tPane, "flow", Color.ORANGE);

        getContentPane().add(topPanel);

        pack();
        setVisible(true);   
    }

    private void appendToPane(JTextPane tp, String msg, Color c)
    {
        StyleContext sc = StyleContext.getDefaultStyleContext();
        AttributeSet aset = sc.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.Foreground, c);

        aset = sc.addAttribute(aset, StyleConstants.FontFamily, "Lucida Console");
        aset = sc.addAttribute(aset, StyleConstants.Alignment, StyleConstants.ALIGN_JUSTIFIED);

        int len = tp.getDocument().getLength();
        tp.setCaretPosition(len);
        tp.setCharacterAttributes(aset, false);
        tp.replaceSelection(msg);
    }

    public static void main(String... args)
    {
        SwingUtilities.invokeLater(new Runnable()
            {
                public void run()
                {
                    new TextPaneTest();
                }
            });
    }
}

这是输出：

因为是可能的用法（或Html），这个API实现了风格化文本的减少选项HighlighterJTextArea

import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;

public class TextPaneHighlighting {

    private static final long serialVersionUID = 1L;
    private Highlighter.HighlightPainter cyanPainter;
    private Highlighter.HighlightPainter redPainter;

    public TextPaneHighlighting() {
        JFrame frame = new JFrame();
        JTextPane textPane = new JTextPane();
        textPane.setText("one\ntwo\nthree\nfour\nfive\nsix\nseven\neight\n");
        JScrollPane scrollPane = new JScrollPane(textPane);
        frame.add(scrollPane, BorderLayout.CENTER);//  Highlight some text
        cyanPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.cyan);
        redPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.red);
        try {
            textPane.getHighlighter().addHighlight(0, 3, DefaultHighlighter.DefaultPainter);
            textPane.getHighlighter().addHighlight(8, 14, cyanPainter);
            textPane.getHighlighter().addHighlight(19, 24, redPainter);
        } catch (BadLocationException ble) {
        }
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setPreferredSize(new Dimension(300, 200));
        frame.setLocationRelativeTo(null);
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                TextPaneHighlighting tph = new TextPaneHighlighting();
            }
        });
    }
}

与有选项相比，有更多可变的选项，例如荧光笔，带有Html或不带Html，Font，或者通过使用Html或直接将另一个JComponent放入其中（也知道JTextArea，但是...）JTextPane

import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;

public class Fonts implements Runnable {

    private String[] fnt;
    private JFrame frm;
    private JScrollPane jsp;
    private JTextPane jta;
    private int width = 450;
    private int height = 300;
    private GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    private StyledDocument doc;
    private MutableAttributeSet mas;
    private int cp = 0;
    private Highlighter.HighlightPainter cyanPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.cyan);
    private Highlighter.HighlightPainter redPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.red);
    private Highlighter.HighlightPainter whitePainter = new DefaultHighlighter.DefaultHighlightPainter(Color.white);
    private int _count = 0;
    private int _lenght = 0;

    public Fonts() {
        jta = new JTextPane();
        doc = jta.getStyledDocument();
        jsp = new JScrollPane(jta);
        jsp.setPreferredSize(new Dimension(height, width));
        frm = new JFrame("awesome");
        frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frm.setLayout(new BorderLayout());
        frm.add(jsp, BorderLayout.CENTER);
        frm.setLocation(100, 100);
        frm.pack();
        frm.setVisible(true);
        jta.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
        fnt = ge.getAvailableFontFamilyNames();
        mas = jta.getInputAttributes();
        new Thread(this).start();
    }

    @Override
    public void run() {
        for (int i = 0; i < fnt.length; i++) {
            StyleConstants.setBold(mas, false);
            StyleConstants.setItalic(mas, false);
            StyleConstants.setFontFamily(mas, fnt[i]);
            StyleConstants.setFontSize(mas, 16);
            dis(fnt[i]);
            try {
                Thread.sleep(75);
            } catch (Exception e) {
                e.printStackTrace();
            }
            StyleConstants.setBold(mas, true);
            dis(fnt[i] + " Bold");
            try {
                Thread.sleep(75);
            } catch (Exception e) {
                e.printStackTrace();
            }
            StyleConstants.setItalic(mas, true);
            dis(fnt[i] + " Bold & Italic");
            try {
                Thread.sleep(75);
            } catch (Exception e) {
                e.printStackTrace();
            }
            StyleConstants.setBold(mas, false);
            dis(fnt[i] + " Italic");
            try {
                Thread.sleep(75);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        jta.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
    }

    public void dis(String s) {
        _count++;
        _lenght = jta.getText().length();
        try {
            doc.insertString(cp, s, mas);
            doc.insertString(cp, "\n", mas);
        } catch (Exception bla_bla_bla_bla) {
            bla_bla_bla_bla.printStackTrace();
        }
        if (_count % 2 == 0) {
            try {
                jta.getHighlighter().addHighlight(1, _lenght - 1, cyanPainter);
            } catch (BadLocationException bla_bla_bla_bla) {
            }
        } else if (_count % 3 == 0) {
            try {
                jta.getHighlighter().addHighlight(1, _lenght - 1, redPainter);
            } catch (BadLocationException bla_bla_bla_bla) {
            }
        } else {
            try {
                jta.getHighlighter().addHighlight(1, _lenght - 1, whitePainter);
            } catch (BadLocationException bla_bla_bla_bla) {
            }
        }
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                Fonts fs = new Fonts();
            }
        });
    }
}