假设这是xml:
<lib>
<books type="paperback" name="A" />
<books type="pdf" name="B" />
<books type="hardbound" name="A" />
</lib>
搜索type =“paperback”和name =“A”的书的xpath代码是什么? TIA。
目前我的代码如下:
import org.w3c.dom.*;
import javax.xml.xpath.*;
import javax.xml.parsers.*;
import java.io.IOException;
import org.xml.sax.SAXException;
public class demo {
public static void main(String[] args)
throws ParserConfigurationException, SAXException,
IOException, XPathExpressionException {
DocumentBuilderFactory domFactory =
DocumentBuilderFactory.newInstance();
domFactory.setNamespaceAware(true);
DocumentBuilder builder = domFactory.newDocumentBuilder();
Document doc = builder.parse("xml.xml");
XPath xpath = XPathFactory.newInstance().newXPath();
// XPath Query for showing all nodes value
String version="fl1.0";
XPathExpression expr = xpath.compile("//books/type[@input="paperback"]/text()");
Object result = expr.evaluate(doc, XPathConstants.NODESET);
NodeList nodes = (NodeList) result;
for (int i = 0; i < nodes.getLength(); i++) {
System.out.println(nodes.item(i).getNodeValue());
}
}
}
答案 0 :(得分:2)
/lib/books[@type='paperback' and @name='A']
如果您在使用xpath语法时遇到问题,请查看here,它有一些不错的示例。
另外,如果您只是需要有关XML和相关技术的帮助,请查看指南here
答案 1 :(得分:0)
现在你似乎在寻找像<book><type input="paperback"/></book>
这样明显错误的东西。您的xpath表达式应该类似于// books [@ type =“paperback”和@ name =“A”] / text()
答案 2 :(得分:0)
上面的答案很好......我想贡献一份资源。我见过的最好的xpath教程是here。