excel插入图片如果是嵌入单元格图片无法获取数据，浮动图片是可以的

[dunkboy]

poi的如下方法无法获取嵌入单元格的图片，返回xssfDrawing == null ctDrawing == nul

private void getAllPictures(Sheet sheet) {
if (sheet instanceof XSSFSheet) {
this.isXSSFSheet = true;
XSSFDrawing xssfDrawing = ((XSSFSheet)sheet).getDrawingPatriarch();
if (xssfDrawing == null) {
return;
}

public XSSFDrawing getDrawingPatriarch() {
CTDrawing ctDrawing = this.getCTDrawing();
if (ctDrawing != null) {
Iterator var2 = this.getRelationParts().iterator();