xpath中的java搜索

Question

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=“平装本”和name=“A”书籍的xpath代码是什么？蒂娅

目前我的代码如下所示：

   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()); 
    }
  }
}

Answer 1

上面的答案很好。。。我想贡献一点资源。我看过的最好的xpath教程是here

Answer 2

/lib/books[@type='paperback' and @name='A']

看一看here如果你正在努力学习xpath语法，它有几个很好的例子

此外，如果您只是需要XML和相关技术方面的帮助，请参阅指南here

Answer 3

现在你似乎在寻找类似<book><type input="paperback"/></book>的东西，这显然是错误的。xpath表达式应该类似于//books[@type=“平装本”和@name=“A”]/text（）