java poi 在excel中插入图片

java web中导出excel数据是常见的功能，最近遇到一个需求是在excel中插入图片。处理excel及其他微软办公系列软件常用的就是apache poi，它也是支持图片插入的。插入图片最主要的用到HSSFClientAnchor，HSSFClientAnchor的文档介绍如下：

public HSSFClientAnchor(int dx1,
                int dy1,
                int dx2,
                int dy2,
                short col1,
                int row1,
                short col2,
                int row2)

Creates a new client anchor and sets the top-left and bottom-right coordinates of the anchor. Note: Microsoft Excel seems to sometimes disallow higher y1 than y2 or higher x1 than x2, you might need to reverse them and draw shapes vertically or horizontally flipped!

参数说明:

dx1 - the x coordinate within the first cell.//定义了图片在第一个cell内的偏移x坐标，既左上角所在cell的偏移x坐标，一般可设0
dy1 - the y coordinate within the first cell.//定义了图片在第一个cell的偏移y坐标，既左上角所在cell的偏移y坐标，一般可设0
dx2 - the x coordinate within the second cell.//定义了图片在第二个cell的偏移x坐标，既右下角所在cell的偏移x坐标，一般可设0
dy2 - the y coordinate within the second cell.//定义了图片在第二个cell的偏移y坐标，既右下角所在cell的偏移y坐标，一般可设0
col1 - the column (0 based) of the first cell.//第一个cell所在列，既图片左上角所在列
row1 - the row (0 based) of the first cell.//图片左上角所在行
col2 - the column (0 based) of the second cell.//图片右下角所在列

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import javax.imageio.ImageIO;
 
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 
public class ExcelExport {
 
    public static void main(String[] args) {
         FileOutputStream fileOut = null;   
         BufferedImage bufferImg = null;   
        try {
            ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
          //加载图片
            bufferImg = ImageIO.read(new File("e:/1.jpg"));   
            ImageIO.write(bufferImg, "jpg", byteArrayOut);
            HSSFWorkbook wb = new HSSFWorkbook();   
            HSSFSheet sheet1 = wb.createSheet("sheet1");  
            HSSFPatriarch patriarch = sheet1.createDrawingPatriarch();   
            /**
             	dx1 - the x coordinate within the first cell.//定义了图片在第一个cell内的偏移x坐标，既左上角所在cell的偏移x坐标，一般可设0
				dy1 - the y coordinate within the first cell.//定义了图片在第一个cell的偏移y坐标，既左上角所在cell的偏移y坐标，一般可设0
				dx2 - the x coordinate within the second cell.//定义了图片在第二个cell的偏移x坐标，既右下角所在cell的偏移x坐标，一般可设0
				dy2 - the y coordinate within the second cell.//定义了图片在第二个cell的偏移y坐标，既右下角所在cell的偏移y坐标，一般可设0
				col1 - the column (0 based) of the first cell.//第一个cell所在列，既图片左上角所在列
				row1 - the row (0 based) of the first cell.//图片左上角所在行
				col2 - the column (0 based) of the second cell.//图片右下角所在列
				row2 - the row (0 based) of the second cell.//图片右下角所在行
             */
            HSSFClientAnchor anchor = new HSSFClientAnchor(-100, 0, 0, 0,(short) 2, 2, (short) 5, 8);   
            //插入图片  
            patriarch.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG)); 
            fileOut = new FileOutputStream("e:/excel.xls");   
            // 输出文件 
             wb.write(fileOut);   
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}