我需要在Java中获取某些XML对象的值,但它们位于属性标记中。我不知道该怎么做。
XML示例:
<node id="359832" version="5" timestamp="2008-05-20T15:20:46Z" uid="4499" changeset="486842" lat="50.9051565" lon="6.963755">
<tag k="amenity" v="restaurant"/>
<tag k="name" v="Campus"/>
</node>
<node id="451153" version="4" timestamp="2009-09-17T18:09:14Z" uid="508" changeset="2514480" lat="51.6020306" lon="-0.1935029">
<tag k="amenity" v="restaurant"/>
<tag k="created_by" v="JOSM"/>
<tag k="name" v="Sun and Sea"/>
</node>
我需要获得lat
和lon
的值,除了<node>
的值之外,它还在<tag k="name" v="Sun and Sea"/>
内,并且每个都有,用它做点什么。
伪代码:
foreach(node in xmlFile)
{
String name = this.name;
double lat = this.lat;
double lon = this.lon;
//my own thing here
}
我看过,但无法找到有关如何获取lat
和lon
的值的任何内容,因为它们位于属性旁边而不是嵌套。我不需要使用输入流,xml文件足够小,我不能将其存储在内存中。
答案 0 :(得分:5)
package com.sandbox;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
public class Sandbox {
public static void main(String argv[]) throws IOException, SAXException, ParserConfigurationException {
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
Document document = documentBuilder.parse(Sandbox.class.getResourceAsStream("/foo.xml"));
NodeList nodeNodeList = document.getElementsByTagName("node");
for (int i = 0; i < nodeNodeList.getLength(); i++) {
Node nNode = nodeNodeList.item(i);
System.out.println(nNode.getAttributes().getNamedItem("lat").getNodeValue());
System.out.println(nNode.getAttributes().getNamedItem("lon").getNodeValue());
}
}
}
打印出来:
50.9051565
6.963755
51.6020306
-0.1935029