密码加密

可选MD5或者SHA-256

package example.utils;

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

public class PasswordHashing {
    public static String hashPassword(String password, String algorithm) {
        try {
            MessageDigest digest = MessageDigest.getInstance(algorithm);
            byte[] hashedBytes = digest.digest(password.getBytes());
            StringBuilder hexString = new StringBuilder();
            for (byte b : hashedBytes) {
                String hex = Integer.toHexString(0xff & b);
                if (hex.length() == 1) hexString.append('0');
                hexString.append(hex);
            }
            return hexString.toString();
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException("Error: " + e.getMessage());
        }
    }

    public static void main(String[] args) {
        String password = "123";
        System.out.println("MD5: " + hashPassword(password, "MD5"));
        System.out.println("SHA-256: " + hashPassword(password, "SHA-256"));
    }
}

示例结果如下：

MD5: 202cb962ac59075b964b07152d234b70
SHA-256: a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3