投资建设一个网站多少钱/最近的重要新闻

1、webSocket实现代码

@Component
public class WebSocketStompConfig {//这个bean的注册,用于扫描带有@ServerEndpoint的注解成为websocket// ,如果你使用外置的tomcat就不需要该配置文件@Beanpublic ServerEndpointExporter serverEndpointExporter() {return new ServerEndpointExporter();}
}

@Component
@ServerEndpoint(value = "/webSocket")
@Slf4j
public class WebSocket {private static int onlineCount = 0;private static ConcurrentHashMap<String, Set<Session>> webSocketMap  = new ConcurrentHashMap<>();private Session session;@OnOpenpublic void onOpen(Session session) {this.session = session;// 获取URL中的参数Map<String, List<String>> params = session.getRequestParameterMap();List<String> funcTypes = params.get("funcType");if (!funcTypes.isEmpty()) {// 取出funcType参数的值String funcType = funcTypes.get(0);if(webSocketMap.containsKey(funcType)){webSocketMap.get(funcType).add(session);}else{Set<Session> sessionSet = new HashSet<>();sessionSet.add(session);webSocketMap.put(funcType,sessionSet);}}System.out.println("有新连接加入！当前在线人数为" + getOnlineCount());}@OnClosepublic void onClose(){webSocketMap=new ConcurrentHashMap<>();log.info("有一连接关闭！当前在线人数为" + getOnlineCount());}@OnMessagepublic void onMessage(String message, Session session) {System.out.println("来自客户端的消息:" + message);}@OnErrorpublic void onError(Session session, Throwable error) {System.out.println("发生错误");error.printStackTrace();}public static void sendMessage(Session session, String message) throws IOException {session.getBasicRemote().sendText(message);}public static synchronized int getOnlineCount() {return onlineCount;}public static synchronized void addOnlineCount() {WebSocket.onlineCount++;}public static synchronized void subOnlineCount() {WebSocket.onlineCount--;}public static void setOnlineCount(int onlineCount) {WebSocket.onlineCount = onlineCount;}public static ConcurrentHashMap<String, Set<Session>> getWebSocketMap() {return webSocketMap;}public static void setWebSocketMap(ConcurrentHashMap<String, Set<Session>> webSocketMap) {WebSocket.webSocketMap = webSocketMap;}public Session getSession() {return session;}public void setSession(Session session) {this.session = session;}/*** 发送自定义消息* */public static void sendInfo(String message,String funcType) throws Exception {if(webSocketMap.containsKey(funcType)){Set<Session> sessionSet = webSocketMap.get(funcType);if(sessionSet!=null){for (Session session : sessionSet) {if(session.getBasicRemote()!=null){session.getBasicRemote().sendText(message);}}}}else{log.error("订阅类型："+funcType+",不存在！");throw new Exception("连接已关闭，请刷新页面后重试");}}}

二、java代码调用，往websocker赋数据

WebSocket.sendInfo(JSON.toJSONString("sdfasd232"),"3");

三、测试是否连接成功以及推送信息

四、前端代码处理

/*** 初始化websocket连接*/
function initWebSocket() {var websocket = null;if('WebSocket' in window) {websocket = new WebSocket("ws://127.0.0.1:8080/webSocket?funcType=3" );} else {alert("该浏览器不支持websocket！");}websocket.onopen = function(event) {console.log("建立连接");websocket.send('Hello WebSockets!');}websocket.onclose = function(event) {console.log('连接关闭')reconnect(); //尝试重连websocket}//建立通信后，监听到后端的数据传递websocket.onmessage = function(event) {let data = JSON.parse(event.data);//业务处理....if(data.step == 1){alert(data.msg);}}websocket.onerror = function() {// notify.warn("websocket通信发生错误！");// initWebSocket()}window.onbeforeunload = function() {websocket.close();}
// 重连
function reconnect() {console.log("正在重连");// 进行重连setTimeout(function () {initWebSocket();}, 1000);
}