如何使用Java查找此校验和

import java.io.FileInputStream;
import java.security.MessageDigest;

public static String calculateChecksum(String filePath, String algorithm) throws Exception {
    MessageDigest md = MessageDigest.getInstance(algorithm);
    FileInputStream fis = new FileInputStream(filePath);
    byte[] dataBytes = new byte[1024];
    int bytesRead;
    while ((bytesRead = fis.read(dataBytes)) != -1) {
        md.update(dataBytes, 0, bytesRead);
    }
    byte[] checksumBytes = md.digest();
    StringBuilder checksum = new StringBuilder();
    for (byte b : checksumBytes) {
        checksum.append(Integer.toString((b & 0xff) + 0x100, 16).substring(1));
    }
    fis.close();
    return checksum.toString();
}

String filePath = "path/to/file";
String algorithm = "MD5";
try {
    String checksum = calculateChecksum(filePath, algorithm);
    System.out.println("Checksum: " + checksum);
} catch (Exception e) {
    e.printStackTrace();
}