java - Java 中的 NOAA XML 解析 - 获取纬度和经度元素

Question

我正在尝试将这个特定的纬度和经度字符串解析到用 Java 编写的 XML 解析器中，但我不确定要使用什么元素，因为 point 没有结束 />

<data>
<location>
<location-key>point1</location-key>
<point latitude="39.95" longitude="-75.17"/>
</location>
<moreWeatherInformation applicable-location="point1">
http://forecast.weather.gov/MapClick.php?textField1=39.95&textField2=-75.17
</moreWeatherInformation>
<time-layout time-coordinate="local" summarization="none">
<layout-key>k-p24h-n1-1</layout-key>
<start-valid-time>2013-10-30T08:00:00-04:00</start-valid-time>
<end-valid-time>2013-10-30T20:00:00-04:00</end-valid-time>
</time-layout>
<time-layout time-coordinate="local" summarization="none">
<layout-key>k-p24h-n2-2</layout-key>
<start-valid-time>2013-10-29T20:00:00-04:00</start-valid-time>
<end-valid-time>2013-10-30T09:00:00-04:00</end-valid-time>
<start-valid-time>2013-10-30T20:00:00-04:00</start-valid-time>
<end-valid-time>2013-10-31T09:00:00-04:00</end-valid-time>
</time-layout>
<parameters applicable-location="point1">
<temperature type="maximum" units="Fahrenheit" time-layout="k-p24h-n1-1">
<name>Daily Maximum Temperature</name>
<value>64</value>
</temperature>
<temperature type="minimum" units="Fahrenheit" time-layout="k-p24h-n2-2">
<name>Daily Minimum Temperature</name>
<value>44</value>
<value>52</value>
</temperature>
</parameters>
</data>

使用下面的代码，我得到以下输出。

try {
            File newXMLFile = new File("H:\\520\\SOAP Data Acquisition\\testNOAA.xml");
            DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
            Document doc = dBuilder.parse(newXMLFile);

            doc.getDocumentElement().normalize();

            System.out.println("Title: " + doc.getElementsByTagName("title").item(0).getTextContent());
            System.out.println("Field: " + doc.getElementsByTagName("field").item(0).getTextContent());
            System.out.println("category: " + doc.getElementsByTagName("category").item(0).getTextContent());
            System.out.println("Date Created: " + doc.getElementsByTagName("creation-date").item(0).getTextContent());

            NodeList nList = doc.getElementsByTagName("data");

            for(int i = 0; i < nList.getLength(); i++){
                Node nNode = nList.item(i);
                System.out.println("\nCurrent Element: " + nNode.getNodeName());
                if(nNode.getNodeType() == Node.ELEMENT_NODE){
                    Element eElement = (Element) nNode;

                    System.out.println("Location: " + eElement.getAttribute("point"));
                    System.out.println("Start Time: "+eElement.getElementsByTagName("start-valid-time").item(0).getTextContent());
                    System.out.println("End Time: "+eElement.getElementsByTagName("end-valid-time").item(0).getTextContent());

                    System.out.println("");
                }
            }
        }catch(Exception e){
            e.printStackTrace();
        }

输出:

Title: NOAA's National Weather Service Forecast Data
Field: meteorological
category: forecast
Date Created: 2013-10-29T14:42:58Z

Current Element: data
Location: 
Start Time: 2013-10-30T08:00:00-04:00
End Time: 2013-10-30T20:00:00-04:00

Answer 1

对于代码的相关部分，请尝试这样做。假设整个“数据”标签中只有一个“点”(或者至少，您只对第一个“点”感兴趣)，但它适用于您发布的内容 em>.

        NodeList nList = doc.getElementsByTagName("data");

        for(int i = 0; i < nList.getLength(); i++){
            Node nNode = nList.item(i);
            System.out.println("\nCurrent Element: " + nNode.getNodeName());
            if(nNode.getNodeType() == Node.ELEMENT_NODE){
                Element eElement = (Element) nNode;

                Element point = (Element)(eElement.getElementsByTagName("point").item(0));
                System.out.println("Location: " + point.getAttribute("latitude") + ", " + point.getAttribute("longitude"));
                System.out.println("Start Time: "+eElement.getElementsByTagName("start-valid-time").item(0).getTextContent());
                System.out.println("End Time: "+eElement.getElementsByTagName("end-valid-time").item(0).getTextContent());

                System.out.println("");
            }
        }