您可使用<代码>HtmlUnit和Jsoup。 页: 1 然后,通过<代码>HtmlUnit,获得计算风格。 Jsoup刚刚来到这里,准备了html的产出。
你们可以在此找到一个简单的执行情况:
public final class CssInliner {
private static final Logger log = Logger.getLogger(CssInliner.class);
private CssInliner() {
}
public static CssInliner make() {
return new CssInliner();
}
/**
* Main method
*
* @param html html to inline
*
* @return inlined html
*/
public String inline(String html) throws IOException {
try (WebClient webClient = new WebClient()) {
HtmlPage htmlPage = getHtmlPage(webClient, html);
Window window = webClient.getCurrentWindow().getScriptableObject();
for (HtmlElement htmlElement : htmlPage.getHtmlElementDescendants()) {
applyComputedStyle(window, htmlElement);
}
return outputCleanHtml(htmlPage);
}
}
/**
* Output the HtmlUnit page to a clean html. Remove the old global style tag
* that we do not need anymore. This in order to simplify of the tests of the
* output.
*
* @param htmlPage
*
* @return
*/
private String outputCleanHtml(HtmlPage htmlPage) {
Document doc = Jsoup.parse(htmlPage.getDocumentElement().asXml());
Element globalStyleTag = doc.selectFirst("html style");
if (globalStyleTag != null) {
globalStyleTag.remove();
}
doc.outputSettings().syntax(Syntax.html);
return doc.html();
}
/**
* Modify the html elements by adding an style attribute to each element
*
* @param window
* @param htmlElement
*/
private void applyComputedStyle(Window window, HtmlElement htmlElement) {
HTMLElement pj = htmlElement.getScriptableObject();
ComputedCSSStyleDeclaration cssStyleDeclaration = window.getComputedStyle(pj, null);
Map<String, StyleElement> map = getStringStyleElementMap(cssStyleDeclaration);
// apply style element to html
if (!map.isEmpty()) {
htmlElement.writeStyleToElement(map);
}
}
private Map<String, StyleElement> getStringStyleElementMap(ComputedCSSStyleDeclaration cssStyleDeclaration) {
Map<String, StyleElement> map = new HashMap<>();
for (Definition definition : Definition.values()) {
String style = cssStyleDeclaration.getStyleAttribute(definition, false);
if (StringUtils.isNotBlank(style)) {
map.put(definition.getAttributeName(),
new StyleElement(definition.getAttributeName(),
style,
"",
SelectorSpecificity.DEFAULT_STYLE_ATTRIBUTE));
}
}
return map;
}
private HtmlPage getHtmlPage(WebClient webClient, String html) throws IOException {
URL url = new URL("http://tinubuinliner/" + Math.random());
StringWebResponse stringWebResponse = new StringWebResponse(html, url);
return HTMLParser.parseHtml(stringWebResponse, webClient.getCurrentWindow());
}
}
