您的嵌入对象在第5张图纸的图纸图形中的形状中可见。
若要获取对象数据，可以覆盖该绘图的所有形状。如果形状是XSSFObjectData的示例，则它是对象数据形状。如果内容类型是“application/vnd.openxmlformats-officedocument.spreadsheetml.sheet”，则对象数据形状链接到包含Office Open XML格式的Excel电子表格数据的包部件（XSSF）。如果是，那么您可以从该包部分的输入流中获得XSSFWorkbook。
示例代码：

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.*;

import java.io.FileInputStream;

class ExcelGetEmbeddedFromShape {

 public static void main(String[] args) throws Exception {

  String filename = "./ExcelWithEmbedded.xlsx";
  Workbook workbook = WorkbookFactory.create(new FileInputStream(filename));
  Sheet sheet = workbook.getSheetAt(4);

  Drawing drawing = sheet.getDrawingPatriarch();
  if (drawing instanceof XSSFDrawing) {
   for (XSSFShape shape : ((XSSFDrawing)drawing).getShapes()) {
    if (shape instanceof XSSFObjectData) {
     XSSFObjectData objectData = (XSSFObjectData)shape;   
     if ("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet".equals(objectData.getContentType())) {
      XSSFWorkbook embeddedWorkbook = (XSSFWorkbook)WorkbookFactory.create(objectData.getObjectPart().getInputStream());
      System.out.println(embeddedWorkbook);
      //... do something with embeddedWorkbook ...
     }
    }
   }
  }

  workbook.close();
 }
}

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