java加密解密AES实现

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加密时，先用AES加密，再用base64加密；解密时，先用base64解密，再用AES解密。

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);    }}

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