有没有任何方法可以在Java中创建动态@ServerEndpoint地址

Question

例如，我有一个房间

public class Room {
   private int id;
   private Set<User> users;
}

所以我希望它成为我的websocket应用程序的端点。但可能有很多房间，我希望每个房间都有自己的URI（例如，房间/1、房间/2等）

显然，@ServerEnpoint annotaion只允许常量。那么，有什么办法可以做到吗？

Answer 1

类似这样的东西：

@ServerEndpoint(value = "/rooms/{roomnumber}")
public class....
static Map<String, Session> openSessions = ...
@OnOpen
public void onConnectionOpen(final Session session, @PathParam("roomnumber") final String roomnumber, 
...
   //store roomnumber in session
   session.getUserProperties().put("roomnumber", roomnumber);
   openSessions.put( String.valueOf(session.getId()), session ) 

只向特定房间号码/客户发送消息：

// check if session corresponds to the roomnumber 
  for (Map.Entry<String, Session> entry : openSessions.entrySet()) {
    Session s = entry.getValue();
    if (s.isOpen() && s.getUserProperties().get("roomnumber").equals(roomnumber_you_want_to_address)) {
  ... 

当客户端断开连接时：

 @OnClose
public void onConnectionClose(Session session) {
    openSessions.remove(session.getId());
}

Answer 2

您可以使用此per函数在同一控制器中映射具有不同变量的请求

@RequestMapping(value = "/endpoint/{endpointVariable}", method = RequestMethod.GET)
public ReturnDTO getReturnDTO(<params>){
    // Here the variable, endpointVariable, will be accessible
    // In my experiences its always been an integer, but I'm sure a string
    // would be possible.  check with debugger
}

http://www.journaldev.com/3358/spring-mvc-requestmapping-annotation-example-with-controller-methods-headers-params-requestparam-pathvariable