如何在Java Swing TextArea中更改突出显示颜色？ 并且，更改与突出显示位置对应的文本的开头
问题1：通过使用defaulthighlighter，我可以使聚焦线变为蓝色。 现在我想把它换成其他颜色。 有谁知道如何更改此参数？ – – 解决了
问题2：pos是我想要突出显示的子字符串的起始索引。 我用setCaretPosition（pos）; 更新显示内容。 但它总是出现在窗口的底部。 我想把它放在最顶层。 谁能告诉我如何处理？
我使用一个演示来显示我的问题：
import java.awt.Color; import java.net.MalformedURLException; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.SwingUtilities; import javax.swing.text.BadLocationException; import javax.swing.text.DefaultHighlighter; public class Test { public static void main(final String[] args) throws MalformedURLException { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { try { init(); } catch (BadLocationException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); } private static void init() throws BadLocationException { JFrame frame = new JFrame(); final JTextArea textArea = new JTextArea(); JScrollPane pane = new JScrollPane(textArea); textArea.setText("Something. Something else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Samething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Sbmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Scmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Sdmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Semething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Sfmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Sgmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n"); textArea.setSelectionColor(Color.RED); frame.add(pane); frame.setSize(300, 120); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); String turnToString2 = "Sdmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla"; int pos2 = textArea.getText().indexOf(turnToString2); textArea.getHighlighter().addHighlight(pos2, pos2 + turnToString2.length(), new DefaultHighlighter.DefaultHighlightPainter(Color.yellow)); textArea.setCaretPosition(pos2); 结果是： 
我希望它位于屏幕的右上角，但在此代码中，它显示在滚动窗格的底部。 任何人都可以知道如何改变这个？ 谢谢。
您可以实现这一点，但不能直接实现，因为您必须将引用保存到已添加到所述行的Highlight中，因此您必须遍历所有要点以删除所需的那个，看看程序附上，可能会帮助你达到你想要的目的：
最新编辑：新代码，删除了一些错误，并添加了与设置收纳位置相关的所需function
import java.awt.*; import java.awt.event.*; import java.util.Map; import java.util.HashMap; import javax.swing.*; import javax.swing.text.*; public class TextHighlight { private JTextArea tarea; private JComboBox cbox; private JTextField lineField; private String[] colourNames = {"RED", "ORANGE", "CYAN"}; private Highlighter.HighlightPainter redPainter; private Highlighter.HighlightPainter orangePainter; private Highlighter.HighlightPainter cyanPainter; private int firstUpdateIndex; private int counter; private Map highlights = new HashMap(); public TextHighlight() { redPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.RED); orangePainter = new DefaultHighlighter.DefaultHighlightPainter(Color.ORANGE); cyanPainter = new DefaultHighlighter.DefaultHighlightPainter(Color.CYAN); firstUpdateIndex = -1; counter = 0; } private void createAndDisplayGUI() { final JFrame frame = new JFrame("Text HIGHLIGHT"); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); JPanel contentPane = new JPanel(); contentPane.setBorder(BorderFactory.createTitledBorder( BorderFactory.createEmptyBorder(5, 5, 5, 5), "Highlighter JTextArea")); tarea = new JTextArea(10, 10); JScrollPane scrollPane = new JScrollPane(tarea); contentPane.add(scrollPane); JButton remHighButton = new JButton("REMOVE HIGHLIGHT"); remHighButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { String input = JOptionPane.showInputDialog(frame, "Please Enter Start Index : " , "Highlighting Options : " , JOptionPane.PLAIN_MESSAGE); if (input != null && (highlights.size() > 0)) { int startIndex = Integer.parseInt(input.trim()); Highlighter highlighter = tarea.getHighlighter(); highlighter.removeHighlight(highlights.get(startIndex)); tarea.setCaretPosition(startIndex); tarea.requestFocusInWindow(); highlights.remove(startIndex); } } }); JButton button = new JButton("HIGHLIGHT TEXT"); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent ae) { String text = null; text = tarea.getSelectedText(); if (text != null && text.length() > 0) { int startIndex = tarea.getText().indexOf(text); int endIndex = startIndex + text.length(); Highlighter