<root>
<program name="SomeProgramName">
<params>
<param name='name'>test</param>
<param name='name2'>test2</param>
</params>
</program>
</root>
我有上面的xml doc。我需要将test的值更改为新值
我在xml doc中读到了
String xmlfile = "path\\to\\file.xml"
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document doc = docBuilder.parse(xmlfile);
//get the params element
Node params = doc.getElementsByTagName("params").item(0);
//get a list of nodes in the params element
NodeList param = params.getChildNodes();
这是我被困的地方。我找不到一种方法来通过“名称”
设置其中一个参数元素的值我正在使用java 1.7
答案 0 :(得分:3)
您需要键入每个节点以键入Element,以便能够设置文本和属性。您可能需要查看XPath,这样可以简化此类操作。
import javax.xml.parsers.*;
import javax.xml.xpath.*;
import org.w3c.dom.*;
public class Demo {
public static void main(String[] args) throws Exception {
String xmlfile = "src/forum17753835/file.xml";
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document doc = docBuilder.parse(xmlfile);
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();
Element element = (Element) xpath.evaluate("/root/program/params/param[@name='name2']", doc, XPathConstants.NODE);
System.out.println(element.getTextContent());
}
}
答案 1 :(得分:0)
NodeList params = doc.getElementsByTagName("param");
for (int i = 0; i < params.getLength(); i++)
{
if (params.item(i).getAttributes().getNamedItem("name").getNodeValue().equals("name2"))
{
// do smth with element <param name='name2'>test2</param>
// that is params.item(i) in current context
}
}