Example of Websocket on tomcat8

Websocket-tomcat

package me.simpleweb2;

import java.io.IOException;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;

/**
 * @ServerEndpoint gives the relative name for the end point This will be
 *                 accessed via ws://localhost:8080/<ProjectName>/echo Where
 *                 "localhost:8080" is the address of the host, <ProjectName> is
 *                 the name of the project and "echo" is the address to access
 *                 this class from the server
 */
@ServerEndpoint("/echo")
public class EchoServer {
	/**
	 * @OnOpen allows us to intercept the creation of a new session. The session
	 *         class allows us to send data to the user. In the method onOpen,
	 *         we'll let the user know that the handshake was successful.
	 */
	@OnOpen
	public void onOpen(Session session) {
		System.out.println(session.getId() + " has opened a connection");
		try {
			session.getBasicRemote().sendText("Connection Established");
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}

	/**
	 * When a user sends a message to the server, this method will intercept the
	 * message and allow us to react to it. For now the message is read as a
	 * String.
	 */
	@OnMessage
	public void onMessage(String message, Session session) {
		System.out.println("Message from " + session.getId() + ": " + message);
		try {
			session.getBasicRemote().sendText(message);
		} catch (IOException ex) {
			ex.printStackTrace();
		}
	}

	/**
	 * The user closes the connection.
	 * 
	 * Note: you can't send messages to the client from this method
	 */
	@OnClose
	public void onClose(Session session) {
		System.out.println("Session " + session.getId() + " has ended");
	}
}