在jTextField中设置hilighting颜色

我正在开发一个Java Swing应用程序。 此应用程序允许用户使用基本命令行。 例如，用户只需输入add "Something to be added."即可添加事件add "Something to be added." 。我想在用户输入此命令时突出显示add 。 任何人都可以实现jTextField。

Answer 1

一个想法是使用StyleDocument和DocumentFilter

这实际上是基于这个问题 ，但我不确定我是否可以尝试使用JTextField

 import java.awt.Color; import java.awt.EventQueue; import java.awt.GridBagLayout; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextField; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.text.AbstractDocument; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.DefaultHighlighter.DefaultHighlightPainter; import javax.swing.text.DefaultStyledDocument; import javax.swing.text.DocumentFilter; import javax.swing.text.DocumentFilter.FilterBypass; import javax.swing.text.JTextComponent; import javax.swing.text.SimpleAttributeSet; import javax.swing.text.StyleConstants; public class TextFieldHighlighter { public static void main(String[] args) { new TextFieldHighlighter(); } public TextFieldHighlighter() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JTextField field = new JTextField(new DefaultStyledDocument(), null, 20); ((AbstractDocument) field.getDocument()).setDocumentFilter(new HighlightDocumentFilter(field)); JFrame frame = new JFrame("Test"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new GridBagLayout()); frame.add(field); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class HighlightDocumentFilter extends DocumentFilter { private DefaultHighlightPainter highlightPainter = new DefaultHighlightPainter(Color.YELLOW); private JTextComponent field; private SimpleAttributeSet background; public HighlightDocumentFilter(JTextComponent field) { this.field = field; background = new SimpleAttributeSet(); StyleConstants.setBackground(background, Color.RED); } @Override public void insertString(FilterBypass fb, int offset, String text, AttributeSet attr) throws BadLocationException { super.insertString(fb, offset, text, attr); } @Override public void remove(FilterBypass fb, int offset, int length) throws BadLocationException { super.remove(fb, offset, length); } @Override public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException { String match = "and"; super.replace(fb, offset, length, text, attrs); int startIndex = offset - match.length(); if (startIndex >= 0) { String last = fb.getDocument().getText(startIndex, match.length()).trim(); if (last.equalsIgnoreCase(match)) { field.getHighlighter().addHighlight(startIndex, startIndex + match.length(), highlightPainter); } } } } }