如何从HSSFWorkbook对象获取输入流

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class WorkbookToInputStream {
    public static void main(String[] args) throws IOException {
        // 创建一个HSSFWorkbook对象
        HSSFWorkbook workbook = new HSSFWorkbook();

        // 在这里添加一些数据到workbook中

        // 将HSSFWorkbook对象转换为输入流
        InputStream inputStream = convertWorkbookToInputStream(workbook);

        // 在这里处理输入流
    }

    public static InputStream convertWorkbookToInputStream(HSSFWorkbook workbook) throws IOException {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        workbook.write(outputStream);
        byte[] bytes = outputStream.toByteArray();
        return new ByteArrayInputStream(bytes);
    }
}