java excel转图片

你可以使用 Apache POI 和 Java 2D API 完成这个任务。以下是一个简单的示例，它将 Excel 工作簿中的一个工作表转换为一个图片文件。

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.imageio.ImageIO;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ExcelToImage {
    public static void main(String[] args) throws IOException {
        String excelFilePath = "path/to/excel/file.xlsx";
        String sheetName = "Sheet1";
        String imageFilePath = "path/to/image/file.png";

        // Load Excel workbook
        Workbook workbook = new XSSFWorkbook(excelFilePath);

        // Get the sheet to be converted
        Sheet sheet = workbook.getSheet(sheetName);

        // Convert sheet to image
        BufferedImage image = sheetToImage(sheet);

        // Save image to file
        saveImage(image, imageFilePath);

        // Close workbook
        workbook.close();
    }

    private static BufferedImage sheetToImage(Sheet sheet) {
        // Convert sheet to image
        BufferedImage image = new BufferedImage(sheet.getLastRowNum() * 15, sheet.getRow(0).getLastCellNum() * 120,
                BufferedImage.TYPE_INT_RGB);
        sheet.getWorkbook().setSheetVisibility(sheet.getWorkbook().getSheetIndex(sheet), 0); // hide the sheet
        sheet.getWorkbook().setActiveSheet(sheet.getWorkbook().getSheetIndex(sheet)); // activate the sheet
        sheet.getWorkbook().setPrintArea(sheet.getWorkbook().getSheetIndex(sheet), 0, sheet.getLastRowNum(), 0,
                sheet.getRow(0).getLastCellNum() - 1); // set print area
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setZoom(1, 1); // set zoom
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setFitToPage(true); // fit to page
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setHorizontallyCenter(true); // center horizontally
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setVerticallyCenter(true); // center vertically
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setMargin(org.apache.poi.ss.usermodel.Sheet.LeftMargin, 0.25); // set left margin
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setMargin(org.apache.poi.ss.usermodel.Sheet.RightMargin, 0.25); // set right margin
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setMargin(org.apache.poi.ss.usermodel.Sheet.TopMargin, 0.25); // set top margin
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setMargin(org.apache.poi.ss.usermodel.Sheet.BottomMargin, 0.25); // set bottom margin
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setMargin(org.apache.poi.ss.usermodel.Sheet.HeaderMargin, 0.3); // set header margin
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setMargin(org.apache.poi.ss.usermodel.Sheet.FooterMargin, 0.3); // set footer margin
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setHorizontallyCenter(true);
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setVerticallyCenter(true);
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setForceFormulaRecalculation(true); // force formula recalculation
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setAutobreaks(true); // enable automatic page breaks
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setRepeatingRows(new org.apache.poi.ss.util.CellRangeAddress(0, 1, 0, sheet.getRow(0).getLastCellNum() - 1)); // set repeating rows
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setRepeatingColumns(new org.apache.poi.ss.util.CellRangeAddress(0, sheet.getLastRowNum(), 0, 1)); // set repeating columns
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setPrintGridlines(true); // print gridlines
        sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).setPrintRowAndColumnHeadings(true); // print row and column headings

        Graphics2D graphics = image.createGraphics();
        try {
            sheet.getWorkbook().getSheet(sheet.getWorkbook().getActiveSheetIndex()).draw(graphics);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            graphics.dispose();
        }

        return image;
    }

    private static void saveImage(BufferedImage image, String filePath) throws IOException {
        File file = new File(filePath);
        ImageIO.write(image, "png", new FileOutputStream(file));
    }
}

在此示例中，我们使用 Apache POI 的 XSSFWorkbook 类加载 Excel 工作簿，然后使用 sheetToImage() 方法将工作表转换为 BufferedImage 对象。最后，我们使用 saveImage() 方法将 BufferedImage 对象保存为 PNG 图像文件。

请注意，这只是一个简单的示例。在实际应用中，您可能需要处理更复杂的工作表，并根据需要调整创建的图像的大小和分辨率。