在java中写入unicode（Sindhi）的keyListener的实现问题
我希望通过这种方式在jTextField上实现keyListener来使用unicode：
textField.addKeyListener(new KeyListener() { @Override public void keyTyped(KeyEvent evt) { // TODO Auto-generated method stub } @Override public void keyReleased(KeyEvent arg0) { // TODO Auto-generated method stub } @Override public void keyPressed(KeyEvent evt) { // TODO Auto-generated method stub char var = evt.getKeyChar(); if(var == 'a'){ String values = urlTextField.getText() + Sindhi.ALIF; urlTextField.setText(values); } } });
但它用unicode字符Sindhi.ALIF写English字符a 。 如何只获取在jTextField编写的unicode字符
无论您当前的问题是什么，都不应该在JTextField中使用KeyListener。 请改用DocumentListener或DocumentFilter。 鉴于您的代码，我猜测DocumentFilter是您所需要的，因为您希望在输入时以及在显示之前更改JTextField的文本。
例如，
import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.DocumentFilter; import javax.swing.text.PlainDocument; public class SwapAForAleph { // No idea of the correct unicode for this!!! public static final char SINDHI_ALIF = '\u0623'; public static void main(String[] args) { final JTextField textField = new JTextField(10); textField.setFont(textField.getFont().deriveFont(32f)); PlainDocument doc = (PlainDocument) textField.getDocument(); doc.setDocumentFilter(new DocumentFilter() { @Override public void insertString(FilterBypass fb, int offset, String text, AttributeSet attr) throws BadLocationException { text = filterText(text); super.insertString(fb, offset, text, attr); } @Override public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException { text = filterText(text); super.replace(fb, offset, length, text, attrs); } private String filterText(String text) { return text.replace('a', SINDHI_ALIF); } }); JPanel panel = new JPanel(); panel.add(textField); JOptionPane.showMessageDialog(null, panel); } }
或以另一种方式看待……
import java.awt.ComponentOrientation; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JTextField; import javax.swing.SwingConstants; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.DocumentFilter; import javax.swing.text.PlainDocument; public class NonEnglishTextField { public static final char ALEPH = '\u05D0'; public static void main(String[] args) { final JTextField textField = new JTextField(20); textField.setFont(textField.getFont().deriveFont(32f)); textField.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT); textField.setHorizontalAlignment(SwingConstants.RIGHT); PlainDocument doc = (PlainDocument) textField.getDocument(); doc.setDocumentFilter(new DocumentFilter() { @Override public void insertString(FilterBypass fb, int offset, String text, AttributeSet attr) throws BadLocationException { text = filterText(text); super.insertString(fb, offset, text, attr); } @Override public void replace(FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException { text = filterText(text); super.replace(fb, offset, length, text, attrs); } private String filterText(String text) { StringBuilder sb = new StringBuilder(); for (char c : text.toLowerCase().toCharArray()) { if (c >= 'a' && c <= 'z') { char newChar = (char) (c - 'a' + ALEPH); sb.append(newChar); } else { sb.append(c); } } return sb.toString(); } }); JPanel panel = new JPanel(); panel.add(textField); JOptionPane.showMessageDialog(null, panel); } }
使用DocumentFilter。
当KeyListener重新生成事件时，该字符已添加到该字段中。
KeyListener也不会处理用户将内容粘贴到字段中