java如何将excel文件转图片

Java可以使用Apache POI和Apache Batik库来将Excel文件转换为图片：

1. 导入POI和Batik库

import org.apache.batik.dom.svg.SAXSVGDocumentFactory;
import org.apache.batik.dom.util.DOMUtilities;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.transcoder.TranscoderInput;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.ImageTranscoder;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;

2. 读取Excel文件

File file = new File("path/to/excel/file.xlsx");
Workbook workbook = new XSSFWorkbook(new FileInputStream(file));
Sheet sheet = workbook.getSheetAt(0);

3. 将Excel文件转换为SVG格式

ByteArrayOutputStream out = new ByteArrayOutputStream();
workbook.write(out);
Document document = DOMUtilities.loadXML(new ByteArrayInputStream(out.toByteArray()));
SAXSVGDocumentFactory factory = new SAXSVGDocumentFactory(null);
String uri = file.toURI().toString();
Document svgDocument = factory.createDocument(uri, new ByteArrayInputStream(out.toByteArray()));

4. 将SVG格式转换为BufferedImage

ImageTranscoder transcoder = new ImageTranscoder() {
    @Override
    public BufferedImage createImage(int width, int height) {
        return new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
    }

    @Override
    public void writeImage(BufferedImage image, TranscoderOutput output) throws TranscoderException {
        try {
            ImageIO.write(image, "png", new FileOutputStream("path/to/output/image.png"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
};
transcoder.transcode(new TranscoderInput(svgDocument), null);

最后，你就可以在指定的路径下找到转换后的图片了。