如何使用Apache POI - Apache POI将Excel单元格转换为图片

使用Apache POI将Excel单元格转换为图片需要以下步骤：

1. 加载Excel文件并创建工作簿对象：

File file = new File("path/to/excel/file.xlsx");
Workbook workbook = WorkbookFactory.create(file);

2. 获取要转换为图片的单元格对象：

Sheet sheet = workbook.getSheetAt(0); // 获取第一个工作表
Row row = sheet.getRow(0); // 获取第一行
Cell cell = row.getCell(0); // 获取第一个单元格

3. 创建绘图对象并设置绘图区域：

Drawing drawing = sheet.createDrawingPatriarch();
ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, cell.getColumnIndex(), row.getRowNum(), cell.getColumnIndex() + 1, row.getRowNum() + 1);

4. 创建图片对象并将其插入绘图对象：

byte[] imageBytes = // 从单元格中获取图片字节数组
int pictureIndex = workbook.addPicture(imageBytes, Workbook.PICTURE_TYPE_JPEG);
Picture picture = drawing.createPicture(anchor, pictureIndex);

5. 将工作簿写入输出流：

FileOutputStream out = new FileOutputStream("path/to/output/image.jpg");
workbook.write(out);
out.close();

完整代码示例：

File file = new File("path/to/excel/file.xlsx");
Workbook workbook = WorkbookFactory.create(file);

Sheet sheet = workbook.getSheetAt(0); // 获取第一个工作表
Row row = sheet.getRow(0); // 获取第一行
Cell cell = row.getCell(0); // 获取第一个单元格

Drawing drawing = sheet.createDrawingPatriarch();
ClientAnchor anchor = drawing.createAnchor(0, 0, 0, 0, cell.getColumnIndex(), row.getRowNum(), cell.getColumnIndex() + 1, row.getRowNum() + 1);

byte[] imageBytes = // 从单元格中获取图片字节数组
int pictureIndex = workbook.addPicture(imageBytes, Workbook.PICTURE_TYPE_JPEG);
Picture picture = drawing.createPicture(anchor, pictureIndex);

FileOutputStream out = new FileOutputStream("path/to/output/image.jpg");
workbook.write(out);
out.close();