xml dom解析器在java中按名称查找标记

我有一个xml：

我只是想得到城市和温度，我试过这个：

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();
}

摘要25x。如何获取城市和温度值？

尝试getTextContent（）而不是getNodeValue（）

尝试以下代码

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).getTextContent();
}

HttpParams httpParameters=new BasicHttpParams（）；
HttpClient HttpClient=新的默认HttpClient（httpParameters）；
HttpGet HttpGet=新的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（）；
字符串res=“”；
DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance（）；
DocumentBuilder db=dbf.newDocumentBuilder（）；
Document doc=db.parse（新输入源（in））；
doc.getDocumentElement（）.normalize（）；
NodeList loc=doc.getElementsByTagName（“本地”）；
对于（int i=0；i

正确的做法是实际使用Xpath。是否使用正则表达式或SQL在数据库中搜索？同样，在XML文件中搜索也是通过Xpath完成的

 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()); 
    }
}

packagexpath；
导入javax.xml.parsers.DocumentBuilder；
导入javax.xml.parsers.DocumentBuilderFactory；
导入javax.xml.xpath.xpath；
导入javax.xml.xpath.XPathConstants；
导入javax.xml.xpath.XPathExpression；
导入javax.xml.xpath.XPathFactory；
导入org.w3c.dom.Document；
导入org.w3c.dom.NodeList；
公共类简单化{
公共静态void main（字符串[]args）引发异常{
DocumentBuilderFactory工厂=DocumentBuilderFactory.newInstance（）；
factory.setNamespaceAware（false）；//永远不要忘记这一点！
DocumentBuilder=factory.newDocumentBuilder（）；
Document doc=builder.parse（“/Users/eugenrabii/Desktop/MyFile.xml”）；
XPathFactory XPathFactory=XPathFactory.newInstance（）；
XPath=xPathFactory.newXPath（）；
XPathExpression=xpath.compile（“//city/text（）”）；
Object result=xPathExpression.evaluate（doc，XPathConstants.NODESET）；
System.out.println（result.toString（））；
节点列表节点=（节点列表）结果；
System.out.println（nodes.getLength（））；
对于（int i=0；i

---

}

@Robertoq你的意思是什么？我只是猜测XML结构可能会改变？你能提供你测试的XML文件吗？

 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()); 
    }
}