Spire.XLS for Java 14.2.4 では Kingdraw で描画された OLE オブジェクトを画像として保存することがサポートしています

	com.spire.xls.Workbook workbook = new com.spire.xls.Workbook();
	workbook.loadFromFile("data.xlsx");
	Worksheet sheet = workbook.getWorksheets().get(0);
	Object o =  sheet.getCellRange("C2").getFormulaValue();
	if (sheet.hasOleObjects()) {
		for (int i = 0; i < sheet.getOleObjects().size(); i++) {
			IOleObject oleObject = sheet.getOleObjects().get(i);
			OleObjectType oleObjectType = sheet.getOleObjects().get(i).getObjectType();
			byte[] picUrl = null;
			switch (oleObjectType) {
				case Emf:
					picUrl = oleObject.getOleData();;
					break;
			}
			if (picUrl != null) {
				byteArrayToFile(picUrl, "out.png");
				break;
			}
		}
	}
}

public static void byteArrayToFile(byte[] datas, String destPath) {
	File dest = new File(destPath);
	try (InputStream is = new ByteArrayInputStream(datas);
		 OutputStream os = new BufferedOutputStream(new FileOutputStream(dest, false));) {
		byte[] flush = new byte[1024];
		int len = -1;
		while ((len = is.read(flush)) != -1) {
			os.write(flush, 0, len);
		}
		os.flush();
	} catch (IOException e) {
		e.printStackTrace();
	}
}