Source code listing with frame around code?

Question

I'd like to make my code listing looking more sexy. I found a good example on SO, but one problem is remaining:

I would like to not only have a horizontal line at the bottom of the listing but also at the left and right side. Therefore I changed frame=b to frame = blr. This works fine, but the problem is now that there is a small gap between the vertical lines and the caption box. How can I correct this? I want a closed box with a caption around my listing.

Answer 1

\documentclass{report}

\usepackage{xcolor}
\usepackage{listings}
\usepackage{caption}
\DeclareCaptionFont{white}{\color{white}}
\DeclareCaptionFormat{listing}{%
  \parbox{\textwidth}{\colorbox{gray}{\parbox{\textwidth}{#1#2#3}}\vskip-4pt}}
\captionsetup[lstlisting]{format=listing,labelfont=white,textfont=white}
\lstset{frame=lrb,xleftmargin=\fboxsep,xrightmargin=-\fboxsep}

\begin{document}
\belowcaptionskip=-10pt
\begin{lstlisting}[label=some-code,caption=Some Code]
public void here() {
    goes().the().code()
}
\end{lstlisting}

\end{document}

Answer 2

Although listings already offers tools for framed listings, I think tcolorbox is far more flexible for this task. In particular, tcolorbox can produce framed boxes for code listings processed/created with listings, listingsutf8 and minted.

Next code shows an example with the OP's desired sexy listing:

\documentclass{report}

\usepackage{listings}
\usepackage[most]{tcolorbox}
\usepackage{inconsolata}

\newtcblisting[auto counter]{sexylisting}[2][]{sharp corners, 
    fonttitle=\bfseries, colframe=gray, listing only, 
    listing options={basicstyle=\ttfamily,language=java}, 
    title=Listing \thetcbcounter: #2, #1}

\begin{document}
\begin{sexylisting}{Some Code}
public void here() {
    goes().the().code()
}
\end{sexylisting}

\begin{sexylisting}[colback=white]{Same code again}
public void here() {
    goes().the().code()
}
\end{sexylisting}
\end{document}