Java - Convert HTML to PDF File - Using iText

Here's how you can convert HTML to PDF using iText and Flying Saucer PDF libraries in Java. The steps are described within the code below.

You can easily add some methods below to read HTML content from a file and convert the HTML file to PDF ( instead of HTML string to PDF).

package g.t.test;

import org.xhtmlrenderer.pdf.ITextRenderer;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
public class HtmlToPDFConverter {

    public static void convert(String htmlContent, File pdfFile) throws Exception {
        ByteArrayOutputStream os = new ByteArrayOutputStream();

        //step1: render html to memory         
        ITextRenderer renderer = new ITextRenderer();
        renderer.setDocumentFromString(htmlContent);
        renderer.layout();
        renderer.createPDF(os);

        //step2: conver to byte array stream         
        byte[] pdfAsBytes = os.toByteArray();
        os.close();

        //step3: write byte array stream to file         
        FileOutputStream fos = new FileOutputStream(pdfFile);
        fos.write(pdfAsBytes);
        fos.flush();
        fos.close();
    }

    // let's test !! 
    public static void main(String[] args) throws Exception{
        convert("<html> <body> " +
            "<h1>Hello Crazy World !!</h1> <br/> " +
            "<h2> I hope you are doing great.</h2> " +
            "</body> </html>", new File("test.pdf"));
    }
}

Used Maven Dependencies:

<dependency>
    <groupId>com.lowagie</groupId>
    <artifactId>itext</artifactId>
    <version>2.1.7</version>
</dependency>
<dependency>
    <groupId>org.xhtmlrenderer</groupId>
    <artifactId>flying-saucer-pdf</artifactId>
    <version>9.0.9</version>
</dependency>