1. Send a request to the following Alexa API.
https://data.alexa.com/data?cli=10&url=phenomena.com
2. The Alexa API will return the following XML response. The Alexa ranking is inside the POPULARITY element, the TEXT attribute.
<!-- Need more Alexa data? Find our APIs here: https://aws.amazon.com/marketplace/seller-profile?id=4a9dbf38-88b1-4e87-a459-271154a77d2e -->
<ALEXA VER="0.9" URL="phenomena.com/" HOME="0" AID="=" IDN="phenomena.com/">
<SD>
<POPULARITY URL="phenomena.com/" TEXT="3713994" SOURCE="panel"/>
<REACH RANK="3404850"/>
<RANK DELTA="+652325"/>
</SD>
</ALEXA>
3. We use a DOM parser to directly select the POPULARITY element and print out the value of the TEXT attribute.
package com.bad.blood.test;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
public class ReadXmlAlexaApi {
private static final String ALEXA_API = "http://data.alexa.com/data?cli=10&url=";
private final DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
public static void main(String[] args) {
ReadXmlAlexaApi obj = new ReadXmlAlexaApi();
int alexaRanking = obj.getAlexaRanking("phenomena.com");
System.out.println("Ranking: " + alexaRanking);
}
public int getAlexaRanking(String domain) {
int result = 0;
String url = ALEXA_API + domain;
try {
URLConnection conn = new URL(url).openConnection();
try (InputStream is = conn.getInputStream()) {
// unknown XML better turn on this
dbf.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
DocumentBuilder dBuilder = dbf.newDocumentBuilder();
Document doc = dBuilder.parse(is);
Element element = doc.getDocumentElement();
// find this tag "POPULARITY"
NodeList nodeList = element.getElementsByTagName("POPULARITY");
if (nodeList.getLength() > 0) {
Element elementAttribute = (Element) nodeList.item(0);
String ranking = elementAttribute.getAttribute("TEXT");
if (!"".equals(ranking)) {
result = Integer.parseInt(ranking);
}
}
}
} catch (Exception e) {
e.printStackTrace();
throw new IllegalArgumentException("Invalid request for domain : " + domain);
}
return result;
}
}
The domain phenomena.com ranked 3713994.
Ranking: 3713994
ref. https://mkyong.com/java/how-to-read-xml-file-in-java-dom-parser/