java如何在Swing的JTextArea中执行正则表达式
我想用给定的正则表达式替换所有匹配的单词。我为此编写了代码。但是,它只是替换了它,但没有执行特定的操作。当我选择正则表达式,然后单击“全部替换”,它将替换为特定操作,而不是替换为给定的字符串/字符。 例如,我的输入是“\n”,匹配的字符串/字符替换为新行操作,而不是替换新行字符。请检查一下并帮助我。非常感谢。 我的代码:
public class RegularExp extends javax.swing.JFrame {
JTextArea text;
int i=0;
UndoManager undoManager = new UndoManager();
public RegularExp() {
initComponents();
text = new JTextArea();
replace.setEnabled(false);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
tp = new javax.swing.JTabbedPane();
jMenuBar1 = new javax.swing.JMenuBar();
fileMenu = new javax.swing.JMenu();
open = new javax.swing.JMenuItem();
replace = new javax.swing.JMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
fileMenu.setText("File");
open.setText("Open");
open.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
openActionPerformed(evt);
}
});
fileMenu.add(open);
replace.setText("Replace");
replace.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
replaceActionPerformed(evt);
}
});
fileMenu.add(replace);
jMenuBar1.add(fileMenu);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tp, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void replaceActionPerformed(java.awt.event.ActionEvent evt) {
JDialog replace_dialog=new JDialog(RegularExp.this);
replace_dialog.setTitle("Replace");
JLabel find_label=new JLabel("Find what");
final JTextField find_tf=new JTextField(10);
JLabel replace_label=new JLabel("Replace With");
final JTextField replace_tf=new JTextField(10);
final JCheckBox regx=new JCheckBox("Regular Expression");
JButton replaceAll=new JButton("Replace All");
replace_dialog.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.insets = new Insets(5, 5, 5, 5);
c.gridx = 0;
c.gridy = 0;
c.anchor = GridBagConstraints.WEST;
replace_dialog.add(find_label, c);
c.gridx++;
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1;
replace_dialog.add(find_tf, c);
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 2;
replace_dialog.add(replace_label, c);
c.gridx++;
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1;
replace_dialog.add(replace_tf, c);
c.gridx++;
c.gridx++;
c.gridwidth = 1;
c.fill = GridBagConstraints.HORIZONTAL;
replace_dialog.add(replaceAll, c);
c.gridx=0;
c.gridy++;
c.gridwidth = 1;
c.fill = GridBagConstraints.HORIZONTAL;
replace_dialog.add(regx, c);
replace_dialog.setSize(400,400);
replace_dialog.setLocationRelativeTo(null);
replace_dialog.pack();
replace_dialog.setVisible(true);
replaceAll.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if(regx.isSelected()){
int caret_pos=text.getCaretPosition();
text.setText(text.getText().replaceAll(find_tf.getText(),"\\"+ replace_tf.getText()));
text.setCaretPosition(caret_pos);
}
else {
int caret_pos=text.getCaretPosition();
text.setText(text.getText().replaceAll(find_tf.getText(), replace_tf.getText()));
text.setCaretPosition(caret_pos);
}
}
});
}
private void openActionPerformed(java.awt.event.ActionEvent evt) {
final JFileChooser jc = new JFileChooser();
int returnVal= jc.showOpenDialog(RegularExp.this);
String title;
File file=null;
if(returnVal == JFileChooser.APPROVE_OPTION)
file = jc.getSelectedFile();
if (jc.getSelectedFile()!= null) {
BufferedReader br = null;
StringBuffer str = new StringBuffer("");
try {
br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
str.append(line + "\n");
}
}
catch (IOException ex) {
Logger.getLogger(RegularExp.class.getName()).log(Level.SEVERE, null, ex);
}
String t = str.toString();
final JInternalFrame internalFrame = new JInternalFrame("",true,true);
title=file.getName();
text.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
internalFrame.add(text);
i+=1;
internalFrame.setName("Doc "+i);
JScrollPane scrollpane=new JScrollPane(text);
internalFrame.setTitle(title);
tp.add(internalFrame);
internalFrame.add(scrollpane);
internalFrame.setVisible(true);
text.setText(t);
text.setCaretPosition(0);
replace.setEnabled(true);
}
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(RegularExp.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(RegularExp.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(RegularExp.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(RegularExp.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new RegularExp().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JMenu fileMenu;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem open;
private javax.swing.JMenuItem replace;
private javax.swing.JTabbedPane tp;
// End of variables declaration
}
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