如何在Linux上的Java中使用SHA256 MessageDigest

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public static String calculateSHA256(String input) throws NoSuchAlgorithmException {
    MessageDigest md = MessageDigest.getInstance("SHA-256");
    byte[] hash = md.digest(input.getBytes());
    StringBuilder hexString = new StringBuilder();
    for (byte b : hash) {
        String hex = Integer.toHexString(0xff & b);
        if (hex.length() == 1) {
            hexString.append('0');
        }
        hexString.append(hex);
    }
    return hexString.toString();
}

String input = "Hello, World!";
try {
    String sha256Hash = calculateSHA256(input);
    System.out.println("SHA256 Hash: " + sha256Hash);
} catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
}