SpringBoot+WebSocket實時監(jiān)控異常
寫在前面
此異常非彼異常，標題所說的異常是業(yè)務(wù)上的異常。
最近做了一個需求，消防的設(shè)備巡檢，如果巡檢發(fā)現(xiàn)異常，通過手機端提交，后臺的實時監(jiān)控頁面實時獲取到該設(shè)備的信息及位置，然后安排員工去處理。
因為需要服務(wù)端主動向客戶端發(fā)送消息，所以很容易的就想到了用WebSocket來實現(xiàn)這一功能。
WebSocket就不做介紹了，上鏈接：
https://developer.mozilla.org/zh-CN/docs/Web/API/WebSocket
前端略微復(fù)雜，需要在一張位置分布圖上進行鼠標描點定位各個設(shè)備和根據(jù)不同屏幕大小渲染，本文不做介紹，只是簡單地用頁面樣式進行效果呈現(xiàn)。
綠色代表正常，紅色代表異常
預(yù)期效果，未接收到請求前----->id為3的提交了異常，id為3的王五變成了紅色
實現(xiàn)
前端：
直接貼代碼
<html>
????<head>
????????<meta?charset="utf-8"?/>
????????<title>實時監(jiān)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: '張三',
????????????????????????state: 1
????????????????????},
????????????????????{
????????????????????????id: 2,
????????????????????????name: '李四',
????????????????????????state: 1
????????????????????},
????????????????????{
????????????????????????id: 3,
????????????????????????name: '王五',
????????????????????????state: 1
????????????????????},
????????????????????{
????????????????????????id: 4,
????????????????????????name: '韓梅梅',
????????????????????????state: 1
????????????????????},
????????????????????{
????????????????????????id: 5,
????????????????????????name: '李磊',
????????????????????????state: 1
????????????????????},
????????????????]
????????????}
????????})
????????var?webSocket = null;
????????if?('WebSocket'?in?window) {
????????????//創(chuàng)建WebSocket對象
????????????webSocket = new?WebSocket("ws://localhost:18801/webSocket/"?+ getUUID());
????????????//連接成功
????????????webSocket.onopen = function() {
????????????????console.log("已連接");
????????????????webSocket.send("消息發(fā)送測試")
????????????}
????????????//接收到消息
????????????webSocket.onmessage = function(msg) {
????????????????//處理消息
????????????????var?serverMsg = msg.data;
????????????????var?t_id = parseInt(serverMsg) //服務(wù)端發(fā)過來的消息，ID，string需轉(zhuǎn)化為int類型才能比較
????????????????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;
????????????????????}
????????????????}
????????????};
????????????//關(guān)閉事件
????????????webSocket.onclose = function() {
????????????????console.log("websocket已關(guān)閉");
????????????};
????????????//發(fā)生了錯誤事件
????????????webSocket.onerror = function() {
????????????????console.log("websocket發(fā)生了錯誤");
????????????}
????????} else?{
????????????alert("很遺憾，您的瀏覽器不支持WebSocket！")
????????}
????????function?getUUID() { //獲取唯一的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>后端：
項目結(jié)構(gòu)是這樣子的，后面的代碼關(guān)鍵注釋都有，就不重復(fù)描述了
1、新建SpringBoot工程，選擇web和WebSocket依賴
2、配置application.yml
#端口
server:
??port: 18801
#密碼，因為接口不需要權(quán)限，所以加了個密碼做校驗
mySocket:
??myPwd: jae_1233、WebSocketConfig配置類
@Configuration
public?class?WebSocketConfig?{
????/**
?????* 注入一個ServerEndpointExporter,該Bean會自動注冊使用@ServerEndpoint注解申明的websocket endpoint
?????*/
????@Bean
????public?ServerEndpointExporter serverEndpointExporter(){
????????return?new?ServerEndpointExporter();
????}
}4、WebSocketServer類，用來進行服務(wù)端和客戶端之間的交互
/**
?* @author?jae
?* @ServerEndpoint("/webSocket/{uid}") 前端通過此URI與后端建立鏈接
?*/
@ServerEndpoint("/webSocket/{uid}")
@Component
public?class?WebSocketServer?{
????private?static?Logger log = LoggerFactory.getLogger(WebSocketServer.class);
????//靜態(tài)變量，用來記錄當前在線連接數(shù)。應(yīng)該把它設(shè)計成線程安全的。
????private?static?final?AtomicInteger onlineNum = new?AtomicInteger(0);
????//concurrent包的線程安全Set，用來存放每個客戶端對應(yīng)的WebSocketServer對象。
????private?static?CopyOnWriteArraySet sessionPools = new?CopyOnWriteArraySet();
????/**
?????* 有客戶端連接成功
?????*/
????@OnOpen
????public?void?onOpen(Session session, @PathParam(value = "uid")?String uid){
????????sessionPools.add(session);
????????onlineNum.incrementAndGet();
????????log.info(uid + "加入webSocket！當前人數(shù)為"?+ onlineNum);
????}
????/**
?????* 連接關(guān)閉調(diào)用的方法
?????*/
????@OnClose
????public?void?onClose(Session session)?{
????????sessionPools.remove(session);
????????int?cnt = onlineNum.decrementAndGet();
????????log.info("有連接關(guān)閉，當前連接數(shù)為：{}", cnt);
????}
????/**
?????* 發(fā)送消息
?????*/
????public?void?sendMessage(Session session, String message)?throws?IOException {
????????if(session != null){
????????????synchronized?(session) {
????????????????session.getBasicRemote().sendText(message);
????????????}
????????}
????}
????/**
?????* 群發(fā)消息
?????*/
????public?void?broadCastInfo(String message)?throws?IOException {
????????for?(Session session : sessionPools) {
????????????if(session.isOpen()){
????????????????sendMessage(session, message);
????????????}
????????}
????}
????/**
?????* 發(fā)生錯誤
?????*/
????@OnError
????public?void?onError(Session session, Throwable throwable){
????????log.error("發(fā)生錯誤");
????????throwable.printStackTrace();
????}
} 5、WebSocketController類，用于進行接口測試
@RestController
@RequestMapping("/open/socket")
public class WebSocketController {
????@Value("${mySocket.myPwd}")
????public String myPwd;
????@Autowired
????private WebSocketServer webSocketServer;
????/**
?????* 手機客戶端請求接口
?????* @param id 發(fā)生異常的設(shè)備ID
?????* @param pwd 密碼（實際開發(fā)記得加密）
?????* @throws IOException
?????*/
????@PostMapping(value = "/onReceive")
????public void onReceive(String id,String pwd) throws IOException {
????????if(pwd.equals(myPwd)){ //密碼校驗一致（這里舉例，實際開發(fā)還要有個密碼加密的校驗的），則進行群發(fā)
????????????webSocketServer.broadCastInfo(id);
????????}
????}
}測試
1、打開前端頁面，進行WebSocket連接
控制臺輸出，連接成功
2、因為是模擬數(shù)據(jù)，所以全部顯示正常，沒有異常提交時的頁面呈現(xiàn)
3、接下來，我們用接口測試工具Postman提交一個異常
注意id為3的這個數(shù)據(jù)的狀態(tài)變化
我們可以看到，id為3的王五狀態(tài)已經(jīng)變成異常的了，實時通訊成功。
參考：
https://developer.mozilla.org/zh-CN/docs/Web/API/WebSocket
最后
工作中有這方面關(guān)于實時監(jiān)控的需求，可以參考一下哦。
不足之處歡迎指出，覺得有用的話就點個推薦吧！
來源：cnblogs.com/jae-tech/p/15409340.html
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