XPath - 如何获取具有相同名称的多个标签的列表

问题描述：

<?xml version="1.0"?>
<shop>
    <shoes>
        <brand>Nike</brand>
        <size>13</size>
        <colour>White</colour>
        <price>34.99</price>
        <additional name="abc">123</additional>
        <additional name="def">456</additional>
        <additional name="ghi">789</additional>
        <additional name="jkl">101</additional>
    </shoes>
    <trousers>
        <brand>Levi</brand>
        <size>36</size>
        <legSize>33</legSize>
        <colour>Stonewash</colour>
        <price>69.99</price>
        <additional name="mno">112</additional>
        <additional name="pqr">131</additional>
        <additional name="stu">415</additional>
        <additional name="vwx">161</additional>
    </trousers>
</shop>

鉴于上述 xml 文件，我将如何检索标签中所有标签的列表?我想获取名称"的所有值以及标签之间的数值.像这样:

Given the above xml file, how would I retrieve a list of all <additional> tags within the <shoes> tag? I want to get all the values of 'name' along with the numeric value between the tags. Something like this:

abc, 123
def, 456
ghi, 789
jkl, 101

问题是我不知道会有多少额外的标签.可能没有，也可能有 20 个.我需要某种方法将它们全部计算出来，然后剔除信息.

The problem is I don't know how many additional tags there will be. There could be none and there could be 20. I need some way to count them all then strip out the information.

答

这是一个使用 JDK 中的 XPath 来执行查询的示例.它假定变量 xml 包含您的 XML 文档.

Here's an example that uses XPath from the JDK to execute a query. It assumes that the variable xml contains your XML document.

XPathFactory factory = XPathFactory.newInstance();
XPath xPath = factory.newXPath();
NodeList nodeList = (NodeList) xPath.evaluate("//shoes/additional", new InputSource(new StringReader(xml)), XPathConstants.NODESET);
for (int i = 0; i < nodeList.getLength(); ++i) {
    String name = nodeList.item(i).getAttributes().getNamedItem("name").getNodeValue();
    String text = nodeList.item(i).getTextContent();
    System.out.println(name + ", " + text);
}

XPath - 如何获取具有相同名称的多个标签的列表

相关推荐