Find and replace the content of a text file in Java

Text replacement is supported by almost all text editors, but it must be edited to perform this function. In this example, the content of a text file is replaced, and you do not need to edit it to open the text file.

Ideas:

The Code is as follows:

Import java. awt. borderLayout; public class ReplaceFileText extends JFrame {/***/private static final long serialVersionUID = bytes; 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); setdefaclocloseoperation (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 ("select file"); button. addActionListener (new ActionListener () {public void actionreceivmed (ActionEvent e) {do_button_actionreceivmed (e) ;}}); GridBagConstraints gbc_button = new GridBagConstraints (); response = gridbagconi NT. 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 (); encoding = 3; gbc_fileField.insets = new Insets (0, 0, 5, 0); gbc_fileField.fill = encoding. HORIZONTAL; gbc_fileField.gri Dx = 1; gbc_fileField.gridy = 0; panel. add (fileField, gbc_fileField); fileField. setColumns (10); JLabel label = new JLabel ("search text:"); 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 (); GridBagConstraint S 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 ("replace with:"); GridBagConstraints gbc_l Abel_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 outer (); outer = 3; outer = 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 (); records = 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 ("replace"); replaceButton. addActionListener (new ActionListener () {public void actionreceivmed (ActionEvent e) {do_replacebutton_actionreceivmed (e) ;}}); panel_1.add (replaceButton ); JButton openfileButton = new JButton ("Open File"); openfileButton. addActionListener (new ActionListener () {public void actionreceivmed (ActionEve Nt e) {do_button_2_actionreceivmed (e) ;}}); panel_1.add (openfileButton );} /*** select file button event processing method ** @ param e */protected void do_button_actionreceivmed (ActionEvent e) {JFileChooser chooser = new JFileChooser (". /"); // create a file selector // set the file extension filter chooser. setFileFilter (new FileNameExtensionFilter ("text file", "txt", "java", "php", "html", "htm"); // set the file selection mode to chooser. setFileSelectionMode (JFileChooser. FILES_ON LY); // display the file opening dialog box int option = chooser. showOpenDialog (this); // confirm that the user presses the OPEN button instead of the cancel button if (option! = JFileChooser. APPROVE_OPTION) return; // obtain the selected file object file = chooser. getSelectedFile (); // display the file information to the fileField in the text box. setText (file. toString ();}/*** replacement button event handling method ** @ param e */protected void do_replacebutton_actionreceivmed (ActionEvent event) {String searchText = searchTextField. getText (); // obtain the search text String replaceText = replaceTextField. getText (); // obtain the replaced text if (searchText. isEmpty () return; try {File Reader FD = new FileReader (file); // create a file input stream char [] data = new char [1024]; // create a buffer character array int rn = 0; stringBuilder sb = new StringBuilder (); // create a string builder while (rn = Fi. read (data)> 0) {// read the file content to the String builder String str = String. valueOf (data, 0, rn); sb. append (str);} fiis. close (); // close the input stream // generate a String from the builder and replace the search text String str = sb. toString (). replace (searchText, replaceText); FileWriter fout = new FileWriter (fi Le); // create the file output stream fout. write (str. toCharArray (); // write the replaced string to the fout file. close (); // close the output stream} catch (FileNotFoundException e) {e. printStackTrace ();} catch (IOException e) {e. printStackTrace ();} JOptionPane. showMessageDialog (null, "replaced");}/*** event handling method for opening the file button. ** @ Param e */protected void do_button_2_action1_med (ActionEvent e) {try {if (file = null) return; Desktop. getDesktop (). edit (file) ;}catch (IOException e1) {e1.printStackTrace ();}}}

Effect