在Java中用于文件唯一性的哈希

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class FileHash {
    public static void main(String[] args) {
        String filePath = "path/to/your/file";
        try {
            String hash = calculateFileHash(filePath);
            System.out.println("File hash: " + hash);
        } catch (IOException | NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }

    public static String calculateFileHash(String filePath) throws IOException, NoSuchAlgorithmException {
        MessageDigest md = MessageDigest.getInstance("SHA-256");
        try (FileInputStream fis = new FileInputStream(new File(filePath))) {
            byte[] dataBytes = new byte[1024];
            int nread;
            while ((nread = fis.read(dataBytes)) != -1) {
                md.update(dataBytes, 0, nread);
            };
        }
        byte[] mdbytes = md.digest();
        StringBuilder sb = new StringBuilder();
        for (byte mdbyte : mdbytes) {
            sb.append(Integer.toString((mdbyte & 0xff) + 0x100, 16).substring(1));
        }
        return sb.toString();
    }
}