//add picture data to this workbook.

byte[] bytes = System.IO.File.ReadAllBytes(@"D:\MyProject\NPOIDemo\ShapeImage\image1.jpg");

int pictureIdx = hssfworkbook.AddPicture(bytes, HSSFWorkbook.PICTURE_TYPE_JPEG);

 

//create sheet

HSSFSheet sheet = hssfworkbook.CreateSheet("Sheet1");

 

// Create the drawing patriarch. This is the top level container for all shapes.

HSSFPatriarch patriarch = sheet.CreateDrawingPatriarch();

 

//add a picture

HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 1023, 0, 0, 0, 1, 3);

HSSFPicture pict = patriarch.CreatePicture(anchor, pictureIdx);

 

与画简单图形不同的是,首先要将图片读入到byte数组,然后添加到workbook中;最后调用的是patriarch.CreatePicture(anchor, pictureIdx)方法显示图片,而不是patriarch.CreateSimpleShape(anchor)方法。上面这段代码执行后生成的Excel文件样式如下:


      我们发现,插入的图片被拉伸填充在HSSFClientAnchor指定的区域。有时可能我们并不需要拉伸的效果,怎么办呢?很简单,在最后加上这样一句用来自动调节图片大小:

pict.Resize();

添加代码后再执行上述代码,生成的Excel样式如下:

图片已经自动伸缩到原始大小了。

posted on 2018-04-03 15:14  qqhfeng16  阅读(442)  评论(0编辑  收藏  举报