使用AES算法对文件进行加密/解密的操作(JAVA)

很简单，直接上代码。

/**     * 初始化 AES Cipher     * @param sKey     * @param cipherMode     * @return     */    public Cipher initAESCipher(String sKey, int cipherMode) {        //创建Key gen        KeyGenerator keyGenerator = null;        Cipher cipher = null;        try {            keyGenerator = KeyGenerator.getInstance("AES");            keyGenerator.init(128, new SecureRandom(sKey.getBytes()));            SecretKey secretKey = keyGenerator.generateKey();            byte[] codeFormat = secretKey.getEncoded();            SecretKeySpec key = new SecretKeySpec(codeFormat, "AES");            cipher = Cipher.getInstance("AES");            //初始化            cipher.init(cipherMode, key);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.        } catch (NoSuchPaddingException e) {            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.        } catch (InvalidKeyException e) {            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.        }        return cipher;    }

AES加密文件操作

/**     * 对文件进行AES加密     * @param sourceFile     * @param fileType     * @param sKey     * @return     */    public File encryptFile(File sourceFile,String fileType, String sKey){        //新建临时加密文件        File encrypfile = null;        InputStream inputStream = null;        OutputStream outputStream = null;        try {            inputStream = new FileInputStream(sourceFile);            encrypfile = File.createTempFile(sourceFile.getName(), fileType);            outputStream = new FileOutputStream(encrypfile);            Cipher cipher = initAESCipher(sKey,Cipher.ENCRYPT_MODE);            //以加密流写入文件            CipherInputStream cipherInputStream = new CipherInputStream(inputStream, cipher);            byte[] cache = new byte[1024];            int nRead = 0;            while ((nRead = cipherInputStream.read(cache)) != -1) {                outputStream.write(cache, 0, nRead);                outputStream.flush();            }            cipherInputStream.close();        }  catch (FileNotFoundException e) {            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.        }  catch (IOException e) {            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.        } finally {            try {                inputStream.close();            } catch (IOException e) {                e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.            }            try {                outputStream.close();            } catch (IOException e) {                e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.            }        }        return encrypfile;    }

AES解密文件

/**     * AES方式解密文件     * @param sourceFile     * @return     */    public File decryptFile(File sourceFile,String fileType,String sKey){        File decryptFile = null;        InputStream inputStream = null;        OutputStream outputStream = null;        try {            decryptFile = File.createTempFile(sourceFile.getName(),fileType);            Cipher cipher = initAESCipher(sKey,Cipher.DECRYPT_MODE);            inputStream = new FileInputStream(sourceFile);            outputStream = new FileOutputStream(decryptFile);            CipherOutputStream cipherOutputStream = new CipherOutputStream(outputStream, cipher);            byte [] buffer = new byte [1024];            int r;            while ((r = inputStream.read(buffer)) >= 0) {                cipherOutputStream.write(buffer, 0, r);            }            cipherOutputStream.close();        } catch (IOException e) {            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.        }finally {            try {                inputStream.close();            } catch (IOException e) {                e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.            }            try {                outputStream.close();            } catch (IOException e) {                e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.            }        }        return decryptFile;    }

注意：对文件的读写操作一定要指定编码，否则会导致很多未知的编码问题。