java - 使用 jsoup 提取没有 img 标签的图像

Question

我需要提取 div 内的图像，并且 src 未在 img 标记内列出。我也无法执行 getElementById() ，因为它因页面而异。在这种情况下，我可以使用一些正则表达式从文档中提取图像吗？任何帮助表示赞赏。

HTML 片段:

<div 
    class="rendition-bg rendition-bg--alignment desktop-center-center mobile-center-center" 
    data-src="/content/dam/Image.jpg.transform/default- 
mobile/image.jpg" 
    data-mobile-rendition="/content/dam/Image.jpg.transform/default-mobile/image.jpg" 
    data-tablet-rendition="/content/dam/Image.jpg.transform/default-mobile/image.jpg" 
    data-desktop- rendition="/content/dam/Image.jpg.transform/default-desktop/image.jpg" 
    style="background-image: url(&quot;/content/dam/Image.jpg.transform/default- 
mobile/image.jpg&quot;);">
</div>

Answer 1

远非优雅或简单的解决方案，但希望以下内容可以给您一些开始:

    String snippet =
      "<div class=\"rendition-bg rendition-bg--alignment desktop-center-center" +
        "mobile-center-center \" data-src=\"/content/dam/Image.jpg.transform/default-" +
        "mobile/image.jpg\" data-mobile- \n" +
        "rendition=\"/content/dam/Image.jpg.transform/default-mobile/image.jpg\" data-" +
        "tablet-rendition=\"/content/dam/Image.jpg.transform/default-mobile/image.jpg\"" +
        "data-desktop- rendition=\"/content/dam/Image.jpg.transform/default-desktop/image.jpg\"" +
        "style=\"background-image: url(&quot;/content/dam/Image.jpg.transform/default-" +
        "mobile/image.jpg&quot;);\"></div>";

    List<String> imgAttrs =
      Jsoup.parse(snippet)
        .getElementsByTag("div")
        .stream()
        // get lists of attributes
        .map(Element::attributes)
        // flatten all attrs to single list
        .flatMap(attrs -> attrs.asList().stream())
        // filter attributes
        .filter(attribute -> attribute.getValue() != null && attribute.getValue().contains(".jpg"))
        // map to values
        .map(Attribute::getValue)
        // replace all ".transform" with a whitespace
        .map(attrValue -> attrValue.replace(".transform", " "))
        // get url value of a "background-image"
        .map(attrValue -> getUrlFromBackgroundImage(attrValue))
        // split attributes by whitespaces
        .flatMap(attrValue -> Stream.of(attrValue.split(" ")))
        .collect(toList());
      }

     private static String getUrlFromBackgroundImage(final String backgroundImage) {
        Pattern pattern = Pattern.compile("background-image:[ ]?url\\((['\"]?(.*?\\.(?:png|jpg|jpeg|gif)(\\s)?)*)");
        Matcher matcher = pattern.matcher(backgroundImage);
        return matcher.find() ? matcher.group(1) : backgroundImage;
     }

imgAttrs 的内容应该是:

/content/dam/Image.jpg
/default-mobile/image.jpg
/content/dam/Image.jpg
/default-desktop/image.jpg
/content/dam/Image.jpg
/default-mobile/image.jpg
"/content/dam/Image.jpg
/default-mobile/image.jpg

不确定这是否是您所需要的。