replace all string in directory using java code

here is the code for replacing all string in selected directory.

import java.io.*;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.Scanner;


public class StringReplacer {


    public static void main(String[] args) {
        String sourcedir = "C:\\Users\\username\\Desktop\\BarikVM-SharedFolder\\loader\\databackup_sh";
        String searchtext = "/home/$USER/Desktop/mytask/create_backup_dir.sh";
        String replacestring = "/bahay/$USER/Desktop/mytask/create_backup_dir.sh";

        String logfile = "log.txt";

        try {
            // Clear the log file
            Files.deleteIfExists(Paths.get(logfile));

            // Walk through files in sourcedir and its subdirectories

            Files.walkFileTree(Paths.get(sourcedir), new SimpleFileVisitor<Path>() {
                @Override

                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
                    File tempFile = new File(file.toString() + ".tmp");
                    boolean fileModified = false;


                    try (BufferedReader reader = new BufferedReader(new FileReader(file.toFile()));
                         BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile));
                         PrintWriter logWriter = new PrintWriter(new BufferedWriter(new FileWriter(logfile, true)))) {

                        String line;
                        int lineNumber = 0;

                        while ((line = reader.readLine()) != null) {
                            lineNumber++;
                            if (line.contains(searchtext)) {
                                System.out.println("Found \"" + searchtext + "\" in " + file + " on line " + lineNumber);
                                Scanner scanner = new Scanner(System.in);
                                System.out.print("Replace this occurrence? (y/n): ");
                                String confirm = scanner.nextLine();
                                if (confirm.equalsIgnoreCase("y")) {
                                    line = line.replace(searchtext, replacestring);
                                    logWriter.println("Replaced \"" + searchtext + "\" with \"" + replacestring + "\" in " + file + " on line " + lineNumber);
                                    fileModified = true;
                                } else {
                                    logWriter.println("Skipped replacing \"" + searchtext + "\" in " + file + " on line " + lineNumber);
                                }
                            }
                            writer.write(line);
                            writer.newLine();
                        }
                    }

                    // Ensure readers and writers are closed before deleting or moving files
                    if (fileModified) {
                        Files.delete(file);  // Delete the original file
                        Files.move(tempFile.toPath(), file);  // Replace it with the modified file
                    } else {
                        Files.delete(tempFile.toPath());  // Clean up the temp file if not used
                    }
                    return FileVisitResult.CONTINUE;
                }
            });
            System.out.println("Done!");
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}

Last update on Aug 07, 2024

Tags: java, string, replace, file