Avoid comment style for URLs in code listings

Question

I using the following settings for code listings.

\usepackage{listings}
\usepackage{textcomp}
\lstset{language=Java,
    keywordstyle=\color{RoyalBlue},
    basicstyle=\scriptsize\ttfamily,
    commentstyle=\color{Green}\ttfamily,
    rulecolor=\color{black},
    upquote=true,
    numbers=left,
    numberstyle=\tiny\color{gray},
    stepnumber=1,
    numbersep=8pt,
    showstringspaces=false,
    breaklines=true,
    frameround=ftff,
    frame=single,
    belowskip=3em,
    belowcaptionskip=.25\baselineskip
}

The actual code listing contains comments as well as URLs. How can I ensure that only the comment will be colored with commentstyle but not the URL that contains a double slash // as well?

// This is a comment.
http://tex.stackexchange.com

In the example tex.stackexchange.com would be colored Green.

Answer 1

You can use

morecomment=[l][basicstyle]{http://},

which gives

\documentclass{article}
\usepackage{xcolor}
\usepackage{listings}
\usepackage{textcomp}
\lstset{language=Java,
    keywordstyle=\color{RoyalBlue},
    basicstyle=\scriptsize\ttfamily,
    commentstyle=\color{green}\ttfamily,
    rulecolor=\color{black},
    upquote=true,
    numbers=left,
    numberstyle=\tiny\color{gray},
    stepnumber=1,
    numbersep=8pt,
    showstringspaces=false,
    breaklines=true,
    frameround=ftff,
    frame=single,
    belowskip=3em,
    belowcaptionskip=.25\baselineskip,
    morecomment=[l][basicstyle]{http://}, %<---- NEW BIT!
}


\begin{document}

\begin{lstlisting}
// This is a comment.
http://tex.stackexchange.com
hello world
// another comment http://tex.stackexchange.com
\end{lstlisting}

\end{document}