Java开箱即用地包含AES。Rijndael是AES。您不需要任何外部库。您只需要这样的东西：
byte[] sessionKey = null; //Where you get this from is beyond the scope of this post
byte[] iv = null ; //Ditto
byte[] plaintext = null; //Whatever you want to encrypt/decrypt
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
//You can use ENCRYPT_MODE or DECRYPT_MODE
cipher.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(sessionKey, "AES"), new IvParameterSpec(iv));
byte[] ciphertext = cipher.doFinal(plaintext);
就是这样，用于加密/解密。如果要处理大量数据，则最好读取16字节倍数的块，然后调用update而不是doFinal（您只需在最后一个块上调用doFinal）。
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