html to xhtml conversion in java

I just did it using Jsoup, if it works for you:

private String htmlToXhtml(final String html) {
    final Document document = Jsoup.parse(html);
    document.outputSettings().syntax(Document.OutputSettings.Syntax.xml);
    return document.html();
}

Some useful content where my solution came from:

• Is it possible to convert HTML into XHTML with Jsoup 1.8.1?
• http://developers.itextpdf.com/question/how-do-html-xml-conversion-generate-closed-tags

Have a look at J-Tidy: http://jtidy.sourceforge.net/ It usually does a quite good job cleaning up messy html and converting it to xhtml.

You can use the following method to get xhtml from html

public static String getXHTMLFromHTML(String inputFile,
            String outputFile) throws Exception {

        File file = new File(inputFile);
        FileOutputStream fos = null;
        InputStream is = null;
        try {
            fos = new FileOutputStream(outputFile);
            is = new FileInputStream(file);
            Tidy tidy = new Tidy(); 
            tidy.setXHTML(true); 
            tidy.parse(is, fos);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }finally{
            if(fos != null){
                try {
                    fos.close();
                } catch (IOException e) {
                    fos = null;
                }
                fos = null;
            }
            if(is != null){
                try {
                    is.close();
                } catch (IOException e) {
                    is = null;
                }
                is = null;
            }
        }

        return outputFile;
    }