ITI0011:praktikum 14

Kood

<source lang="java"> package wiki;

import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.MalformedURLException; import java.net.URL; import java.net.URLEncoder;

/**

* Wikipedia API which allows to 
* extract information about an entity.
* A simple example of jar creation
* and usage. 
* @author Ago
*
*/

public class WikiAPI {

/** * Used to get output in json format. */ public static int FORMAT_JSON = 1; /** * Used to get output in xml format. */ public static int FORMAT_XML = 2;

public static void main(String[] args) { // TODO Auto-generated method stub System.out.println(getWikiInformation("Main page", WikiAPI.FORMAT_JSON)); System.out.println(getWikiInformation("Estonia", WikiAPI.FORMAT_JSON)); System.out.println(getWikiInformation("Tallinn", WikiAPI.FORMAT_JSON, "info", "recentchanges"));

}

/** * Uses Wikipedia API to retrieve general information about * a certain page in XML-format. * @param pageName Page title to be searched for * @return Response in XML-format */ public static String getWikiInformation(String pageName) { return getWikiInformation(pageName, FORMAT_XML); }

/** * Uses Wikipedia API to retrieve general information about * a certain page. * @param pageName Page title to be searched for * @param format In which format the response is returned, * use WikiAPI.FORMAT_* constants. * @return Response in the specified format */ public static String getWikiInformation(String pageName, int format) { return getWikiInformation(pageName, format, "info", null); }

/** * Uses Wikipedia API to retrieve information about * a certain page. * @param pageName Page title to be searched for * @param format In which format the response is returned, * use WikiAPI.FORMAT_* constants. * @param prop Value for "prop" parameter (properties) * @param list Value for "list" parameter * @return Response in the specified format */ public static String getWikiInformation(String pageName, int format, String prop, String list) {

String formatString = "json"; if (format == WikiAPI.FORMAT_XML) { formatString = "xml"; } String listStr = ""; if (list != null) { listStr = "&list=" + list; } try { URL url = new URL("http://en.wikipedia.org/w/api.php?format=" + formatString + "&continue=" + "&action=query&titles=" + URLEncoder.encode(pageName, "UTF-8") + "&prop=" + prop + listStr); BufferedReader br = new BufferedReader( new InputStreamReader(url.openStream())); String line; StringBuilder sb = new StringBuilder(); while ((line = br.readLine()) != null) { sb.append(line); } return sb.toString();

} catch (MalformedURLException e) { // TODO Auto-generated catch block return null; } catch (IOException e) { // TODO Auto-generated catch block return null; } }

}

</source>