java将html带图片转为.docx、 .pdf、 .image并写入浏览器的工具类

下面是一个将带图片的HTML转为PDF的示例代码，同时也支持转为.docx和image格式，您可以参考下面的代码进行实现：

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.converter.WordToHtmlConverter;
import org.apache.poi.hwpf.usermodel.Range;
import org.apache.poi.xwpf.usermodel.XWPFDocument;
import org.apache.poi.xwpf.usermodel.XWPFParagraph;
import org.apache.poi.xwpf.usermodel.XWPFRun;
import org.openxmlformats.schemas.wordprocessingml.x2006.main.STUnderline;

import com.aspose.words.Document;
import com.aspose.words.HtmlSaveOptions;
import com.aspose.words.ImageSaveOptions;
import com.aspose.words.SaveFormat;
import com.aspose.words.Shape;
import com.aspose.words.Underline;
import com.aspose.words.net.System.Data.DataTable;
import com.lowagie.text.Element;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfTemplate;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.pdf.codec.PngImage;

public class HtmlToDocxPdfImageUtil {

    /**
     * 将带图片的html转为docx格式
     *
     * @param html 带图片的html
     * @param path 转换后的docx文件路径
     * @throws Exception
     */
    public static void htmlToDocx(String html, String path) throws Exception {
        XWPFDocument doc = new XWPFDocument();
        XWPFParagraph p = doc.createParagraph();
        XWPFRun r = p.createRun();
        r.setText(html);
        r.addBreak();
        r.addBreak();
        OutputStream out = new FileOutputStream(new File(path));
        doc.write(out);
        out.close();
    }

    /**
     * 将带图片的html转为pdf格式
     *
     * @param html 带图片的html
     * @param path 转换后的pdf文件路径
     * @throws Exception
     */
    public static void htmlToPdf(String html, String path) throws Exception {
        Document document = new Document(PageSize.A4);
        PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(path));
        document.open();
        Image image;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        HtmlSaveOptions options = new HtmlSaveOptions();
        options.setExportImagesAsBase64(true);
        Document doc = new Document();
        doc.setHtmlImportingMode(HtmlImportingMode.IMPORT_CONTENT);
        doc.setWarningCallback(new HandleDocumentWarnings());
        doc.getLayoutOptions().setUseRecentFonts(true);
        doc.save(baos, options);
        doc = new Document();
        doc.setWarningCallback(new HandleDocumentWarnings());
        doc.getLayoutOptions().setUseRecentFonts(true);
        doc.getPages().add(doc.getFactory().newPage(PageSize.A4));
        ImageSaveOptions iso = new ImageSaveOptions(SaveFormat.PNG);
        iso.setPrettyFormat(true);
        iso.setUseAntiAliasing(true);
        iso.setResolution(200);
        iso.setPageIndex(0);
        iso.setPageCount(1);
        for (int i = 0; i < doc.getSections().getCount(); i++) {
            for (int j = 0; j < doc.getSections().get(i).getBody().getChildNodes().getCount(); j++) {
                com.aspose.words.Node node = doc.getSections().get(i).getBody().getChildNodes().get(j);
                if (node.getNodeType() == com.aspose.words.NodeType.SHAPE) {
                    Shape shape = (Shape) node;
                    BufferedImage bufferedImage = shape.getImageData().toImage();
                    ImageIO.write(bufferedImage, "png", baos);
                    image = Image.getInstance(baos.toByteArray());
                    image.setAbsolutePosition(0, 0);
                    image.scaleAbsolute(PageSize.A4.getWidth(), PageSize.A4.getHeight());
                    document.add(image);
                    baos.reset();
                }
            }
        }
        document.close();
    }

    /**
     * 将带图片的html转为png图片格式
     *
     * @param html 带图片的html
     * @param path 转换后的png文件路径
     * @throws Exception
     */
    public static void htmlToImage(String html, String path) throws Exception {
        URL url = new URL(html);
        BufferedImage image = ImageIO.read(url);
        ImageIO.write(image, "png", new File(path));
    }

    /**
     * 处理Aspose转换Word过程中的警告信息
     */
    private static class HandleDocumentWarnings implements IWarningCallback {
        public void warning(WarningInfo info) {
            System.out.println("Warning " + info.getWarningType() + " occurred: " + info.getDescription());
        }
    }

}

上面的代码使用了多个第三方库，包括：

- Aspose.Words：用于将HTML转为.docx格式；
- iText：用于将HTML转为PDF格式；
- Apache POI：用于将HTML转为.docx格式；
- javax.imageio：用于将HTML转为PNG格式。

您需要将这些库添加到您的项目中，并根据需要进行配置。