java poi 在excel中插入圖片

java web中導出excel數據是常見的功能，最近遇到一個需求是在excel中插入圖片。處理excel及其餘微軟辦公系列軟件經常使用的就是apache poi，它也是支持圖片插入的。插入圖片最主要的用到HSSFClientAnchor，文檔介紹以下：
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!

簡單的demo：

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();
          //加載圖片
            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.//定義了圖片在第一個cell內的偏移x座標，既左上角所在cell的偏移x座標，通常可設0
                dy1 - the y coordinate within the first cell.//定義了圖片在第一個cell的偏移y座標，既左上角所在cell的偏移y座標，通常可設0
                dx2 - the x coordinate within the second cell.//定義了圖片在第二個cell的偏移x座標，既右下角所在cell的偏移x座標，通常可設0
                dy2 - the y coordinate within the second cell.//定義了圖片在第二個cell的偏移y座標，既右下角所在cell的偏移y座標，通常可設0
                col1 - the column (0 based) of the first cell.//第一個cell所在列，既圖片左上角所在列
                row1 - the row (0 based) of the first cell.//圖片左上角所在行
                col2 - the column (0 based) of the second cell.//圖片右下角所在列
                row2 - the row (0 based) of the second cell.//圖片右下角所在行
             */
            HSSFClientAnchor anchor = new HSSFClientAnchor(-100, 0, 0, 0,(short) 2, 2, (short) 5, 8);   
            //插入圖片  
            patriarch.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG)); 
            fileOut = new FileOutputStream("e:/excel.xls");   
            // 輸出文件 
             wb.write(fileOut);   
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

關於dx1的設置的說明，dx2，dy1等都是相似的

關於一個excel設置多張圖片的demo

package com.poi;

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();
          //加載圖片
            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();   
            HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 0,(short) 2, 2, (short) 5, 8);
            //插入圖片 1 
            patriarch.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
            
            //圖片2
            anchor = new HSSFClientAnchor(200, 0, 0, 0,(short) 2, 9, (short) 5, 15);
            patriarch.createPicture(anchor, wb.addPicture(byteArrayOut.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
            fileOut = new FileOutputStream("e:/excel.xls");   
            // 輸出文件 
             wb.write(fileOut);   
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

整體來講使用poi仍是很方便的。