websocket

 长连接推送：

 

http://www.cnblogs.com/tonyY/p/5495417.html

 

 

MAP：key-userid value-session

 

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;

@ServerEndpoint("/websocketTest")
public class WebSocketTest {
    @OnMessage
    public void onMessage(String message, Session session) throws IOException, InterruptedException {

        // Print the client message for testing purposes
        System.out.println("Received: " + message);

        // Send the first message to the client
        session.getBasicRemote().sendText("This is the first server message");

        // Send 3 messages to the client every 5 seconds
        int sentMessages = 0;
        while (sentMessages < 3) {
            Thread.sleep(5000);
            session.getBasicRemote().sendText("This is an intermediate server message. Count: " + sentMessages);
            sentMessages++;
        }

        // Send a final message to the client
        session.getBasicRemote().sendText("This is the last server message");
    }

    @OnOpen
    public void onOpen() {
        System.out.println("Client connected");
    }

    @OnClose
    public void onClose() {
        System.out.println("Connection closed");
    }
}