java excel转图片

你可以使用Java的POI库来读取Excel文件，并使用Java的Apache Batik库将Excel表格转换为SVG格式，然后使用Java的Apache FOP库将SVG文件转换为图片。

以下是一个简单的Java代码示例，用于将Excel表格转换为PNG格式的图片：

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;

import javax.imageio.ImageIO;

import org.apache.batik.dom.svg.SAXSVGDocumentFactory;
import org.apache.batik.util.XMLResourceDescriptor;
import org.apache.commons.io.IOUtils;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
import org.apache.fop.apps.MimeConstants;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

public class ExcelToImageConverter {

    public static void main(String[] args) throws Exception {
        // Load the Excel file
        Workbook workbook = WorkbookFactory.create(new File("input.xlsx"));
        
        // Convert Excel to SVG
        ByteArrayOutputStream svgStream = new ByteArrayOutputStream();
        workbook.write(svgStream);
        String svgXml = svgStream.toString();
        saxSvgDocumentFactory = new SAXSVGDocumentFactory(XMLResourceDescriptor.getXMLParserClassName());
        SVGDocument svgDocument = saxSvgDocumentFactory.createSVGDocument(null, new ByteArrayInputStream(svgXml.getBytes()));
        
        // Convert SVG to PNG
        BufferedImage bufferedImage = createBufferedImage(svgDocument);
        OutputStream outputStream = new FileOutputStream(new File("output.png"));
        ImageIO.write(bufferedImage, "png", outputStream);
        IOUtils.closeQuietly(outputStream);
    }

    private static BufferedImage createBufferedImage(SVGDocument svgDocument) throws Exception {
        BufferedImage bufferedImage = null;
        try {
            // Create PNG transcoder
            PNGTranscoder transcoder = new PNGTranscoder();

            // Set transcoder input
            TranscoderInput transcoderInput = new TranscoderInput(svgDocument);

            // Set transcoder output
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            TranscoderOutput transcoderOutput = new TranscoderOutput(outputStream);

            // Transcode SVG to PNG
            transcoder.transcode(transcoderInput, transcoderOutput);
            byte[] pngBytes = outputStream.toByteArray();

            // Create BufferedImage from PNG bytes
            bufferedImage = ImageIO.read(new ByteArrayInputStream(pngBytes));
        } catch (Exception e) {
            throw e;
        }
        return bufferedImage;
    }

}

请注意，此示例假定你已经在项目中添加了所需的POI、Batik和FOP库。