1 import javax.crypto.Cipher;
 2 import javax.crypto.spec.SecretKeySpec;
 3 import java.nio.charset.StandardCharsets;
 4 import java.util.Base64;
 5 
 6 public class AESUtils {
 7 
 8     private static final String AES_ALGORITHM = "AES/ECB/PKCS5Padding";
 9 
10     // 獲取 cipher
11     private static Cipher getCipher(byte
 
[] key, int model) throws Exception {
12         SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
13         Cipher cipher = Cipher.getInstance(AES_ALGORITHM);
14         cipher.init(model, secretKeySpec);
15         return cipher;
16     }
17 
18     // AES加密
19     public static String encrypt(byte
 
[] data, byte[] key) throws Exception {
20         Cipher cipher = getCipher(key, Cipher.ENCRYPT_MODE);
21         return Base64.getEncoder().encodeToString(cipher.doFinal(data));
22     }
23 
24     // AES解密
25     public static byte[] decrypt(byte[] data, byte[] key) throws Exception {
26         Cipher cipher = getCipher(key, Cipher.DECRYPT_MODE);
 
27         return cipher.doFinal(Base64.getDecoder().decode(data));
28     }
29 
30     public static void main(String[] args) throws Exception {
31         //這個字串就是鑰匙，必須是個16位的字串
32         String key = "1234567898765432";
33         byte[] kb = key.getBytes(StandardCharsets.UTF_8);
34         //加密
35         String encrypt = encrypt("要加密的內容".getBytes(StandardCharsets.UTF_8), kb);
36         System.out.println(encrypt);
37         //解密
38         byte[] decrypt = decrypt(encrypt.getBytes(StandardCharsets.UTF_8), kb);
39         System.out.println(new String(decrypt));
40     }
41 }