直接上代碼，Base64使用的是Java8的方法，如沒有，替換即可

KEY：即密碼

IV：即偏移量，可自訂，十六位

加密方式：AES/CBC/PKCS5Padding，128位加密

如果想用256位和PKCS7Padding需要額外導入包

import javax.crypto.*;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
 
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Base64;

/**
 * 加解密工具
 *
 * @author hackyo
 * Created on 2017/12/13 18:33.
 */
public final class Encrypt {

    private static final String CBC_CIPHER_ALGORITHM = "AES/CBC/PKCS5Padding";
    private static final
 
 String KEY = "aaaaaaaa";
    private static final String IV = "abcdefghijklm123";
    private static SecretKey secretKey;

    static {
        try {
            KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
            keyGenerator.init(128, new SecureRandom(KEY.getBytes()));
            secretKey 
 
= new SecretKeySpec(keyGenerator.generateKey().getEncoded(), "AES");
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        String original = "加密我";
        String encodedText = aesEncode(original);
        System.out.println("密文（Base64加密後的密文）" + encodedText);
        System.out.println("原文（解密後）" + aesDecode(encodedText));
    }

    /**
     * AES加密
     *
     * @param original 原文
     * @return 密文
     */
    public static String aesEncode(String original) {
        try {
            Cipher cipher = Cipher.getInstance(CBC_CIPHER_ALGORITHM);
            cipher.init(Cipher.ENCRYPT_MODE, secretKey, new IvParameterSpec(IV.getBytes()));
            return Base64.getEncoder().encodeToString(cipher.doFinal(original.getBytes()));
        } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * AES解密
     *
     * @param ciphertext 密文
     * @return 原文
     */
    public static String aesDecode(String ciphertext) {
        try {
            Cipher cipher = Cipher.getInstance(CBC_CIPHER_ALGORITHM);
            cipher.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(IV.getBytes()));
            return new String(cipher.doFinal(Base64.getDecoder().decode(ciphertext)));
        } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | InvalidAlgorithmParameterException | IllegalBlockSizeException | BadPaddingException e) {
            e.printStackTrace();
        }
        return null;
    }

}

Java中的AES加解密