我遇到了从Java DOM正确调用getAttributeNS()(以及其他NS方法)的问题。首先,这是我的示例XML文档:
<?xml version="1.0" encoding="UTF-8"?>
<bookstore>
<book xmlns:c="http://www.w3schools.com/children/" xmlns:foo="http://foo.org/foo" category="CHILDREN">
<title foo:lang="en">Harry Potter</title>
<author>J K. Rowling</author>
<year>2005</year>
<price>29.99</price>
</book>
</bookstore>
这是我的小Java类,它使用DOM并调用getAttributeNS:
package com.mycompany.proj;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;
import java.io.File;
public class AttributeNSProblem
{
public static void main(String[] args)
{
try
{
File fXmlFile = new File("bookstore_ns.xml");
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
Document doc = dBuilder.parse(fXmlFile);
System.out.println("Root element: " + doc.getDocumentElement().getNodeName());
NodeList nList = doc.getElementsByTagName("title");
Element elem = (Element)nList.item(0);
String lang = elem.getAttributeNS("http://foo.org/foo", "lang");
System.out.println("title lang: " + lang);
lang = elem.getAttribute("foo:lang");
System.out.println("title lang: " + lang);
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
当我调用getAttributeNS(&#34; http://foo.org/foo&#34;,&#34; lang&#34;)时,它返回一个空字符串。我也试过getAttributeNS(&#34; foo&#34;,&#34; lang&#34;),结果相同。
检索由命名空间限定的属性值的正确方法是什么?
感谢。
答案 0 :(得分:1)
在DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
之后,立即添加dbFactory.setNamespaceAware(true);