highlighter = tarea.getHighlighter(); int selection = JOptionPane.showConfirmDialog( frame, getOptionPanel(), "Highlight Colour : " , JOptionPane.OK_CANCEL_OPTION , JOptionPane.PLAIN_MESSAGE); System.out.println("TEXT : " + text); System.out.println("START INDEX : " + startIndex); System.out.println("END INDEX : " + endIndex); if (selection == JOptionPane.OK_OPTION) { String colour = (String) cbox.getSelectedItem(); try { if (colour == colourNames[0]) { System.out.println("Colour Selected : " + colour); highlighter.addHighlight(startIndex, endIndex, redPainter); } else if (colour == colourNames[1]) { System.out.println("Colour Selected : " + colour); highlighter.addHighlight(startIndex, endIndex, orangePainter); } else if (colour == colourNames[2]) { System.out.println("Colour Selected : " + colour); highlighter.addHighlight(startIndex, endIndex, cyanPainter); } Highlighter.Highlight[] highlightIndex = highlighter.getHighlights(); System.out.println("Lengh of Highlights used : " + highlightIndex.length); highlights.put(startIndex, highlightIndex[highlightIndex.length - 1]); } catch(BadLocationException ble) { ble.printStackTrace(); } } else if (selection == JOptionPane.CANCEL_OPTION) { System.out.println("CANCEL BUTTON PRESSED."); } else if (selection == JOptionPane.CLOSED_OPTION) { System.out.println("JOPTIONPANE CLOSED DELIBERATELY."); } } } }); frame.add(remHighButton, BorderLayout.PAGE_START); frame.add(contentPane, BorderLayout.CENTER); frame.add(button, BorderLayout.PAGE_END); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } private JPanel getOptionPanel() { JPanel panel = new JPanel(); panel.setBorder(BorderFactory.createTitledBorder( BorderFactory.createLineBorder(Color.DARK_GRAY, 2), "COLOUR SELECTION")); panel.setLayout(new GridLayout(0, 2, 5, 5)); JLabel colourLabel = new JLabel("Select One Colour : "); cbox = new JComboBox(colourNames); panel.add(colourLabel); panel.add(cbox); return panel; } public static void main(String... args) { SwingUtilities.invokeLater(new Runnable() { public void run() { new TextHighlight().createAndDisplayGUI(); } }); } }
输出：
开始 ： 
亮点第一线 
第二 
删除突出显示 
突出显示不同颜色的相同线条 
最新编辑与问题中的SAMPLE CODE一致
import java.awt.*; import java.net.MalformedURLException; import javax.swing.*; import javax.swing.text.*; public class Test { public static void main(final String[] args) throws MalformedURLException { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { try { init(); } catch (BadLocationException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); } private static void init() throws BadLocationException { JFrame frame = new JFrame(); final JTextArea textArea = new JTextArea(); JScrollPane pane = new JScrollPane(textArea); textArea.setText("Something. Something else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Samething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Sbmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Scmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Sdmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Semething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Sfmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nSomething. Sgmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n"); textArea.setSelectionColor(Color.RED); frame.add(pane); frame.setSize(300, 120); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); String turnToString2 = "Sdmething else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla"; int pos2 = textArea.getText().indexOf(turnToString2); Rectangle startIndex = textArea.modelToView(pos2); textArea.getHighlighter().addHighlight(pos2, pos2 + turnToString2.length(), new DefaultHighlighter.DefaultHighlightPainter(Color.yellow)); int y = startIndex.y + (pane.getHeight() - 10); System.out.println("Pane Height : " + pane.getHeight()); System.out.println("X : " + startIndex.x); System.out.println("Y : " + y); System.out.println("Y (pos2) : " + startIndex.y); textArea.setCaretPosition(textArea.viewToModel(new Point(startIndex.x, y))); pane.scrollRectToVisible(new Rectangle(startIndex.x, y)); } }
这是OUTPUT：
我认为在使用Highlighter的情况下，不能为所有JTextComponents更改这些方法，但是可以仅更改Foreground
例如
