java怎么实现aes加密算法

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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);
    }
}