public String SM4encryptCBC(String data) { if (StringUtils.isEmpty(data)) { return ""; } sm4 = new SM4Utils(secretKey.trim(), iv.trim()); return sm4.encryptData_CBC(data); }换成JDK11的类

JDK11中没有内置SM4加密算法的类库，需要使用第三方库或自行实现。可以考虑使用Bouncy Castle库来实现SM4加密。

使用Bouncy Castle库的示例代码如下：

import org.bouncycastle.crypto.BlockCipher;
import org.bouncycastle.crypto.BufferedBlockCipher;
import org.bouncycastle.crypto.engines.SM4Engine;
import org.bouncycastle.crypto.modes.CBCBlockCipher;
import org.bouncycastle.crypto.paddings.PaddedBufferedBlockCipher;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import java.nio.charset.StandardCharsets;
import java.security.SecureRandom;
import java.util.Base64;

public class SM4Utils {

    private static final int BLOCK_SIZE = 16;

    private byte[] keyBytes;
    private byte[] ivBytes;

    public SM4Utils(String key, String iv) {
        this.keyBytes = key.getBytes(StandardCharsets.UTF_8);
        this.ivBytes = iv.getBytes(StandardCharsets.UTF_8);
    }

    public String encryptData_CBC(String data) {
        try {
            byte[] rawData = data.getBytes(StandardCharsets.UTF_8);

            // Generate a random IV
            byte[] iv = new byte[BLOCK_SIZE];
            new SecureRandom().nextBytes(iv);

            // Initialize the SM4 cipher in CBC mode with padding
            BlockCipher cipher = new SM4Engine();
            BufferedBlockCipher cipherWithPadding = new PaddedBufferedBlockCipher(new CBCBlockCipher(cipher));

            // Set the key and IV
            cipherWithPadding.init(true, new ParametersWithIV(new KeyParameter(keyBytes), ivBytes));

            // Encrypt the data
            byte[] encryptedData = new byte[cipherWithPadding.getOutputSize(rawData.length)];
            int numBytesProcessed = cipherWithPadding.processBytes(rawData, 0, rawData.length, encryptedData, 0);
            cipherWithPadding.doFinal(encryptedData, numBytesProcessed);

            // Combine the IV and encrypted data
            byte[] combinedData = new byte[iv.length + encryptedData.length];
            System.arraycopy(iv, 0, combinedData, 0, iv.length);
            System.arraycopy(encryptedData, 0, combinedData, iv.length, encryptedData.length);

            // Return the encrypted data as a Base64-encoded string
            return Base64.getEncoder().encodeToString(combinedData);
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }
}

你可以使用这段代码来替换原来使用的SM4Utils。注意，这段代码仅供参考，需要根据你的具体需求进行修改和优化。