Question

我试图使用带有spark的web套接字并使用/ chat作为终点url。以下是我的代码。

@ServerEndpoint("/chat")
public class Main {

  public static void main(String[] args) {
    port(Integer.valueOf(System.getenv("PORT")));
    Spark.staticFileLocation("/public");    
  }

  private static final Set<Session> sessions = Collections
          .synchronizedSet(new HashSet<Session>());

  private static final HashMap<String, String> nameSessionPair = new HashMap<String, String>();

  private JSONUtils jsonUtils = new JSONUtils();

  public static Map<String, String> getQueryMap(String query) {
      Map<String, String> map = Maps.newHashMap();
      if (query != null) {
          String[] params = query.split("&");
          for (String param : params) {
              String[] nameval = param.split("=");
              map.put(nameval[0], nameval[1]);
          }
      }
      return map;
  }

  @OnOpen
  public void onOpen(Session session) {

      System.out.println(session.getId() + " has opened a connection");

      Map<String, String> queryParams = getQueryMap(session.getQueryString());

      String name = "";

      if (queryParams.containsKey("name")) {

        name = queryParams.get("name");
          try {
              name = URLDecoder.decode(name, "UTF-8");
          } catch (UnsupportedEncodingException e) {
              e.printStackTrace();
          }

          nameSessionPair.put(session.getId(), name);
      }

      sessions.add(session);

      try {
          session.getBasicRemote().sendText(
                  jsonUtils.getClientDetailsJson(session.getId(),
                          "Your session details"));
      } catch (IOException e) {
          e.printStackTrace();
      }

      sendMessageToAll(session.getId(), name, " joined conversation!", true,
              false);

  }

  @OnMessage
  public void onMessage(String message, Session session) {

      System.out.println("Message from " + session.getId() + ": " + message);

      String msg = null;

      try {
          JSONObject jObj = new JSONObject(message);
          msg = jObj.getString("message");
      } catch (JSONException e) {
          e.printStackTrace();
      }

      sendMessageToAll(session.getId(), nameSessionPair.get(session.getId()),
              msg, false, false);
  }

  @OnClose
  public void onClose(Session session) {

      System.out.println("Session " + session.getId() + " has ended");

      String name = nameSessionPair.get(session.getId());

      sessions.remove(session);

      sendMessageToAll(session.getId(), name, " left conversation!", false,
              true);

  }

  private void sendMessageToAll(String sessionId, String name,
          String message, boolean isNewClient, boolean isExit) {

      for (Session s : sessions) {
          String json = null;

          if (isNewClient) {
              json = jsonUtils.getNewClientJson(sessionId, name, message,
                      sessions.size());

          } else if (isExit) {
              json = jsonUtils.getClientExitJson(sessionId, name, message,
                      sessions.size());
          } else {
              json = jsonUtils
                      .getSendAllMessageJson(sessionId, name, message);
          }

          try {
              System.out.println("Sending Message To: " + sessionId + ", "
                      + json);

              s.getBasicRemote().sendText(json);
          } catch (IOException e) {
              System.out.println("error in sending. " + s.getId() + ", "
                      + e.getMessage());
              e.printStackTrace();
          }
      }
  }
}

问题是永远不会调用onOpen方法，当用户到达终点url时，会抛出404错误。为什么会这样？我正在使用heroku部署它，我使用socket_url作为我的站点名称，并且我在js文件中将端口留空了。

我该如何解决这个问题？

Answer 1

此代码不适用于example from Heroku.com。这是因为tomcat和jetty runners不支持websockets注释（不知道原因）。您将能够使用嵌入式Jetty运行它。主要方法的示例，maven的pom和heroku的procfile，您可以在privateblog.info找到：

web:    java $JAVA_OPTS -cp target/JettyServer-0.0.1-SNAPSHOT-jar-with-dependencies.jar info.privateblog.Proxy $PORT

heroku无法处理Web套接字

1 个答案: