websocket

websocket的依赖：

<dependency>     <groupId>javax</groupId>     <artifactId>javaee-api</artifactId>     <version>7.0</version> </dependency>

类

package com.unitedcoders.demo;


import java.io.IOException;


import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;




@ServerEndpoint("/websocket")
public class Websocket {


 @OnMessage
 public void onMessage(String message, Session session)
   throws IOException, InterruptedException {
  
   // Print the client message for testing purposes
   System.out.println("Received: " + message);
  
   // Send the first message to the client
   session.getBasicRemote().sendText("This is the first server message");
  
   // Send 3 messages to the client every 5 seconds
   int sentMessages = 0;
   while(sentMessages < 3){
     Thread.sleep(5000);
     session.getBasicRemote().
       sendText("This is an intermediate server message. Count: "
         + sentMessages);
     sentMessages++;
   }
  
   // Send a final message to the client
   session.getBasicRemote().sendText("This is the last server message");
 }
  
 @OnOpen
 public void onOpen() {
   System.out.println("Client connected");
 }
 
 @OnClose
 public void onClose() {
   System.out.println("Connection closed");
 }


}