java代码参考

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Map;

public class DuplicateFileFinder {

    public static void main(String[] args) throws IOException, NoSuchAlgorithmException {
        String directoryPath = "your/directory/path";
        File directory = new File(directoryPath);

        // 使用 HashMap 存储文件的哈希值和路径
        Map<String, String> fileHashes = new HashMap<>();

        // 遍历目录中的文件
        findDuplicateFiles(directory, fileHashes);
    }

    // 遍历文件夹，递归查找文件
    public static void findDuplicateFiles(File directory, Map<String, String> fileHashes) throws IOException, NoSuchAlgorithmException {
        if (directory.isDirectory()) {
            // 获取目录中的所有文件
            File[] files = directory.listFiles();
            for (File file : files) {
                findDuplicateFiles(file, fileHashes); // 递归调用，遍历子目录
            }
        } else {
            // 对每个文件计算哈希值并比较
            String fileHash = calculateFileHash(directory);
            if (fileHashes.containsKey(fileHash)) {
                System.out.println("重复文件：" + directory.getAbsolutePath() + " 和 " + fileHashes.get(fileHash));
            } else {
                fileHashes.put(fileHash, directory.getAbsolutePath());
            }
        }
    }

    // 计算文件的哈希值
    public static String calculateFileHash(File file) throws IOException, NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        FileInputStream fis = new FileInputStream(file);
        byte[] byteArray = new byte[1024];
        int bytesRead;

        while ((bytesRead = fis.read(byteArray)) != -1) {
            md.update(byteArray, 0, bytesRead);
        }

        byte[] digest = md.digest();
        StringBuilder sb = new StringBuilder();

        for (byte b : digest) {
            sb.append(String.format("%02x", b));
        }
        fis.close();

        return sb.toString();
    }
}