how to identify data at the websocket url in java serverendpoint - websocket

Question

ws://host:port/cms/ocpp/CBNO7
This is my first websocket program,here the url defines "cms" is projectname "ocpp" is serverendpoint and the last one is the data changes for every client endpoint user.How to get the last data in the server endpoint.My java serverendpoint code as follows,
`import java.io.IOException;
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.ws.rs.PathParam;
#ServerEndpoint("/ocpp")
public class OcppWebsocketServer {
#OnOpen
public void onOpen(Session session) throws IOException {
System.out.println(session.getId() + " has opened a connection");
try {
session.getBasicRemote().sendText("Connection Established");
} catch (IOException ex) {
ex.printStackTrace();
}
}
#OnMessage
public void onMessage(String message, Session session) {
System.out.println("Message from " + session.getId() + ": " + message);
}
#OnError
public void onError(Throwable error) {
System.out.println("error = " + error);
Logger.getLogger(OcppWebsocketServer.class.getName()).log(Level.SEVERE, null, error);
}
#OnClose
public void onClose(Session session) {
System.out.println("Session " + session.getId() + " has ended");
}
}`
how to get CBNO7 at the endpoint

Answer 1

You need to use the PathParam: http://docs.oracle.com/javaee/7/api/javax/websocket/server/PathParam.html
You'll end up with something like
#ServerEndpoint("/cms/ocpp/{parameter}")
public class OcppWebsocketServer{
#OnMessage
public void onMessage(#PathParam("parameter") String param, String message, Session session) {
// it'll print CBN07
System.out.println(param);
}
}
Edit
Make sure you import javax.websocket.server.PathParam and not the JAX-RS one