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I am working on an application that requires a lot of user interaction. Its kind of a discussion form where people can comment. Currently we are using web services and every time user post a comment or a reply to a comment we are calling a webservice and it is communicating with database and doing the rest of the things. I found this process rather slow. So i read in few places that web sockets may be solution to my problem where I can directly use available apis to commiunicate with database and make my application faster. I searched a lot, in some examples available online they were using servlets too and in some they were not. It was very confusing. I just want to use html5 websockets. the UI code is a page which will send some text to backend. The JS code is: 

<script>
var connection;



function connect() {
    console.log("connection");
    connection = new WebSocket("not sure what exactly to use here");
    // Log errors 
connection.onerror = function (error) {
  console.log('WebSocket Error ');
  console.log(error);

};

// Log messages from the server 
connection.onmessage = function (e) {
  console.log('Server: ' + e.data); 
  alert("Server said: " + e.data);
};

connection.onopen = function (e) {
console.log("Connection open...");
}

connection.onclose = function (e) {
console.log("Connection closed...");
}
}


function sayHello() {
    connection.send(document.getElementById("msg").value);
}

function close() {
    console.log("Closing...");
    connection.close();
}
</script>

while creating new WebSocket object what path exactly i need to mention. Should I use servlets or not. Please give ideas about the backend java code. Thanks in advance

share|improve this question
    
I'm not sure that websockets will make the posting of new comments any quicker.As I understand it, it makes User Interfaces that that generally do a lot of polling more responsive ( so other users would see the posts quicker and without refreshing their UI ), but I don't see that the post will be ant quicker than using a web service. Before going down this route, you need to identify which is the slow bit - you may be solving the wrong problem here –  DaveH Jun 24 '13 at 7:24

1 Answer 1

up vote 1 down vote accepted

Servlet has not such support. You should use WebSocket of Java EE 7. Your code should be like this

@ServerEndpoint("/echo")
public class EchoEndpoint {
   @OnMessage
   public void onMessage(Session session, String msg) {
      try {
         session.getBasicRemote().sendText(msg);
         //Save message here into database 
      } catch (IOException e) { ... }
   }
}

For Details, see here: http://docs.oracle.com/javaee/7/tutorial/doc/websocket004.htm

share|improve this answer
    
I am new at all these, I am not sure what serverendpoint path I should pass from the javascript while sending a message if my java program is in some package –  kavinder Jun 24 '13 at 6:17
    
Java EE7 websocket directly works with JavaScript.i.e the browser where WebSocket is support. For that you need to go through the tutorial and run the example given at tutorial. –  Masud Jun 24 '13 at 6:21

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