如何识别java服务器端点中websocket url中的数据

Question

ws://host:port/cms/ocpp/CBNO7

这是我的第一个websocket程序，这里url定义"cms“是项目名"ocpp”是服务器端点，最后一个是每个客户端点user.How的数据更改，以获取服务器endpoint.My java服务器端点代码中的最后数据，如下所示，

`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");
        }
    }`

如何在端点获取CBNO7

Answer 1

您需要使用PathParam：http://docs.oracle.com/javaee/7/api/javax/websocket/server/PathParam.html

你最终会有这样的结果

@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);
     }
}

编辑确保导入的是javax.websocket.server.PathParam，而不是JAX-RS。