java execl 转png

要将Java Excel转换为PNG，你可以使用Apache POI和Apache Batik这两个开源Java库。以下是一个基本的代码示例，可以将Excel文件的第一个工作表转换为PNG格式的图片：

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;

import javax.imageio.ImageIO;

import org.apache.batik.dom.svg.SVGDOMImplementation;
import org.apache.batik.svggen.SVGGraphics2D;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Workbook;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.svg.SVGDocument;

public class ExcelToPngConverter {

    public static void main(String[] args) throws Exception {
        InputStream input = new FileInputStream("ExcelFile.xls");
        Workbook workbook = new HSSFWorkbook(input);
        BufferedImage image = workbookToImage(workbook, 0);
        saveImage(image, "PNGFile.png");
    }

    private static BufferedImage workbookToImage(Workbook workbook, int sheetIndex) {
        BufferedImage image = null;
        try {
            DOMImplementation domImpl = SVGDOMImplementation.getDOMImplementation();
            String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
            SVGDocument document = (SVGDocument) domImpl.createDocument(svgNS, "svg", null);
            SVGGraphics2D svgGenerator = new SVGGraphics2D(document);
            workbook.getSheetAt(sheetIndex).setPrintGridlines(false);
            workbook.getSheetAt(sheetIndex).setPrintRowAndColumnHeadings(false);
            svgGenerator.setSVGCanvasSize(workbook.getSheetAt(sheetIndex).getRow(0).getHeightInPoints() * workbook.getSheetAt(sheetIndex).getLastRowNum(), workbook.getSheetAt(sheetIndex).getColumnWidthInPixels(0) * workbook.getSheetAt(sheetIndex).getRow(0).getLastCellNum());
            workbook.getSheetAt(sheetIndex).draw(svgGenerator, null, null, 0, 0);
            image = new BufferedImage(svgGenerator.getSVGCanvasSize().width, svgGenerator.getSVGCanvasSize().height, BufferedImage.TYPE_INT_ARGB);
            svgGenerator.paint(image.createGraphics());
            svgGenerator.dispose();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return image;
    }

    private static void saveImage(BufferedImage image, String fileName) {
        try {
            ImageIO.write(image, "png", new FileOutputStream(new File(fileName)));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

请注意，这个示例代码只是提供了一个基本的框架，你需要根据你的具体需求进行修改和优化。此外，你需要在项目中引入Apache POI和Apache Batik的依赖关系。