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在Java中，可以使用javax.crypto包中的Cipher类来实现AES加密算法。以下是一个简单的示例代码来演示如何使用AES加密算法对字符串进行加密和解密：
import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; import java.util.Base64; public class AESEncryption { public static SecretKey generateAESKey() throws Exception { KeyGenerator keyGenerator = KeyGenerator.getInstance("AES"); keyGenerator.init(128); return keyGenerator.generateKey(); } public static String encrypt(String data, SecretKey key) throws Exception { Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.ENCRYPT_MODE, key); byte[] encryptedBytes = cipher.doFinal(data.getBytes()); return Base64.getEncoder().encodeToString(encryptedBytes); } public static String decrypt(String encryptedData, SecretKey key) throws Exception { Cipher cipher = Cipher.getInstance("AES"); cipher.init(Cipher.DECRYPT_MODE, key); byte[] decryptedBytes = cipher.doFinal(Base64.getDecoder().decode(encryptedData)); return new String(decryptedBytes); } public static void main(String[] args) throws Exception { SecretKey key = generateAESKey(); String data = "Hello, AES!"; String encryptedData = encrypt(data, key); System.out.println("Encrypted data: " + encryptedData); String decryptedData = decrypt(encryptedData, key); System.out.println("Decrypted data: " + decryptedData); } } 在上面的示例中，我们首先使用generateAESKey()方法生成一个AES密钥，然后使用encrypt()方法对字符串进行加密，最后使用decrypt()方法将加密后的字符串解密。最后，我们在main()方法中演示了整个加密和解密的过程。
