Base64 transcoding after AES encryption

package com.tickets.util;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.apache.log4j.Logger;

/**
 * Encryption and decryption tools
 * @author ljw
 * December 25, 2017
 */
public class PwdUtil {
  static Logger logger = Logger.getLogger(PwdUtil.class);

  /**
   * Encrypted
   *
   * @param content
   * Content that needs to be encrypted
   * @param password
   * Encrypted password
   * @return
   */
  public static String encrypt(String content, String password) throws Exception {
    try {
      byte[] raw = password.getBytes("UTF-8");
      if (raw.length != 16) {
        throw new IllegalArgumentException("Invalid key size. " + password + ", key token length is not 16 bits");
      }
      javax.crypto.spec.SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
      javax.crypto.Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
      cipher.init(Cipher.ENCRYPT_MODE, skeySpec,
          new javax.crypto.spec.IvParameterSpec(new byte[16])); // zero
      byte[] fina = cipher.doFinal(content.getBytes("UTF-8"));
      return new String(org.apache.commons.codec.binary.Base64.encodeBase64(fina));
    } catch (Exception e) {
      logger.error(e.getMessage(), e);
      throw e;
    }
  }

  /**
   * decrypt
   *
   * @param content
   * Content that needs to be decrypted
   * @param password
   * Encrypted password
   * @return
   */
  public static String decrypt(String content, String password) throws Exception {
    try {
      byte[] raw = password.getBytes("UTF-8");
      if (raw.length != 16) {
        throw new IllegalArgumentException("Invalid key size. " + password + ", key token length is not 16 bits");
      }
      SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
      Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
      cipher.init(Cipher.DECRYPT_MODE, skeySpec, new IvParameterSpec(new byte[16]));
      byte[] toDecrypt = org.apache.commons.codec.binary.Base64.decodeBase64(content.getBytes());
      byte[] original = cipher.doFinal(toDecrypt);
      return new String(original, "UTF-8");
    } catch (IllegalArgumentException e) {
      logger.error(e.getMessage(), e);
      throw e;
    } catch (Exception e) {
      logger.error(e.getMessage(), e);
    }
    return null;
  }

}