java - Automatically convert Style Sheets to inline style

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java - Automatically convert Style Sheets to inline style

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

Don't have to worry about linked style or hover style.

I want to automatically convert files like this

<html>
<body>
<style>
body{background:#FFC}
p{background:red}
body, p{font-weight:bold}
</style>
<p>...</p>
</body>
</html>

to files like this

<html>
<body style="background:red;font-weight:bold">
<p style="background:#FFC;font-weight:bold">...</p>
</body>
</html>

I would be even more interested if there was an HTML parser that would do this.

The reason I want to do this is so I can display emails that use global style sheets without their style sheets messing up the rest of my web page. I also would like to send the resulting style to web based rich text editor for reply and original message.

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1 Answer

深蓝 · Answer 1 · 2021-10-23T18:28:21+0000

Here is a solution on java, I made it with the JSoup Library: http://jsoup.org/download

import java.io.IOException;
import java.util.StringTokenizer;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class AutomaticCssInliner {
    /**
     * Hecho por Grekz, http://grekz.wordpress.com
     */
    public static void main(String[] args) throws IOException {
        final String style = "style";
        final String html = "<html>" + "<body> <style>"
                + "body{background:#FFC} 
 p{background:red}"
                + "body, p{font-weight:bold} </style>"
                + "<p>...</p> </body> </html>";
        // Document doc = Jsoup.connect("http://mypage.com/inlineme.php").get();
        Document doc = Jsoup.parse(html);
        Elements els = doc.select(style);// to get all the style elements
        for (Element e : els) {
            String styleRules = e.getAllElements().get(0).data().replaceAll(
                    "
", "").trim(), delims = "{}";
            StringTokenizer st = new StringTokenizer(styleRules, delims);
            while (st.countTokens() > 1) {
                String selector = st.nextToken(), properties = st.nextToken();
                Elements selectedElements = doc.select(selector);
                for (Element selElem : selectedElements) {
                    String oldProperties = selElem.attr(style);
                    selElem.attr(style,
                            oldProperties.length() > 0 ? concatenateProperties(
                                    oldProperties, properties) : properties);
                }
            }
            e.remove();
        }
        System.out.println(doc);// now we have the result html without the
        // styles tags, and the inline css in each
        // element
    }

    private static String concatenateProperties(String oldProp, String newProp) {
        oldProp = oldProp.trim();
        if (!newProp.endsWith(";"))
           newProp += ";";
        return newProp + oldProp; // The existing (old) properties should take precedence.
    }
}

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