aes加密算法javacbc

下面是一个使用Java实现AES加密算法的示例代码，采用CBC模式：

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

public class AESUtil {
    
    private static final String ALGORITHM = "AES/CBC/PKCS5Padding";
    private static final String IV_PARAMETER_SPEC = "0123456789ABCDEF";
    private static final String KEY_SPEC = "0123456789ABCDEF0123456789ABCDEF";
    
    public static String encrypt(String data) throws Exception {
        byte[] iv = IV_PARAMETER_SPEC.getBytes(StandardCharsets.UTF_8);
        byte[] key = KEY_SPEC.getBytes(StandardCharsets.UTF_8);
        SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);
        byte[] encrypted = cipher.doFinal(data.getBytes(StandardCharsets.UTF_8));
        return Base64.getEncoder().encodeToString(encrypted);
    }
    
    public static String decrypt(String encryptedData) throws Exception {
        byte[] iv = IV_PARAMETER_SPEC.getBytes(StandardCharsets.UTF_8);
        byte[] key = KEY_SPEC.getBytes(StandardCharsets.UTF_8);
        SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
        Cipher cipher = Cipher.getInstance(ALGORITHM);
        cipher.init(Cipher.DECRYPT_MODE, secretKeySpec, ivParameterSpec);
        byte[] decrypted = cipher.doFinal(Base64.getDecoder().decode(encryptedData));
        return new String(decrypted, StandardCharsets.UTF_8);
    }
    
}

其中，IV_PARAMETER_SPEC和KEY_SPEC分别表示初始化向量和密钥，需要根据具体的应用场景进行设置。使用示例：

public static void main(String[] args) throws Exception {
    String data = "Hello, World!";
    String encryptedData = AESUtil.encrypt(data);
    System.out.println("Encrypted data: " + encryptedData);
    String decryptedData = AESUtil.decrypt(encryptedData);
    System.out.println("Decrypted data: " + decryptedData);
}