Java EE7 Websockets服务器端点不起作用

Question

Here's my server's code

package local.xx.mavenws;

import java.io.IOException;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
import javax.enterprise.context.ApplicationScoped;
import org.joda.time.DateTime;

@ApplicationScoped
@ServerEndpoint("/")
public class Server {

    private final ArrayList<Session> sessions;

    public Server() {
        this.sessions = new ArrayList<>();
    }

    @OnOpen
    public void onOpen(Session session) {
        this.sessions.add(session);
        this.echo("Client connected!");
    }

    @OnClose
    public void onClose(Session session) {
        this.sessions.remove(session);
        this.echo("Client disconnected!");
    }

    @OnError
    public void onError(Throwable error) {
        this.echo("Error occured!");
        this.echo(error.getLocalizedMessage());
    }

    @OnMessage
    public void onMessage(String message, Session session) {
        try {
            message = "[" + this.currentDate() + "] " + message;
            this.echo(message);
            for( Session sess : this.sessions ) {
                sess.getBasicRemote().sendText(message);
            }
        } catch (IOException ex) {
            Logger.getLogger(Server.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    private void echo(String info) {
        System.out.println(info);
    }
    private String currentDate() {
        String dateArray[] = (new DateTime()).toString().split("T");
        String date = dateArray[0] + " " + (dateArray[1].split("\\.")[0]);
        return date;
    }
}

I want it to send received message to all the users connected. The problem is, it treats every connection individually like each one of them had it's own instance of the server. When I connect in two browser windows, messages show separately. Does anybody have any ideas on this?

Answer 1

Finally got this working! The solution is that the sessions variable must be static and I had to call it always by Server scope, not this . That implicates the fact that, despite there's a new instance of Server created for every user connected, the variable is mutual for everyone.