import java.io.*;

public class FileContentReplacer {

    public static void main(String[] args) {
        // 指定路径下的文件夹路径
        String directoryPath = "E:\\java-demo\\business";

        // 要查找和替换的字符串
        String searchString = "ds_C";
        String replacementString = "所念皆星河";

        // 调用递归方法替换文件夹中的内容
        replaceContentInDirectory(directoryPath, searchString, replacementString);
    }

    public static void replaceContentInDirectory(String directoryPath, String searchString, String replacementString) {
        File directory = new File(directoryPath);
        File[] files = directory.listFiles();

        if (files != null) {
            for (File file : files) {
                if (file.isDirectory()) {
                    // 如果是文件夹，则递归调用
                    replaceContentInDirectory(file.getAbsolutePath(), searchString, replacementString);
                } else {
                    // 如果是文件，则替换文件内容
                    replaceContentInFile(file, searchString, replacementString);
                }
            }
        }
    }

    public static void replaceContentInFile(File file, String searchString, String replacementString) {
        try {
            // 读取文件内容
            BufferedReader reader = new BufferedReader(new FileReader(file));
            StringBuilder stringBuilder = new StringBuilder();
            String line;

            while ((line = reader.readLine()) != null) {
                // 替换文件中的字符串
                line = line.replaceAll(searchString, replacementString);
                stringBuilder.append(line).append("\n");
            }
            reader.close();

            // 将替换后的内容写回文件
            BufferedWriter writer = new BufferedWriter(new FileWriter(file));
            writer.write(stringBuilder.toString());
            writer.close();

            System.out.println("文件 " + file.getAbsolutePath() + " 中的字符串替换完成。");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}