aes 256 cbc java code

AES 256 CBC 加密是高级加密标准（Advanced Encryption Standard）的一种加密模式。它在 Java 中可以通过使用 Java Cryptography Architecture (JCA) 中的 Java Cryptography Extension (JCE) 来实现。下面是一个 AES 256 CBC 加密的 Java 代码示例：

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 AES256CBCExample {
    private static final String key = "Your secret key"; // 32 bytes for AES-256
    private static final String initVector = "Your init vector"; // 16 bytes for AES-128 / AES-192 / AES-256
    public static String encrypt(String value) {
        try {
            IvParameterSpec iv = new IvParameterSpec(initVector.getBytes(StandardCharsets.UTF_8));
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
            byte[] encrypted = cipher.doFinal(value.getBytes());
            return Base64.getEncoder().encodeToString(encrypted);
        } catch (Exception ex) {
            ex.printStackTrace();
        return null;
    public static String decrypt(String encrypted) {
        try {
            IvParameterSpec iv = new IvParameterSpec(initVector.getBytes(StandardCharsets.UTF_8));
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(StandardCharsets.UTF_8), "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] original = cipher.doFinal(Base64.getDecoder().decode(encrypted));
            return new String(original);
        } catch (Exception ex) {
            ex.printStackTrace();
        return null;
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