[英]html attributes cleaning with java
我有一个学校的任务,要从html标记中删除所有内容,除了一些属性,如类,id,alt,src,name和href。
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>
我尝试过这样的事情:
String opr = html.replaceAll("<([a-zA-Z]+)[^<>]*(class|id)(=\".+?\")[^<]*(class|id)(=\".+?\")[^<]*>", "<$1 $2$3 $4$5 >");
但它仅适用于同时具有属性class和id的HTML标签。 有人可以帮忙吗?
避免使用正则表达式来满足这种需求,因为如果您想正确使用正则表达式会非常复杂,因此很难维护。 您应该改为使用HTML parser
如Jsoup),然后通过删除所有不需要的属性来清理每个元素,如下所示:
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);
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>
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