ping.java

List<String> hubUrls = new ArrayList<String>();

hubUrls.add(urlMapping.getUserUrls(dot.getAuthor()).getRecentAtomFeedUrl().toString());
hubUrls.add(urlMapping.getUserUrls(dot.getAuthor()).getHomeAtomFeedUrl().toString());
hubUrls.add(urlMapping.getUserUrls(dot.getAuthor()).getCreatedAtomFeedUrl().toString());
hubUrls.add(urlMapping.getDotUrls(dot).getAtomFeed().toString());

for (User user : userFollowDao.getFollowers(dot.getAuthor())) {
  hubUrls.add(urlMapping.getUserUrls(user).getHomeAtomFeedUrl().toString());
}

StringBuilder body = new StringBuilder("hub.mode=publish");
for (String hubUrl : hubUrls) {
  body.append("&hub.url=").append(URLEncoder.encode(hubUrl, "UTF8"));
}

URL url = new URL(PUBSUBHUBBUB_HUB);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream(), "UTF8");
try {
  wr.write(body.toString());
  wr.flush();

  String responseBody = getResponseBody(conn);
  boolean success = conn.getResponseCode() == 204;

  // ... process response
} finally {
  wr.close();
}