Poi 写入图片进入excel

public static void cacheWritePicture(BufferedImage bufferImg, Sheet sheet, Workbook wb, int width, int height, int col1, int row1, int col2, int row2) throws Exception {
        ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
        ImageIO.write(bufferImg, "jpg", byteArrayOut);
        SXSSFDrawing drawing = (SXSSFDrawing) sheet.createDrawingPatriarch();
        ClientAnchor anchor = drawing.createAnchor(
                XSSFShape.EMU_PER_PIXEL * 17,
                XSSFShape.EMU_PER_PIXEL * 17, 
                width,
                height,
                col1, row1, col2, row2);
        //画图的顶级管理器，一个sheet只能获取一个（一定要注意这点）
        //AnchorType.MOVE_AND_RESIZE,此时才可以设置图片的绝对宽度和高度,要不然,图片的宽度和高度,可能设置没有效果
        anchor.setAnchorType(AnchorType.MOVE_AND_RESIZE);
        //插入图片    
        drawing.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), XSSFWorkbook.PICTURE_TYPE_JPEG));
    }

anchor.setAnchorType(AnchorType.MOVE_AND_RESIZE);
//注意:这行代码是关键

XSSFShape.EMU_PER_PIXEL * 100