import java.awt.BorderLayout; public class ReplaceFileText extends JFrame {     /**      *      */     private static final long serialVersionUID = 8674569541853793419L;     private JPanel contentPane;     private JTextField fileField;     private JTextField searchTextField;     private JTextField replaceTextField;     private File file;     /**      * Launch the application.      */     public static void main(String[] args) {         EventQueue.invokeLater(new Runnable() {             public void run() {                 try {                     ReplaceFileText frame = new ReplaceFileText();                     frame.setVisible(true);                 } catch (Exception e) {                     e.printStackTrace();                 }             }         });     }     /**      * Create the frame.      */     public ReplaceFileText() {         setResizable(false);         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         setBounds(100, 100, 501, 184);         contentPane = new JPanel();         contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));         contentPane.setLayout(new BorderLayout(0, 0));         setContentPane(contentPane);         JPanel panel = new JPanel();         panel.setPreferredSize(new Dimension(10, 91));         contentPane.add(panel, BorderLayout.CENTER);         GridBagLayout gbl_panel = new GridBagLayout();         gbl_panel.columnWidths = new int[] { 81, 0, 0, 66, 0 };         gbl_panel.rowHeights = new int[] { 23, 0, 0, 0, 0 };         gbl_panel.columnWeights = new double[] { 0.0, 0.0, 0.0, 1.0,                 Double.MIN_VALUE };         gbl_panel.rowWeights = new double[] { 0.0, 0.0, 0.0, 0.0,                 Double.MIN_VALUE };         panel.setLayout(gbl_panel);         JButton button = new JButton("选择文件");         button.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent e) {                 do_button_actionPerformed(e);             }         });         GridBagConstraints gbc_button = new GridBagConstraints();         gbc_button.anchor = GridBagConstraints.NORTHWEST;         gbc_button.insets = new Insets(0, 0, 5, 5);         gbc_button.gridx = 0;         gbc_button.gridy = 0;         panel.add(button, gbc_button);         fileField = new JTextField();         fileField.setEditable(false);         GridBagConstraints gbc_fileField = new GridBagConstraints();         gbc_fileField.gridwidth = 3;         gbc_fileField.insets = new Insets(0, 0, 5, 0);         gbc_fileField.fill = GridBagConstraints.HORIZONTAL;         gbc_fileField.gridx = 1;         gbc_fileField.gridy = 0;         panel.add(fileField, gbc_fileField);         fileField.setColumns(10);         JLabel label = new JLabel("搜索文本：");         GridBagConstraints gbc_label = new GridBagConstraints();         gbc_label.anchor = GridBagConstraints.EAST;         gbc_label.insets = new Insets(0, 0, 5, 5);         gbc_label.gridx = 0;         gbc_label.gridy = 1;         panel.add(label, gbc_label);         searchTextField = new JTextField();         GridBagConstraints gbc_searchTextField = new GridBagConstraints();         gbc_searchTextField.gridwidth = 3;         gbc_searchTextField.insets = new Insets(0, 0, 5, 0);         gbc_searchTextField.fill = GridBagConstraints.HORIZONTAL;         gbc_searchTextField.gridx = 1;         gbc_searchTextField.gridy = 1;         panel.add(searchTextField, gbc_searchTextField);         searchTextField.setColumns(10);         JLabel label_1 = new JLabel("替换为：");         GridBagConstraints gbc_label_1 = new GridBagConstraints();         gbc_label_1.anchor = GridBagConstraints.EAST;         gbc_label_1.insets = new Insets(0, 0, 5, 5);         gbc_label_1.gridx = 0;         gbc_label_1.gridy = 2;         panel.add(label_1, gbc_label_1);         replaceTextField = new JTextField();         GridBagConstraints gbc_replaceTextField = new GridBagConstraints();         gbc_replaceTextField.gridwidth = 3;         gbc_replaceTextField.insets = new Insets(0, 0, 5, 0);         gbc_replaceTextField.fill = GridBagConstraints.HORIZONTAL;         gbc_replaceTextField.gridx = 1;         gbc_replaceTextField.gridy = 2;         panel.add(replaceTextField, gbc_replaceTextField);         replaceTextField.setColumns(10);         JPanel panel_1 = new JPanel();         GridBagConstraints gbc_panel_1 = new GridBagConstraints();         gbc_panel_1.gridwidth = 4;         gbc_panel_1.fill = GridBagConstraints.BOTH;         gbc_panel_1.gridx = 0;         gbc_panel_1.gridy = 3;         panel.add(panel_1, gbc_panel_1);         JButton replaceButton = new JButton("替换");         replaceButton.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent e) {                 do_replaceButton_actionPerformed(e);             }         });         panel_1.add(replaceButton);         JButton openfileButton = new JButton("打开文件");         openfileButton.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent e) {                 do_button_2_actionPerformed(e);             }         });         panel_1.add(openfileButton);     }     /**      * 选择文件按钮事件处理方法      *      * @param e      */     protected void do_button_actionPerformed(ActionEvent e) {         JFileChooser chooser = new JFileChooser("./");// 创建文件选择器         // 设置文件扩展名过滤器         chooser.setFileFilter(new FileNameExtensionFilter("文本文件", "txt",                 "java", "php", "html", "htm"));         // 设置文件选择模式         chooser.setFileSelectionMode(JFileChooser.FILES_ONLY);         // 显示文件打开对话框         int option = chooser.showOpenDialog(this);         // 确定用户按下打开按钮，而非取消按钮         if (option != JFileChooser.APPROVE_OPTION)             return;         // 获取用户选择的文件对象         file = chooser.getSelectedFile();         // 显示文件信息到文本框         fileField.setText(file.toString());     }     /**      * 替换按钮的事件处理方法      *      * @param e      */     protected void do_replaceButton_actionPerformed(ActionEvent event) {         String searchText = searchTextField.getText();// 获取搜索文本         String replaceText = replaceTextField.getText();// 获取替换文本         if (searchText.isEmpty())             return;         try {             FileReader fis = new FileReader(file);// 创建文件输入流             char[] data = new char[1024];// 创建缓冲字符数组             int rn = 0;             StringBuilder sb = new StringBuilder();// 创建字符串构建器             while ((rn = fis.read(data)) > 0) {// 读取文件内容到字符串构建器                 String str = String.valueOf(data, 0, rn);                 sb.append(str);             }             fis.close();// 关闭输入流             // 从构建器中生成字符串，并替换搜索文本             String str = sb.toString().replace(searchText, replaceText);             FileWriter fout = new FileWriter(file);// 创建文件输出流             fout.write(str.toCharArray());// 把替换完成的字符串写入文件内             fout.close();// 关闭输出流         } catch (FileNotFoundException e) {             e.printStackTrace();         } catch (IOException e) {             e.printStackTrace();         }         JOptionPane.showMessageDialog(null, "替换完成");     }     /**      * 打开文件按钮的事件处理方法。      *      * @param e      */     protected void do_button_2_actionPerformed(ActionEvent e) {         try {             if (file == null)                 return;             Desktop.getDesktop().edit(file);         } catch (IOException e1) {             e1.printStackTrace();         }     } }