【Java】Markdown文档转为其他格式

需要 pom.xml 中添加以下依赖

<dependencies>
        <dependency>
            <groupId>com.atlassian.commonmark</groupId>
            <artifactId>commonmark</artifactId>
            <version>0.8.0</version>
        </dependency>
        <dependency>
            <groupId>com.atlassian.commonmark</groupId>
            <artifactId>commonmark-ext-gfm-tables</artifactId>
            <version>0.8.0</version>
        </dependency>
        <dependency>
            <groupId>org.logback-extensions</groupId>
            <artifactId>logback-ext-spring</artifactId>
            <version>0.1.5</version>
        </dependency>
        <dependency>
            <groupId>org.commonmark</groupId>
            <artifactId>commonmark-ext-heading-anchor</artifactId>
            <version>0.21.0</version>
        </dependency>

    </dependencies>

写一个名为 MarkdownUtils 的工具类

import org.commonmark.Extension;
import org.commonmark.ext.gfm.tables.TableBlock;
import org.commonmark.ext.gfm.tables.TablesExtension;
import org.commonmark.ext.heading.anchor.HeadingAnchorExtension;
import org.commonmark.node.Link;
import org.commonmark.node.Node;
import org.commonmark.parser.Parser;
import org.commonmark.renderer.html.AttributeProvider;
import org.commonmark.renderer.html.HtmlRenderer;

import java.util.*;


public class MarkdownUtils {

    /**
     * markdown格式转换成HTML格式
     *
     * @param markdown
     * @return
     */
    public static String markdownToHtml(String markdown) {
        Parser parser = Parser.builder().build();
        Node document = parser.parse(markdown);
        HtmlRenderer renderer = HtmlRenderer.builder().build();
        return renderer.render(document);
    }

    /**
     * 增加扩展[标题锚点，表格生成]
     * Markdown转换成HTML
     *
     * @param markdown
     * @return
     */
    public static String markdownToHtmlExtensions(String markdown) {
        //h标题生成id
        Set<Extension> headingAnchorExtensions = Collections.singleton(HeadingAnchorExtension.create());
        //转换table的HTML
        List<Extension> tableExtension = Arrays.asList(TablesExtension.create());
        Parser parser = Parser.builder()
                .extensions(tableExtension)
                .build();
        Node document = parser.parse(markdown);
        HtmlRenderer renderer = HtmlRenderer.builder()
                .extensions(headingAnchorExtensions)
                .extensions(tableExtension)
                .attributeProviderFactory(context -> new CustomAttributeProvider())
                .build();
        return renderer.render(document);
    }

    /**
     * 处理标签的属性
     */
    static class CustomAttributeProvider implements AttributeProvider {
        @Override
        public void setAttributes(Node node, String tagName, Map<String, String> attributes) {
            //改变a标签的target属性为_blank
            if (node instanceof Link) {
                attributes.put("target", "_blank");
            }
            if (node instanceof TableBlock) {
                attributes.put("class", "ui celled table");
            }
        }
    }


}

测试

import com.zhangxuetu.learn.util.MarkdownUtils;

public class MdUtilTest {

    public static void main(String[] args) {
        String table = "| hello | hi   | 哈哈哈   |\n" +
                "| ----- | ---- | ----- |\n" +
                "| 斯维尔多  | 士大夫  | f啊    |\n" +
                "| 阿什顿发  | 非固定杆 | 撒阿什顿发 |\n";
        String a = "[ONESTAR](https://onestar.newstar.net.cn/)";
        System.out.println(MarkdownUtils.markdownToHtmlExtensions(a));

        String html = MarkdownUtils.markdownToHtmlExtensions(table);
        System.out.println(html);

    }

}