为什么 org.w3c.dom 解析我的 xml 错误？

Question

解析后xml,

<html>
    <body>
        <a>
            <div>
                <span>foo</span>
            </div>
        </a>
    </body>
</html>

用 javax.xml.xpath 解析的 org.w3c.dom 文档表示如下：

div是a
a是span

为什么会这样，我该如何正确解析这个xml？

这是我正在使用的代码，然后是用于创建 Document 对象的方法，然后是代码的输出。

String myxml = ""
    + "<html>"
    + "<body>"
    + "<a>"
    + "<div>"
    + "<span>foo</span>"
    + "</div>"
    + "</a>"
    + "</body>"
    + "</html>";

Document doc = HttpDownloadUtilities.getWebpageDocument_fromSource(myxml);

XPath xPath = XPathFactory.newInstance().newXPath();

Node node = ((Node)xPath.compile("//*[text() = 'foo']").evaluate(doc, XPathConstants.NODE));

System.out.println("       node tag: " + node.getNodeName());
System.out.println("     parent tag: " + node.getParentNode().getNodeName());
System.out.println("grandparent tag: " + node.getParentNode().getParentNode().getNodeName());

Set<Node> nodes = H.getSet((NodeList)xPath.compile("//*").evaluate(doc, XPathConstants.NODESET));

for (Node n : nodes) {
    System.out.println();
    try {
        System.out.println("node: " + n.getNodeName());
    } catch (Exception e) {
    }
    try {
        System.out.println("child: " + n.getChildNodes().item(0).getNodeName());
    } catch (Exception e) {
    }
}

这里是创建文档对象的方法：

public static Document getWebpageDocument_fromSource(String source) throws InterruptedException, IOException {
    try {
        HtmlCleaner cleaner = new HtmlCleaner();
        CleanerProperties props = cleaner.getProperties();
        props.setAllowHtmlInsideAttributes(true);
        props.setAllowMultiWordAttributes(true);
        props.setRecognizeUnicodeChars(true);
        props.setOmitComments(true);

        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder = null;
        try {
            builder = builderFactory.newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        }

        TagNode tagNode = new HtmlCleaner().clean(source);

        Document doc = new DomSerializer(new CleanerProperties()).createDOM(tagNode);

        return doc;
    } catch (ParserConfigurationException ex) {
        ex.printStackTrace();
        return null;
    }
}

输出：

       node tag: span
     parent tag: a
grandparent tag: div

node: html
child: head

node: head

node: body
child: html

node: html
child: body

node: body
child: a

node: a

node: div
child: a

node: a
child: span

node: span
child: #text

Answer 1

很可能 html 解析器修复了无效的 html。不允许使用 a-tags div-tags。只要您拥有文档对象，html 就已经被解析并修复。

为什么 org.w3c.dom 解析我的 xml 错误？

Why is org.w3c.dom parsing my xml wrong?

java

xml

xpath

html-parsing

xml-parsing