pom.xml先引入依賴：

<dependency>
    <groupId>org.bouncycastle</groupId>
    <artifactId>bcprov-jdk15on</artifactId>
    <version>1.60</version>
</dependency>

import org.apache.commons.net.util.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

/**
 * @Auther: 
 * @Date: 2018/10/19 15:49
 * @Description:
 */
public class AESUtil {
    static Logger logger = LoggerFactory.getLogger(AESUtil.class);
    // 金鑰
    public static String key = "AD42F6697B035B7580E4FEF93BE20BAD";
    private static String charset = "utf-8";
    // 偏移量
    private static int offset = 16;
    // 加密器型別:加密演算法為AES,加密模式為CBC,補碼方式為PKCS5Padding
    private static String transformation = "AES/CBC/PKCS5Padding";
    // 演算法型別：用於指定生成AES的金鑰
    private static String algorithm = "AES";

    /**
     * 加密
     *
     * @param content
     * @return
     */
    public static String encrypt(String content) {
        return encrypt(content, key);
    }

    /**
     * 解密
     *
     * @param content
     * @return
     */
    public static String decrypt(String content) {
        return decrypt(content, key);
    }

    /**
     * 加密
     *
     * @param content 需要加密的內容
     * @param key     加密密碼
     * @return
     */
    public static String encrypt(String content, String key) {
        try {
            //構造金鑰
            SecretKeySpec skey = new SecretKeySpec(key.getBytes(), algorithm);
            //建立初始向量iv用於指定金鑰偏移量(可自行指定但必須為128位)，因為AES是分組加密，下一組的iv就用上一組加密的密文來充當
            IvParameterSpec iv = new IvParameterSpec(key.getBytes(), 0, offset);
            //建立AES加密器
            Cipher cipher = Cipher.getInstance(transformation);
            byte[] byteContent = content.getBytes(charset);
            //使用加密器的加密模式
            cipher.init(Cipher.ENCRYPT_MODE, skey, iv);
            // 加密
            byte[] result = cipher.doFinal(byteContent);
            //使用BASE64對加密後的二進位制陣列進行編碼
            return new Base64().encodeToString(result);
        } catch (Exception e) {
            logger.info("", e);
        }
        return null;
    }

    /**
     * AES（256）解密
     *
     * @param content 待解密內容
     * @param key     解密金鑰
     * @return 解密之後
     * @throws Exception
     */
    public static String decrypt(String content, String key) {
        try {

            SecretKeySpec skey = new SecretKeySpec(key.getBytes(), algorithm);
            IvParameterSpec iv = new IvParameterSpec(key.getBytes(), 0, offset);
            Cipher cipher = Cipher.getInstance(transformation);
            //解密時使用加密器的解密模式
            cipher.init(Cipher.DECRYPT_MODE, skey, iv);// 初始化
            byte[] result = cipher.doFinal(new Base64().decode(content));
            return new String(result); // 解密
        } catch (Exception e) {
            logger.info("", e);
        }
        return null;
    }

    public static void main(String[] args) {
        String s = "hello World!123.加解密";
        String encryptResultStr = encrypt(s);
        // 加密
        System.out.println("加密前：" + s);
        System.out.println("加密後：" + encryptResultStr);
        // 解密
        System.out.println("解密後：" + decrypt(encryptResultStr));
    }
}