xml dom解析器通过java中的名称查找标签 [英] xml dom parser find tag by name in java

问题描述

我有一个xml：
http://netmobileag.accu-weather.com/widget/netmobileag/weather-data.asp?slat=48.04960&slon=21.71420&metric=1

我只是想得到城市和温度，我试过这个：

I just want to get city and temperature, i tried this:

HttpParams httpParameters = new BasicHttpParams();

HttpClient httpclient = new DefaultHttpClient(httpParameters);
HttpGet httpget = new HttpGethttp://netmobileag.accu weather.com/widget/netmobileag/weather-data.asp?slat=48.04960&slon=21.71420&metric=1");

HttpResponse response = httpclient.execute(httpget);

InputStream in = response.getEntity().getContent();

String res = "";

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document doc = db.parse(new InputSource(in));
doc.getDocumentElement().normalize();

NodeList loc = doc.getElementsByTagName("local");

for (int i = 0; i < loc.item(0).getChildNodes().getLength(); i++) {
    res = res + "\n" + loc.item(0).getChildNodes().item(0).getNodeValue();
}

但是res将是

#text
#text
 ...

summary 25x。如何获得城市和温度值？

summary 25x. How can I get the city and temperature value?

推荐答案

在这里做的正确的事是实际使用XPath。您是否使用正则表达式或SQL搜索数据库？同样的，通过XPath搜索XML文件。

The right thing to do here is to use Xpath actually. Do you search in a Database with Regex or SQL? Same here, searching in XML files is done via XPath.

 package xpath;

 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.xpath.XPath;
 import javax.xml.xpath.XPathConstants;
 import javax.xml.xpath.XPathExpression;
 import javax.xml.xpath.XPathFactory;

 import org.w3c.dom.Document;
 import org.w3c.dom.NodeList;

 public class SimpleParsing {
public static void main(String[] args) throws Exception {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    factory.setNamespaceAware(false); // never forget this!
    DocumentBuilder builder = factory.newDocumentBuilder();

    Document doc = builder.parse("/Users/eugenrabii/Desktop/MyFile.xml");

    XPathFactory xPathFactory = XPathFactory.newInstance();
    XPath xpath = xPathFactory.newXPath();

    XPathExpression xPathExpression = xpath.compile("//city/text()");

    Object result = xPathExpression.evaluate(doc, XPathConstants.NODESET);

    System.out.println(result.toString());

    NodeList nodes = (NodeList) result;

    System.out.println(nodes.getLength());
    for (int i = 0; i < nodes.getLength(); i++) {
        System.out.println(nodes.item(i).getNodeValue()); 
    }
}

}

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