How can I get the unique identification of a connection of websocket ?

[better-github-hub]

How to distinguish the uniqueness of each session of connect ?

@Override public void onOpen(WebSocket conn, ClientHandshake handshake) { conn.send("Welcome to the server!"); //This method sends a message to the new client broadcast( "new connection: " + handshake.getResourceDescriptor() ); //This method sends a message to all clients connected System.out.println("new connection to " + conn.getRemoteSocketAddress()); }

[better-github-hub]

For example this Session ： public void onOpen(Session session,@PathParam("userId") String userId) ;

I want to get the Session when a client to connect webSocketServer . please help me, thank you very much.

[PhilipRoman]

I don't think Java provides a built in way to parse URL query parameters. You can get the full query string by doing URI.create(handshake.getResourceDescriptor()).getQuery() But for splitting and decoding it, you either need a library or just search for code online

[better-github-hub]

I just want to get the unique identification of a connection of websocket . How can I get the unique identification ?

[PhilipRoman]

Web sockets don't really have a unique connection ID, you can either use the WebSocket object itself or generate a random ID in the onOpen function and store it in the WebSocket with the setAttachment method.

[better-github-hub]

the "Sec-WebSocket-Key" in the headers , Can does as a unique connection ID ?

as follows:

@Override public void onOpen(WebSocket conn, ClientHandshake handshake) { String webSocketKey = handshake.getFieldValue("Sec-WebSocket-Key"); cache.set(webSocketKey,conn); conn.send("Welcome to the server!"); //This method sends a message to the new client broadcast( "new connection: " + handshake.getResourceDescriptor() ); //This method sends a message to all clients connected System.out.println("new connection to " + conn.getRemoteSocketAddress()); }

[better-github-hub]

Thank you . setAttachment method can store any values of I want ?

[PhilipRoman]

Yes, setAttachment and getAttachment can be used for anything you want.

But keep in mind that Sec-WebSocket-Key is generated by the client, and a malicious client could send multiple connections with the same Sec-WebSocket-Key. So you can't rely on it being unique.

[better-github-hub]

That's very good . I get what I want to . setAttachment is enough . Thank you .

as follows :

@Override public void onOpen(WebSocket conn, ClientHandshake handshake) { SocketSession session=new SocketSession(); session.setId(ID.nextId()); session.setSessionMap(new HashMap<>()); conn.setAttachment(session); this.cache.set(SESSION_PREFIX +session.getId(),session); conn.send("Welcome to the server!"); //This method sends a message to the new client broadcast( "new connection: " + handshake.getResourceDescriptor() ); //This method sends a message to all clients connected System.out.println("new connection to " + conn.getRemoteSocketAddress()); }

@Data public class SocketSession implements Serializable { private String id; private Map<String,Object> sessionMap; }