To access the values id1 & id2 im iterating over every value in the XML and if I find a tag named id1 or id2 I read its value into a variable. Is there a better method of reading the values id1 & id2 ?
<begin>
<total>1</total>
<values>
<factor>
<base>test</base>
<id1>id1</id1>
<id2>id2</id2>
<val>val2</val>
<newval>val1</newval>
</factor>
</values>
</begin>
If you use XPath, you can extract values directly from the Document object. In your case, the XPath to get to id1 would be /begin/id1.
You can use the Java API for XML Processing. It's a very robust way of dealing with XML in Java.
Use a SAX parser and store the text emitted after the "id1" start element as the id1 value and the text after the "id2" start element as the id2 value.
For example:
public static List<String> getIds(InputStream xmlStream) throws ParserConfigurationException, SAXException, IOException {
final List<String> ids = new ArrayList<String>();
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser saxParser = factory.newSAXParser();
saxParser.parse(xmlStream, new DefaultHandler() {
boolean getChars = false;
public void startElement(String uri, String name, String qName, Attributes attrs) throws SAXException {
if ("id1".equalsIgnoreCase(qName)) getChars = true;
if ("id2".equalsIgnoreCase(qName)) getChars = true;
}
public void characters(char cs[], int start, int len) throws SAXException {
if (getChars) {
ids.add(new String(cs, start, len));
getChars = false;
}
}
});
return ids;
}
You can use JDOM for doing this:
import org.jdom.Document;
import org.jdom.input.SAXBuilder;
public class Test {
public static void main(String[] args) throws Exception{
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build("test.xml");
String id1 = doc.getRootElement().getChild("values").getChild("factor").getChild("id1").getValue();
System.out.println(id1);
String id2 = doc.getRootElement().getChild("values").getChild("factor").getChild("id2").getValue();
System.out.println(id2);
}
}
