Question

我有一个学校的任务，除了一些属性，如class，id，alt，src，name和href，从html标签中删除所有内容。

例如，我们有一个HTML文件：

<div class="wrapper">
<h1 value="something" class=header>Header</h1>
<div id="article1" class="article" name="something" >
<img clsas="mistake" src="picture.jpg" id="pict1" class="image_article" alt="picture" />
<p class="article_text" >Lorem ipsum dolor sit amet, consectetur adipiscing. </p>
<a href="article.html" title="More">Více</a>
</div>

结果应该是这样的：

<div class="wrapper">
<h1 class=header>Header</h1>
<div id="article1" class="article" >
<img src="picture.jpg" id="pict1" class="image_article" alt="picture" />
<p class="article_text" >Lorem ipsum dolor sit amet, consectetur adipiscing. </p>
<a href="article.html">Více</a>
</div>

我试过这样的事情：

String opr = html.replaceAll("<([a-zA-Z]+)[^<>]*(class|id)(=\".+?\")[^<]*(class|id)(=\".+?\")[^<]*>", "<$1 $2$3 $4$5 >");

但它仅适用于属性类和id的HTML标记。有人可以帮忙吗？

Answer 1

避免使用正则表达式来满足这种需求，因为如果你想要正确使用它会非常复杂，因此很难维护。您应该使用HTML parser而不是Jsoup，然后通过删除下一个所有不需要的属性来清理每个元素：

Document doc = Jsoup.parse("<html>\n" +
    " <head></head>\n" +
    " <body>\n" +
    "<table><div class=\"wrapper\">\n" +
    "<h1 value=\"something\" class=header>Header</h1>\n" +
    "<div id=\"article1\" class=\"article\" name=\"something\" >\n" +
    "<img clsas=\"mistake\" src=\"picture.jpg\" id=\"pict1\" class=\"image_article\" alt=\"picture\" />\n" +
    "<p class=\"article_text\" >Lorem ipsum dolor sit amet, consectetur adipiscing. </p>\n" +
    "<a href=\"article.html\" title=\"More\">Více</a>\n" +
    "</div></body></html>"
);
for (Element element : doc.getAllElements()) {
    for (Attribute attribute : element.attributes()) {
        switch (attribute.getKey()) {
            case "class":
            case "id":
            case "alt":
            case "src":
            case "name":
            case "href":
                break;
            default:
                element.removeAttr(attribute.getKey());
        }
    }
}
System.out.println(doc);

<强>输出：

<html>
 <head></head> 
 <body> 
  <div class="wrapper"> 
   <h1 class="header">Header</h1> 
   <div id="article1" class="article" name="something"> 
    <img src="picture.jpg" id="pict1" class="image_article" alt="picture"> 
    <p class="article_text">Lorem ipsum dolor sit amet, consectetur adipiscing. </p> 
    <a href="article.html">Více</a> 
   </div>
  </div>
  <table></table>
 </body>
</html>

用java清理html属性

1 个答案: