java加密解密AES实现

import org.apache.commons.io.FileUtils;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import java.io.File;
import java.io.IOException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;

/**
* Created by fhqplzj on 2017/11/15.
*/
public class AESDemo {
private static final String algorithm = "AES";

private static Key getSecretKey() {
try {
KeyGenerator keyGenerator = KeyGenerator.getInstance(algorithm);
SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");
secureRandom.setSeed(47);
keyGenerator.init(128, secureRandom);
return keyGenerator.generateKey();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return null;
}

private static void encrypt(File src_file) {
try {
Cipher cipher = Cipher.getInstance(algorithm);
cipher.init(Cipher.ENCRYPT_MODE, getSecretKey());
byte[] encode_bytes = cipher.doFinal(FileUtils.readFileToByteArray(src_file));

BASE64Encoder base64Encoder = new BASE64Encoder();
FileUtils.writeStringToFile(src_file, base64Encoder.encode(encode_bytes));
} catch (Exception e) {
e.printStackTrace();
}
}

private static void decrypt(File src_file) {
try {
BASE64Decoder base64Decoder = new BASE64Decoder();
byte[] decode_bytes = base64Decoder.decodeBuffer(FileUtils.readFileToString(src_file));

Cipher cipher = Cipher.getInstance(algorithm);
cipher.init(Cipher.DECRYPT_MODE, getSecretKey());
FileUtils.writeByteArrayToFile(src_file, cipher.doFinal(decode_bytes));
} catch (Exception e) {
e.printStackTrace();
}
}

public static void main(String[] args) throws NoSuchAlgorithmException, IOException {
File file = new File("/Users/fhqplzj/train.txt");
decrypt(file);
}
}