使用 tabularx 时缺少表格边框

Question

我正在使用tabularx这个解决方案：https://tex.stackexchange.com/a/12712根据内容大小和换行符在可变列宽中实现右对齐。

我希望结果看起来像这样：

问题是X | X缺少列之间的边框：

\documentclass{article}

\usepackage{tabularx}    %% tables with auto size
\usepackage{array}   %% tables content alignment
\newcolumntype{L}[1]{>{\raggedright\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}
\newcolumntype{C}[1]{>{\centering\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}
\newcolumntype{R}[1]{>{\raggedleft\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}

\begin{document}

  \begin{center}
    \begin{tabularx}{\textwidth}{| X | X | R{2cm} | R{2cm} |}
      \hline
      Column1 & Column2 & Column3 & Column4 \\ \hline
      a & Some Value & This is a very long right-aligned text that should break automatically & This is a very long right-aligned text that should break automatically \\ \hline
      b & Some Value & Shorter right-aligned text & Shorter right-aligned text \\ \hline
    \end{tabularx}
  \end{center}

\end{document}

Answer 1

\multicolumn{1}{c}为了回答评论中提出的关于标题的问题，您可以使用或仅仅使用 覆盖右对齐，\centering因为所有列都是p（或等效地，X）列所以是 parboxes。

\documentclass{article}

\usepackage{tabularx}    %% tables with auto size
\usepackage{array}   %% tables content alignment
\newcolumntype{L}[1]{>{\raggedright\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}
\newcolumntype{C}[1]{>{\centering\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}
\newcolumntype{R}[1]{>{\raggedleft\let\newline\\\arraybackslash\hspace{0pt}}m{#1}}

\begin{document}

  \begin{center}
\setlength\extrarowheight{2pt}
    \begin{tabularx}{\textwidth}{| X | X | R{2cm} | R{2cm} |}
      \hline
\centering\bfseries
      Column1 & 
\centering\bfseries
Column2 &
\centering\bfseries
Column3 &
\centering\bfseries
Column4 \tabularnewline \hline
      a & Some Value & This is a very long right-aligned text that should break automatically & This is a very long right-aligned text that should break automatically \\ \hline
      b & Some Value & Shorter right-aligned text & Shorter right-aligned text \\ \hline
    \end{tabularx}
  \end{center}

\end{document}