[GAE/Java] 指定したRSSフィードのタイトルとURLを取り込んだり表示したりする

指定したRSSフィードのタイトルとURLを取り込んだり表示したりする。

RSSの取得にHorroRSSを使用


実際のEntityはKind名 "Link"だけだけど、親Keyとして"Feed"というKind名を割り当てて保存


ParentKey                                                        Key
======================================     =========================================
Kind       Name(ID)                                          /  Kind:    Name(ID)
======  ===============================     =====  =================================
"Feed"  http://hogehoge1.example.com/?xml   / "Link" http://hogehoge1.example.com/ent1.html

"Feed"  http://hogehoge1.example.com/?xml   / "Link" http://hogehoge1.example.com/ent2.html

"Feed"  http://hogehoge1.example.com/?xml   / "Link" http://hogehoge1.example.com/ent3.html

"Feed"  http://hogehoge2.example.com/?xml   / "Link" http://hogehoge2.example.com/ent1.html

"Feed"  http://hogehoge2.example.com/?xml   / "Link" http://hogehoge2.example.com/ent1.html

"Feed"  http://hogehoge3.example.com/?xml   / "Link" http://hogehoge3.example.com/ent6.html

class StoreRSS

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import java.util.*;

import org.horrabin.horrorss.*;

import com.google.appengine.api.datastore.*;

public class StoreRSS {

DatastoreService ds;

String[] rsslist= {"...", "...", "...", "..."}; //ここにRSSFeedのURL。Datastore指定するのめんどかったから。

ArrayList<String> entitylist;

int MAXENTNUM = 5;

public StoreRSS(){

    ds = DatastoreServiceFactory.getDatastoreService();

}

public void collect(){

for (String rssfeed:getRssList()){

Key ribkey = KeyFactory.createKey("Feed",rssfeed);

List<RssItemBean> rib = pullEntityList(rssfeed);

List<Entity> entl = new ArrayList<Entity>();

for(RssItemBean item:rib){

Entity ent = new Entity("Link",item.getLink(),ribkey);

ent.setProperty("title",item.getTitle());

ent.setProperty("link", item.getLink());

entl.add(ent);

}

ds.put(entl);

}

}

public List<String> getRssList(){

// TODO: to get from Datastore: now still get from variable...  

return Arrays.asList(rsslist);

}

public List<RssItemBean> pullEntityList(String rssfeed){

RssParser rss = new RssParser(rssfeed);

   rss.setCharset("utf8");

   try{

      rss.parse();

      List<RssItemBean> tempitems= rss.getItems().subList(0, MAXENTNUM); //Obtain a Vector of item elements (RssItemBean)

      return tempitems;

   }catch(Exception e){

    e.printStackTrace();

    return null;

      //Treat the exception as you want

   }

}

public List<Entity> getEntityList(String rssfeed){

Query rssquery = new Query("Link");

rssquery.setAncestor(KeyFactory.createKey("Feed", rssfeed));

PreparedQuery pq = ds.prepare(rssquery);

List<Entity> results = pq.asList(FetchOptions.Builder.withLimit(MAXENTNUM));//念のため個数制限

return results;

}

}

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