How to Encrypt and Decrypt file using java code

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.security.Key;

import javax.crypto.Cipher;

import javax.crypto.spec.SecretKeySpec;

public class EncriptDecrypt {

    

    private static final String ALGORITHM = "AES";

    private static final String TRANSFORMATION = "AES";

    

    public static void main(String args[]) throws Exception{

        

       EncriptDecrypt.decrypt(new File("c:\\encryptFile\\encr.xls"), new File("c:\\decryptFile\\decr.xls"));  

       EncriptDecrypt.encrypt(new File("c:\\test.xls"), new File("c:\\decryptFile\\encr.xls"));  

    }

    

       public static void encrypt(File inputFile, File outputFile)

            throws Exception {

        doCrypto(Cipher.ENCRYPT_MODE, inputFile, outputFile);

    }

    public static void decrypt(File inputFile, File outputFile)

            throws Exception {

        doCrypto(Cipher.DECRYPT_MODE, inputFile, outputFile);

    }

    

    private static void doCrypto(int cipherMode, File inputFile,

            File outputFile) throws Exception {

        try {

            byte[] keyLength = new byte[16];

            Key secretKey = new SecretKeySpec(keyLength, ALGORITHM);

            Cipher cipher = Cipher.getInstance(TRANSFORMATION);

            cipher.init(cipherMode, secretKey);

            FileInputStream inputStream = new FileInputStream(inputFile);

            byte[] inputBytes = new byte[(int) inputFile.length()];

            inputStream.read(inputBytes);

            byte[] outputBytes = cipher.doFinal(inputBytes);

            FileOutputStream outputStream = new FileOutputStream(outputFile);

            outputStream.write(outputBytes);

            inputStream.close();

            outputStream.close();

        } catch (Exception ex) {

            ex.printStackTrace();

        }

    }

    

}