使用分组加密算法CBC，用Java编程实现对任意大小文件的加解密中的InputStream inputStream怎么写。完整代码

以下是一个使用CBC分组加密算法对任意大小文件进行加解密的Java代码，包括了InputStream inputStream的实现：

import java.io.*;
import java.security.*;
import javax.crypto.*;
import javax.crypto.spec.*;

public class FileEncryptor {

    private static final int BUFFER_SIZE = 4096;

    public static void encryptFile(String inputFile, String outputFile, String keyString, String ivString)
            throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException,
            IOException {
        Key secretKey = new SecretKeySpec(keyString.getBytes(), "AES");
        IvParameterSpec iv = new IvParameterSpec(ivString.getBytes());
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);

        FileInputStream inputStream = new FileInputStream(inputFile);
        FileOutputStream outputStream = new FileOutputStream(outputFile);

        byte[] buffer = new byte[BUFFER_SIZE];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            byte[] encryptedBytes = cipher.update(buffer, 0, bytesRead);
            outputStream.write(encryptedBytes);
        }
        byte[] encryptedBytes = cipher.doFinal();
        outputStream.write(encryptedBytes);

        inputStream.close();
        outputStream.close();
    }

    public static void decryptFile(String inputFile, String outputFile, String keyString, String ivString)
            throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException,
            IOException {
        Key secretKey = new SecretKeySpec(keyString.getBytes(), "AES");
        IvParameterSpec iv = new IvParameterSpec(ivString.getBytes());
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);

        FileInputStream inputStream = new FileInputStream(inputFile);
        FileOutputStream outputStream = new FileOutputStream(outputFile);

        byte[] buffer = new byte[BUFFER_SIZE];
        int bytesRead;
        while ((bytesRead = inputStream.read(buffer)) != -1) {
            byte[] decryptedBytes = cipher.update(buffer, 0, bytesRead);
            outputStream.write(decryptedBytes);
        }
        byte[] decryptedBytes = cipher.doFinal();
        outputStream.write(decryptedBytes);

        inputStream.close();
        outputStream.close();
    }

    public static void main(String[] args) {
        try {
            String inputFile = "input.txt";
            String encryptedFile = "encrypted.bin";
            String decryptedFile = "decrypted.txt";
            String keyString = "0123456789abcdef";
            String ivString = "fedcba9876543210";

            encryptFile(inputFile, encryptedFile, keyString, ivString);
            decryptFile(encryptedFile, decryptedFile, keyString, ivString);

            System.out.println("Encryption and decryption completed.");
        } catch (Exception ex) {
            System.out.println("Error: " + ex.getMessage());
        }
    }
}

在encryptFile和decryptFile方法中，我们首先创建了一个SecretKeySpec对象和一个IvParameterSpec对象，它们分别用于指定加密密钥和初始化向量。然后我们创建了一个Cipher对象，它用于进行加密或解密操作。接下来我们创建了一个FileInputStream对象和一个FileOutputStream对象，分别用于读取和写入文件内容。我们使用一个while循环来循环读取文件内容并进行加密或解密操作，并将加密或解密后的结果写入到输出文件中。最后我们关闭了输入输出流。

在main方法中，我们测试了加密和解密操作，并打印了“Encryption and decryption completed.”消息。注意，我们使用的密钥和初始化向量是硬编码的，这是为了方便演示。在实际使用中，建议将密钥和初始化向量存储在安全的地方，例如在加密密钥管理系统中。