A complete example of AES encryption algorithm implemented in java

The example in this article describes the AES encryption algorithm implemented in java. Share it with everyone for your reference, the details are as follows:

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import android.util.Base64;
/**
 * @author vipin.cb , vipin.cb@experionglobal.com <br>
 *     Sep 27, 2013, 5:18:34 PM <br>
 *     Package:- <b>com.veebow.util</b> <br>
 *     Project:- <b>Veebow</b>
 *     <p>
 */
public class AESCrypt {
  private final Cipher cipher;
  private final SecretKeySpec key;
  private AlgorithmParameterSpec spec;
  public static final String SEED_16_CHARACTER = "U1MjU1M0FDOUZ.Qz";
  public AESCrypt() throws Exception {
    // hash password with SHA-256 and crop the output to 128-bit for key
    MessageDigest digest = MessageDigest.getInstance("SHA-256");
    digest.update(SEED_16_CHARACTER.getBytes("UTF-8"));
    byte[] keyBytes = new byte[32];
    System.arraycopy(digest.digest(), 0, keyBytes, 0, keyBytes.length);
    cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
    key = new SecretKeySpec(keyBytes, "AES");
    spec = getIV();
  }
  public AlgorithmParameterSpec getIV() {
    byte[] iv = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, };
    IvParameterSpec ivParameterSpec;
    ivParameterSpec = new IvParameterSpec(iv);
    return ivParameterSpec;
  }
  public String encrypt(String plainText) throws Exception {
    cipher.init(Cipher.ENCRYPT_MODE, key, spec);
    byte[] encrypted = cipher.doFinal(plainText.getBytes("UTF-8"));
    String encryptedText = new String(Base64.encode(encrypted,
        Base64.DEFAULT), "UTF-8");
    return encryptedText;
  }
  public String decrypt(String cryptedText) throws Exception {
    cipher.init(Cipher.DECRYPT_MODE, key, spec);
    byte[] bytes = Base64.decode(cryptedText, Base64.DEFAULT);
    byte[] decrypted = cipher.doFinal(bytes);
    String decryptedText = new String(decrypted, "UTF-8");
    return decryptedText;
  }
}

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