如何从apache POI XWPFDocument获取图形？

import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFPictureData;
import org.apache.poi.xwpf.usermodel.XWPFRun;

import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;

public class ApachePOIExample {
    public static void main(String[] args) {
        try {
            // 加载Word文档
            XWPFDocument document = new XWPFDocument(ApachePOIExample.class.getResourceAsStream("example.docx"));

            // 获取文档中的所有图形
            List<XWPFPictureData> pictures = document.getAllPictures();

            // 遍历图形列表
            for (int i = 0; i < pictures.size(); i++) {
                XWPFPictureData pictureData = pictures.get(i);

                // 获取图形的二进制数据
                byte[] pictureBytes = pictureData.getData();

                // 将图形保存到本地文件
                FileOutputStream fos = new FileOutputStream("picture" + i + ".png");
                fos.write(pictureBytes);
                fos.close();
            }

            System.out.println("图形保存成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}