如何将一个文本分成16个字节的块？

import java.nio.charset.StandardCharsets;

public class TextBlockSplitter {
    public static void main(String[] args) {
        String text = "This is a sample text to be split into 16-byte blocks.";
        byte[] textBytes = text.getBytes(StandardCharsets.UTF_8);

        int length = textBytes.length;
        if (length <= 16) {
            // 文本长度小于等于16，无需分割
            System.out.println("Text block: " + text);
        } else {
            // 分割文本成多个块
            int numBlocks = (int) Math.ceil((double) length / 16);
            for (int i = 0; i < numBlocks; i++) {
                int startIndex = i * 16;
                int endIndex = Math.min(startIndex + 16, length);
                byte[] block = new byte[endIndex - startIndex];
                System.arraycopy(textBytes, startIndex, block, 0, block.length);
                System.out.println("Block " + (i + 1) + ": " + new String(block, StandardCharsets.UTF_8));
            }
        }
    }
}