import java.awt.*; import javax.swing.*; import javax.swing.text.DefaultHighlighter; public class TextAreaLineHightLight { public static void main(String[] args) throws Exception { UIManager.put("TextArea.selectionBackground", Color.yellow); UIManager.put("TextArea.selectionForeground", Color.red); String string = "Lorem ipsum eum putant gubergren evertitur in, " + "no assueverit vituperatoribus eum. Ea cibo offendit vim, est et vivendum qualisque prodesset. " + "Vis doctus expetenda contentiones an, no ius mazim epicuri expetendis, " + "saperet salutandi forensibus ne usu. Ex fugit alterum usu. " + "His ignota cotidieque in, augue erroribus eam no."; JTextArea textArea = new JTextArea(string); textArea.setLineWrap(true); textArea.setWrapStyleWord(true); JScrollPane textAreaScroll = new JScrollPane(textArea); JFrame frame = new JFrame(); frame.setLayout(new BorderLayout()); frame.add(textAreaScroll, BorderLayout.CENTER); frame.setSize(400, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); String term = "qualisque prodesset. " + "Vis doctus expetenda contentiones an, no ius mazim epicuri expetendis"; int termOffset = string.indexOf(term); Rectangle view = textArea.modelToView(termOffset); int startOffset = textArea.viewToModel(new Point(0, view.y)); //int rowH = textArea. int endOffset = textArea.viewToModel(new Point(textArea.getSize().width, view.y)); textArea.getHighlighter().addHighlight(startOffset, endOffset, new DefaultHighlighter.DefaultHighlightPainter(Color.YELLOW)); } }
与JTextPane相同的结果
import java.awt.*; import javax.swing.*; import javax.swing.text.*; public class TextPaneHighlighting extends JFrame { private static final long serialVersionUID = 1L; private Highlighter.HighlightPainter cyanPainter; private Highlighter.HighlightPainter redPainter; public TextPaneHighlighting() { UIManager.put("TextPane.selectionBackground", Color.yellow); UIManager.put("TextPane.selectionForeground", Color.red); JTextPane textPane = new JTextPane(); textPane.setText("one\ntwo\nthree\nfour\nfive\nsix\nseven\neight\n"); JScrollPane scrollPane = new JScrollPane(textPane); getContentPane().add(scrollPane);// 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) { } } public static void main(String[] args) { TextPaneHighlighting frame = new TextPaneHighlighting(); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.setSize(300, 200); frame.setLocationRelativeTo(null); frame.setVisible(true); } }
要设置选择背景颜色，请使用setSelectionColor（如下所示但未使用）。
我真的不明白你说的是什么， 它总是出现在窗口的底部。 我想让它在顶部，但我猜测（我可能在这里错了）你的textarea在一个滚动窗格中，通过突出显示它滚动到你选择的结尾的文本，所以我建议设置插入位置突出显示文字后。
这是我理解的样本。 如果这不是您想要的，请告诉我：
import java.awt.Color; import java.net.MalformedURLException; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextArea; import javax.swing.SwingUtilities; import javax.swing.text.BadLocationException; import javax.swing.text.DefaultHighlighter; public class Test { public static void main(final String[] args) throws MalformedURLException { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { try { init(); } catch (BadLocationException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }); } private static void init() throws BadLocationException { JFrame frame = new JFrame(); final JTextArea textArea = new JTextArea(); JScrollPane pane = new JScrollPane(textArea); textArea.setText("Something. Something else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla\nBlabla\n"); textArea.setSelectionColor(Color.RED); frame.add(pane); frame.setSize(300, 120); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); String turnToString = "Something else.\nA second line\na third line" + "Blabla\nBlabla\nBlabla\nBlabla\nBlabla"; final int pos = textArea.getText().indexOf(turnToString); textArea.getHighlighter().addHighlight(pos, pos + turnToString.length(), new DefaultHighlighter.DefaultHighlightPainter(Color.yellow)); textArea.scrollRectToVisible(new Rectangle(0, 0, pane.getViewport().getWidth(), pane.getViewport().getHeight())); SwingUtilities.invokeLater(new Runnable() { @Override public void run() { textArea.setCaretPosition(pos); } }); } }
要解决2）使用modelToView获取第一个选定行的点。 然后使用Point使用scrollRectToVisible（注意：矩形的高度必须是您的视口高度）。