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消防的设备巡检，如果巡检发现异常，通过手机端提交，后台的实时监控页面实时获取到该设备的信息及位置，然后安排员工去处理。需要服务端主动向客户端发送消息，用WebSocket来实现这一功能。
前端
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>实时监控</title>
</head> <style> .item { display: flex; border-bottom: 1px solid #000000;
justify-content: space-between; width: 30%; line-height: 50px; height: 50px; }
.item span:nth-child(2){ margin-right: 10px; margin-top: 15px; width: 20px;
height: 20px; border-radius: 50%; background: #55ff00; } .nowI{ background:
#ff0000 !important; } </style> <body> <div id="app"> <div v-for="item in list"
class="item"> <span>{{item.id}}.{{item.name}}</span> <span
:class='item.state==-1?"nowI":""'></span> </div> </div> </body> <script
src="./js/vue.min.js"></script> <script type="text/javascript"> var vm = new
Vue({ el: "#app", data: { list: [{ id: 1, name: '张三', state: 1 }, { id: 2,
name: '李四', state: 1 }, { id: 3, name: '王五', state: 1 }, { id: 4, name: '韩梅梅',
state: 1 }, { id: 5, name: '李磊', state: 1 }, ] } }) var webSocket = null; if
('WebSocket' in window) { //创建WebSocket对象 webSocket = new
WebSocket("ws://localhost:18801/webSocket/" + getUUID()); //连接成功
webSocket.onopen = function() { console.log("已连接"); webSocket.send("消息发送测试") }
//接收到消息 webSocket.onmessage = function(msg) { //处理消息 var serverMsg = msg.data;
var t_id = parseInt(serverMsg) //服务端发过来的消息，ID，string需转化为int类型才能比较 for (var i =
0; i < vm.list.length; i++) { var item = vm.list[i]; if(item.id == t_id){
item.state = -1; vm.list.splice(i,1,item) break; } } }; //关闭事件
webSocket.onclose = function() { console.log("websocket已关闭"); }; //发生了错误事件
webSocket.onerror = function() { console.log("websocket发生了错误"); } } else {
alert("很遗憾，您的浏览器不支持WebSocket！") } function getUUID() { //获取唯一的UUID return
'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) { var r =
Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8); return
v.toString(16); }); } </script> </html>
新建SpringBoot工程，选择web和WebSocket依赖
配置application.yml
#端口 server: port: 18801 #密码，因为接口不需要权限，所以加了个密码做校验 mySocket: myPwd: jae_123
WebSocketConfig配置类
@Configuration public class WebSocketConfig { /** *
注入一个ServerEndpointExporter,该Bean会自动注册使用@ServerEndpoint注解申明的websocket endpoint
*/ @Bean public ServerEndpointExporter serverEndpointExporter(){
return new ServerEndpointExporter(); } }
WebSocketServer类，用来进行服务端和客户端之间的交互。
/** * @author jae * @ServerEndpoint("/webSocket/{uid}") 前端通过此URI与后端建立链接 */
@ServerEndpoint("/webSocket/{uid}") @Component public class WebSocketServer {
private static Logger log = LoggerFactory.getLogger(WebSocketServer.class);
//静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。 private static final AtomicInteger onlineNum =
new AtomicInteger(0); //concurrent包的线程安全Set，用来存放每个客户端对应的WebSocketServer对象。
private static CopyOnWriteArraySet<Session> sessionPools = new
CopyOnWriteArraySet<Session>(); /** * 有客户端连接成功 */ @OnOpen public void
onOpen(Session session, @PathParam(value = "uid") String uid){
sessionPools.add(session); onlineNum.incrementAndGet(); log.info(uid +
"加入webSocket！当前人数为" + onlineNum); } /** * 连接关闭调用的方法 */ @OnClose public void
onClose(Session session) { sessionPools.remove(session); int cnt =
onlineNum.decrementAndGet(); log.info("有连接关闭，当前连接数为：{}", cnt); } /** * 发送消息 */
public void sendMessage(Session session, String message) throws IOException {
if(session != null){ synchronized (session) {
session.getBasicRemote().sendText(message); } } } /** * 群发消息 */ public void
broadCastInfo(String message) throws IOException { for (Session session :
sessionPools) { if(session.isOpen()){ sendMessage(session, message); } } } /**
* 发生错误 */ @OnError public void onError(Session session, Throwable throwable){
log.error("发生错误"); throwable.printStackTrace(); } }
WebSocketController类
@RestController @RequestMapping("/open/socket") public class
WebSocketController { @Value("${mySocket.myPwd}") public String myPwd;
@Autowired private WebSocketServer webSocketServer; /** * 手机客户端请求接口 * @param id
发生异常的设备ID * @param pwd 密码（实际开发记得加密） * @throws IOException */ @PostMapping(value
= "/onReceive") public void onReceive(String id,String pwd) throws IOException
{ if(pwd.equals(myPwd)){ //密码校验一致（这里举例，实际开发还要有个密码加密的校验的），则进行群发
webSocketServer.broadCastInfo(id); } } }
测试
打开前端页面，进行WebSocket连接，控制台输出，连接成功