build.gradle

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implementation 'com.vladsch.flexmark:flexmark-all:0.64.8'

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CommonUtil

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package lh.h.config;

import com.vladsch.flexmark.html.HtmlRenderer;
import com.vladsch.flexmark.parser.Parser;
import com.vladsch.flexmark.util.ast.Node;
import org.springframework.stereotype.Component;

@Component
public class CommonUtil {
		//Markdwon을 분석
    private final Parser parser = Parser.builder().build();
    //Markdown을 HTML로 변환
    private final HtmlRenderer renderer = HtmlRenderer.builder().build();

    public String markdown(String markdown) {
		    //Markdown을 AST로 변환
        Node document = parser.parse(markdown);
        //AST를 HTML로 변환
        String html = renderer.render(document);

        // 코드 블록을 <pre> 없이 <code>로 변환
        html = html.replace("<pre><code>", "<code>").replace("</code></pre>", "</code>");

        return html;
    }
}

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html

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<div class="markdown-body" data-theme="light" th:utext="${@commonUtil.markdown(board.content)}">

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css

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https://github.com/sindresorhus/github-markdown-css

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