Generate PDF with iText

MakePDF.java

package net.ekstrandom.htmlpdf;

import java.util.Optional;
import java.io.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import picocli.CommandLine;
// import com.itextpdf.kernel.io.*;
import com.itextpdf.kernel.pdf.*;
import com.itextpdf.html2pdf.*;
import com.itextpdf.styledxmlparser.css.media.*;

class PDFOptions {
    @CommandLine.Option(names="-o", description="write output to file")
    File outputFile;

    @CommandLine.Option(names="-help", description="show this help")
    boolean help;

    @CommandLine.Option(names="-password", description="encrypt with password")
    String password;

    @CommandLine.Parameters(paramLabel="PATH", arity="0..1",
                            description="render page at PATH")
    Optional<String> path;
}

public class MakePDF {
    private static final Logger log = LoggerFactory.getLogger(MakePDF.class);
    
    public static void main(String[] args) throws Exception {
        PDFOptions opts = new PDFOptions();
        CommandLine cli = new CommandLine(opts);
        cli.parseArgs(args);

        if (opts.help) {
            cli.usage(System.err);
            System.exit(0);
        }

        if (!opts.path.isPresent()) {
            log.error("no path provided");
            System.exit(1);
        }

        log.info("input base URL: {}", opts.path);
        InputStream source = new FileInputStream(opts.path.get());

        OutputStream dest;
        if (opts.outputFile != null) {
            log.info("writing to {}", opts.outputFile);
            dest = new FileOutputStream(opts.outputFile);
        } else {
            log.info("writing to standard output");
            dest = System.out;
        }

        PdfWriter out;
        if (opts.password == null) {
            out = new PdfWriter(dest);
        } else {
            WriterProperties props = new WriterProperties();
            props = props.setStandardEncryption(
                opts.password.getBytes(), opts.password.getBytes(),
                EncryptionConstants.ALLOW_PRINTING,
                EncryptionConstants.ENCRYPTION_AES_128 | EncryptionConstants.DO_NOT_ENCRYPT_METADATA);
            out = new PdfWriter(dest, props);
        }

        ConverterProperties cvt = new ConverterProperties();
        cvt.setBaseUri(opts.path.get());
        cvt.setMediaDeviceDescription(new MediaDeviceDescription(MediaType.PRINT));
        HtmlConverter.convertToPdf(source, out, cvt);
        log.info("Finished!");
    }
}