我一直试图让它工作三个小时。这些是我尝试的两段代码和xml文件的链接。有人能告诉我我做错了什么或如何轻松做到这一点?我只想在“current_conditions”元素中将当前临时值存储为“temp_f”。如果有一个更好的方式来做这个比我想知道的任何尝试。非常感谢你!
这是我从网上下载的xml文件的链接: http://www.google.com/ig/api?weather=10598
这是我用来从网上获取xml数据的代码:
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(url);
// HttpGet get = new HttpGet();
try {
HttpResponse rsp = client.execute(get);
String xmltemp = EntityUtils.toString(rsp.getEntity());
System.out.println(xmltemp);
然后我尝试了这两个尝试解析xml但都没有工作。
DocumentBuilderFactory factory1 = DocumentBuilderFactory
.newInstance();
factory1.setNamespaceAware(true); // never forget this!
InputSource source = new InputSource(new StringReader(xmltemp));
Document doc = factory1.newDocumentBuilder().parse(source);
doc.getDocumentElement().normalize();
System.out.println("Root element "
+ doc.getDocumentElement().getNodeName());
Log.d("OUTPUT","Root element "
+ doc.getDocumentElement().getNodeName());
NodeList nodeLst = doc.getElementsByTagName("weather");
for (int s = 0; s < nodeLst.getLength(); s++) {
Node fstNode = nodeLst.item(s);
if (fstNode.getNodeType() == Node.ELEMENT_NODE) {
Element fstElmnt = (Element) fstNode;
NodeList fstNmElmntLst = ((Document) fstElmnt)
.getElementsByTagName("module_id");
Element fstNmElmnt = (Element) fstNmElmntLst.item(0);
NodeList fstNm = ((Node) fstNmElmnt).getChildNodes();
System.out.println(((Node) fstNm.item(0)).getNodeValue());
newal.add("" + ((Node) fstNm.item(0)).getNodeValue());
Log.d("OUTPUT","" + ((Node) fstNm.item(0)).getNodeValue());
}
}
而且:
DocumentBuilderFactory factory1 = DocumentBuilderFactory
.newInstance(); factory1.setNamespaceAware(true); // never forget this!
InputSource source = new InputSource(new
StringReader(xmltemp)); Document doc =
factory1.newDocumentBuilder().parse(source);
XPathFactory factory11 = XPathFactory.newInstance(); XPath xpath1
= factory11.newXPath(); XPathExpression expr1 = xpath1 .compile(
"//forecast_information[postal_code='10598']/forecast_date/text()"
); Object result = expr1.evaluate(doc, XPathConstants.NODESET);
NodeList nodes = (NodeList) result; for (int i = 0; i <
nodes.getLength(); i++) {
System.out.println(nodes.item(i).getNodeValue());
Log.d("1010101010101",nodes.item(i).getNodeValue()); }
编辑: 所以这是我现在尝试使用的代码,但每次运行它我都会在logcat中收到此错误:
09-15 20:26:47.359: DEBUG/ErOr(17663): java.lang.ClassCastException: org.apache.harmony.xml.dom.ElementImpl
这是代码:
DocumentBuilderFactory factory1 = DocumentBuilderFactory.newInstance();
factory1.setNamespaceAware(true); // never forget this!
InputSource source = new InputSource(new StringReader(xmltemp));
Document doc = factory1.newDocumentBuilder().parse(source);
String newstring = "" + ((DocumentBuilderFactory) ((Document) doc.getDocumentElement().
getElementsByTagName("current_conditions").item(0)).
getElementsByTagName("temp_f").item(0)).
getAttribute("data");
答案 0 :(得分:0)
您需要了解的一件事是“module_id”不是一个元素,它是一个属性。因此,您无法使用getElementsByTagName(“module_id”)检索其值。此外,fstElmnt永远不会是一个文档 - 它是一个元素,因为你已经用getNodeType()确定了它。要获取module_id,您应该尝试:fstElement.getAttribute(“module_id”)。
但回到你的主要问题:要获得温度值,试试这个:
doc.getDocumentElement().
getElementsByTagName("current_conditions").item(0).
getElementsByTagName("temp_f").item(0).
getAttribute("data");
我认为就是这样 - 未经测试!