如何更改 JTextArea 中的文本颜色?

问题描述

我需要知道如何做到这一点:

I need to know how to do this:

比方说:我在 JTextArea 中有一个这样的代码:

Let's say: I have a code in the JTextArea like this:

LOAD R1, 1
DEC R1
STORE M, R1
ADD R4, R1,8

我想将 LOAD、DEC、STORE 和 ADD 的颜色更改为蓝色R1, R4 为绿色M 到 RED数字到橙色

I wanted to change the color of LOAD, DEC, STORE and ADD to color BLUER1, R4 to color greenM to REDnumbers to ORANGE

如何更改此文本的颜色?这些文字来自记事本，也可以直接输入到文本区.

How to change the color of this text?These text were from notepad or can be directly type to the text area.

推荐答案

JTextArea 旨在娱乐 Plain Text.应用于单个字符的设置应用于 JTextArea 中的整个文档.但是使用 JTextPane 或 JEditorPane，您可以选择根据自己的喜好为 String Literals 着色.在 JTextPane 的帮助下，您可以这样做:

JTextArea is meant to entertain Plain Text. The settings applied to a single character applies to whole of the document in JTextArea. But with JTextPane or JEditorPane you have the choice, to colour your String Literals as per your liking. Here with the help of JTextPane, you can do it like this :

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.
", 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:

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