怎么将PDF转换为HTML？方法浅析

import java.io.IOException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.text.PDFTextStripper;
public class PDFtoHTML {
    public static void main(String[] args) throws IOException {
        PDDocument document = null;
        try {
            document = PDDocument.load(file);
            PDFTextStripper stripper = new PDFTextStripper();
            String text = stripper.getText(document);
            System.out.println(text);
        } finally {
            if (document != null) {
                document.close();
            }
        }
    }
}

import java.io.File;
import java.io.FileOutputStream;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.parser.PdfTextExtractor;
public class PDFtoHTML 
{
    public static void main( String[] args )
    {
        try {
            String inputurl="pdf/demo.pdf";
            String outputurl="html/demo.html";
            File file=new File(outputurl);
            if(!file.exists()){
                file.createNewFile();
            }
            PdfReader reader=new PdfReader(inputurl);
            int totalpages=reader.getNumberOfPages();
            StringBuffer buffer=new StringBuffer();
            for(int i=1;i<=totalpages;i++){
                buffer.append(PdfTextExtractor.getTextFromPage(reader,i));
            }
            FileOutputStream fos=new FileOutputStream(outputurl);
            fos.write(buffer.toString().getBytes());
            fos.flush();
            fos.close();
            reader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import javax.xml.transform.Result;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.sax.SAXResult;
import javax.xml.transform.stream.StreamSource;
import org.apache.fop.apps.FOUserAgent;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.FopFactory;
import org.apache.fop.apps.MimeConstants;
 
public class PDFtoHTML {
    public static void main(String[] args) throws Exception {
        File xsltFile = new File("myXslt.xslt");
        File xmlFile = new File("myXml.xml");
        File htmlFile = new File("myHtml.html");
        FopFactory fopFactory = FopFactory.newInstance();
        FOUserAgent foUserAgent = fopFactory.newFOUserAgent();
        OutputStream out = new FileOutputStream(htmlFile);
        try {
            Fop fop = fopFactory.newFop(MimeConstants.MIME_HTML, foUserAgent, out);
            TransformerFactory factory = TransformerFactory.newInstance();
            Transformer transformer = factory.newTransformer(new StreamSource(xsltFile));
            Result res = new SAXResult(fop.getDefaultHandler());
            transformer.transform(new StreamSource(xmlFile), res);
        } finally {
            out.close();
        }
    }
}