java通过Freemark生成html，将html生成图片

package com.king.stock.test;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.StringWriter;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.Map;
import freemarker.template.Configuration;
import freemarker.template.Template;
public class HtmlGenerateImages {

    public static void main(String[] args) throws Exception {
        // 1. 生成 HTML 内容
        String html = generateHtml();

        // 2. 渲染 HTML 为图片
        byte[] imageBytes = renderHtmlToImage(html);
        System.out.println("imageBytes"+imageBytes);
        // 3. 将二进制数据写入 TXT 文件
        Files.write(Paths.get("output.txt"), imageBytes);
        System.out.println("图片数据已保存到 output.txt");
    }

    private static String generateHtml() throws Exception {
        Configuration cfg = new Configuration(Configuration.VERSION_2_3_31);
        cfg.setClassForTemplateLoading(HtmlGenerateImages.class, "/templates");
        Template template = cfg.getTemplate("example.ftl");

        Map<String, Object> data = new HashMap<>();
        data.put("name", "World");
        data.put("time", LocalDateTime.now().format(DateTimeFormatter.ofPattern("HH:mm:ss")));

        StringWriter writer = new StringWriter();
        template.process(data, writer);
        return writer.toString();
    }

    private static byte[] renderHtmlToImage(String html) {
        JEditorPane pane = new JEditorPane();
        pane.setContentType("text/html");
        pane.setText(html);
        pane.setSize(500, 300);  // 设置默认大小

        // 渲染为图片
        BufferedImage image = new BufferedImage(
                pane.getWidth(),
                pane.getHeight(),
                BufferedImage.TYPE_INT_RGB
        );
        Graphics2D g = image.createGraphics();
        pane.paint(g);
        g.dispose();

        // 转为字节数组
        try (ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
            javax.imageio.ImageIO.write(image, "png", baos);
            return baos.toByteArray();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}