文本替换几乎是所有文本编辑器都支持的功能，但是要限制在编辑其中才可以执行该功能。本实例实现了制定文本文件的内容替换，并且不需要再编辑其中打开文本文件。
思路：
代码如下：
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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(); } }} |
效果如图：
原文：http://www.cnblogs.com/cysolo/p/3571419.html