java messagedigest如何处理文件

Java MessageDigest ??????????????????????,?????? MessageDigest ???????? MD5 ???:

1. ??,????????:

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.nio.charset.StandardCharsets;
import java.util.Arrays;

2. ??????,?????????????,?????? MD5 ???:

public static String calculateMD5(String filePath) {
    try {
        // ???? MessageDigest ??,????? MD5
        MessageDigest md = MessageDigest.getInstance("MD5");

        // ?? FileInputStream ??????
        FileInputStream fis = new FileInputStream(new File(filePath));
        byte[] buffer = new byte[1024];
        int bytesRead;

        // ??????????? MessageDigest ??
        while ((bytesRead = fis.read(buffer)) != -1) {
            md.update(buffer, 0, bytesRead);
        }

        // ?? FileInputStream
        fis.close();

        // ?? MD5 ????????
        byte[] mdBytes = md.digest();

        // ???????????????
        StringBuilder sb = new StringBuilder();
        for (byte b : mdBytes) {
            sb.append(String.format("x", b));
        }

        return sb.toString();
    } catch (IOException | NoSuchAlgorithmException e) {
        e.printStackTrace();
        return null;
    }
}

3. ??????? calculateMD5 ??,??????,?????:

public static void main(String[] args) {
    String filePath = "path/to/your/file.txt";
    String md5Hash = calculateMD5(filePath);
    System.out.println("MD5 hash of the file: " + md5Hash);
}

??????????????,?????????????? MD5 ????????????????????????,???? SHA-256 ?? "MD5"?