将Java中的文件数据加密到同一文件

import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

public class FileEncryption {
    public static void main(String[] args) {
        String inputFile = "input.txt";
        String outputFile = "encrypted.txt";
        String password = "mySecretPassword";

        try {
            // 生成密钥
            SecureRandom secureRandom = new SecureRandom();
            byte[] keyBytes = new byte[16];
            secureRandom.nextBytes(keyBytes);
            SecretKey secretKey = new SecretKeySpec(keyBytes, "AES");

            // 初始化加密器
            Cipher cipher = Cipher.getInstance("AES");
            cipher.init(Cipher.ENCRYPT_MODE, secretKey);

            // 读取要加密的文件数据
            byte[] inputBytes = readFile(inputFile);

            // 加密文件数据
            byte[] encryptedBytes = cipher.doFinal(inputBytes);

            // 将加密后的数据写入文件
            writeFile(outputFile, encryptedBytes);

            System.out.println("文件加密成功！");
        } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException |
                IllegalBlockSizeException | BadPaddingException | IOException e) {
            e.printStackTrace();
        }
    }

    private static byte[] readFile(String filePath) throws IOException {
        File file = new File(filePath);
        byte[] fileData = new byte[(int) file.length()];
        try (FileInputStream fis = new FileInputStream(file)) {
            fis.read(fileData);
        }
        return fileData;
    }

    private static void writeFile(String filePath, byte[] data) throws IOException {
        try (FileOutputStream fos = new FileOutputStream(filePath)) {
            fos.write(data);
        }
    }
}