Spring boot集成Websocket,前端監聽心跳實現


第一:引入jar

由於項目是springboot的項目所以我這邊簡單的應用了springboot自帶的socket jar

<dependency>  
           <groupId>org.springframework.boot</groupId>  
           <artifactId>spring-boot-starter-websocket</artifactId>  
</dependency>

第二:Socket代碼編寫

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

/**
 * 開啟WebSocket支持
 */
@Configuration  
public class WebSocketConfig {  
    
    /**
     *  注入對象ServerEndpointExporter,這個bean會自動注冊使用了@ServerEndpoint注解聲明的Websocket endpoint
     * @return
     */
    @Bean  
    public ServerEndpointExporter serverEndpointExporter() {  
        return new ServerEndpointExporter();  
    }  
  

}
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

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

import org.springframework.stereotype.Component;

import lombok.extern.slf4j.Slf4j;
/**
* 發送消息的類
*/ @Slf4j @Component @ServerEndpoint(value
= "/websocket/{sid}") public class WebSocketServer { //靜態變量,用來記錄當前在線連接數。應該把它設計成線程安全的。 private static int onlineCount = 0; //concurrent包的線程安全Set,用來存放每個客戶端對應的MyWebSocket對象。 private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>(); //與某個客戶端的連接會話,需要通過它來給客戶端發送數據 private Session session; //接收sid private String sid=""; /** * 連接建立成功調用的方法*/ @OnOpen public void onOpen(Session session,@PathParam("sid") String sid) { this.session = session; webSocketSet.add(this); //加入set中 addOnlineCount(); //在線數加1 log.info("有新窗口開始監聽:"+sid+",當前在線人數為" + getOnlineCount()); this.sid=sid; try { sendMessage("連接成功"); } catch (IOException e) { log.error("websocket IO異常"); } } /** * 連接關閉調用的方法 */ @OnClose public void onClose() { webSocketSet.remove(this); //從set中刪除 subOnlineCount(); //在線數減1 log.info("有一連接關閉!當前在線人數為" + getOnlineCount()); } /** * 收到客戶端消息后調用的方法 * * @param message 客戶端發送過來的消息*/ @OnMessage public void onMessage(String message, Session session) { log.info("收到來自窗口"+sid+"的信息:"+message); //群發消息 for (WebSocketServer item : webSocketSet) { try { item.sendMessage(message); } catch (IOException e) { e.printStackTrace(); } } } /** * * @param session * @param error */ @OnError public void onError(Session session, Throwable error) { log.info("非正常關閉,發生錯誤!====>" + error.toString() + "當前在線人數為" + getOnlineCount()); } /** * 實現服務器主動推送 */ public void sendMessage(String message) throws IOException { this.session.getBasicRemote().sendText(message); } /** * 群發自定義消息 * */ public static void sendInfo(String message,@PathParam("sid") String sid) throws IOException { log.info("推送消息到窗口"+sid+",推送內容:"+message); for (WebSocketServer item : webSocketSet) { try { //這里可以設定只推送給這個sid的,為null則全部推送 if(sid==null) { item.sendMessage(message); }else if(item.sid.equals(sid)){ item.sendMessage(message); } } catch (IOException e) { continue; } } } public static synchronized int getOnlineCount() { return onlineCount; } public static synchronized void addOnlineCount() { WebSocketServer.onlineCount++; } public static synchronized void subOnlineCount() { WebSocketServer.onlineCount--; } }
發送消息調用
try {
    WebSocketServer.sendInfo("自定義需要推送的消息" ,"111");
} catch (IOException e) {
    e.printStackTrace();
}

上述代碼在發送消息時,可以支持一條消息對應多個窗口

如果想要使用一個消息值推送到一個窗口,就使用一下springboot的管理

具體實現:

添加一個管理的類

import javax.websocket.server.ServerEndpointConfig;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;

public class MySpringConfigurator extends ServerEndpointConfig.Configurator implements ApplicationContextAware {
    private static volatile ApplicationContext context;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        MySpringConfigurator.context=applicationContext;
    }

    @Override
    public <T> T getEndpointInstance(Class<T> clazz) throws InstantiationException {
        return context.getBean(clazz);
    }
}
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

/**
 * 開啟WebSocket支持
 * @author zhengkai
 */
@Configuration  
public class WebSocketConfig {  
    
    /**
     *  注入對象ServerEndpointExporter,這個bean會自動注冊使用了@ServerEndpoint注解聲明的Websocket endpoint
     * @return
     */
    @Bean  
    public ServerEndpointExporter serverEndpointExporter() {  
        return new ServerEndpointExporter();  
    }  
  
    @Bean
    public MySpringConfigurator getSpringConfigurator(){
        return new MySpringConfigurator();
    }
} 

加上這個對象多個窗口就只能一個窗口收到消息

第三步:前端配置

不帶監聽

var socket;  
if(typeof(WebSocket) == "undefined") {  
    console.log("您的瀏覽器不支持WebSocket");  
}else{  
    console.log("您的瀏覽器支持WebSocket");  
    //實現化WebSocket對象,指定要連接的服務器地址與端口  建立連接  
    //等同於socket = new WebSocket("ws://localhost:8083/checkcentersys/websocket/20"); 
    var wsUrl = $("#url").val();
    console.log("socket 鏈接地址:" + wsUrl);  
    if (wsUrl.indexOf("https") >= 0 ) {//如果是https  webSocket 需要遵守wss協議所以這里判斷如果是https socket
        wsUrl = wsUrl.replace("https","wss");
    }else{
        wsUrl = wsUrl.replace("http","ws");
    }
    console.log("socket 通訊地址:" + wsUrl);  
  //創建鏈接
    function createWebSocket() {
        try {
            ws = new WebSocket(wsUrl);
            // 初始化鏈接
            init();
        } catch(e) {
            console.log('catch'+e);
            reconnect(wsUrl);
        }
    }

    /**
     * 初始化鏈接
     */
    function init() {
        ws.onclose = function () {
            console.log(getNowTime() +" Socket已關閉");  
            reconnect(wsUrl);
        };
        ws.onerror = function() {
            console.log(getNowTime() +' 發生異常了');
            reconnect(wsUrl);
        };
        ws.onopen = function () {
            console.log(getNowTime() +" Socket 已打開");  
            ws.send("連接成功");
            //心跳檢測重置
            heartCheck.start();
        };
        ws.onmessage = function (event) {
            console.log(getNowTime() +' 接收到消息:'+event.data);
            heartCheck.start();
            //拿到任何消息都說明當前連接是正常的
            //實時添加消息
        }
    }

帶心跳監聽

var socket;  
if(typeof(WebSocket) == "undefined") {  
    console.log("您的瀏覽器不支持WebSocket");  
}else{  
    console.log("您的瀏覽器支持WebSocket");  
    //實現化WebSocket對象,指定要連接的服務器地址與端口  建立連接  
    //等同於socket = new WebSocket("ws://localhost:8083/checkcentersys/websocket/20"); 
    var wsUrl = $("#url").val();
    console.log("socket 鏈接地址:" + wsUrl);  
    if (wsUrl.indexOf("https") >= 0 ) {//如果是https  webSocket 需要遵守wss協議所以這里判斷如果是https socket
        wsUrl = wsUrl.replace("https","wss");
    }else{
        wsUrl = wsUrl.replace("http","ws");
    }
    console.log("socket 通訊地址:" + wsUrl);  
    var lockReconnect = false;//避免重復連接
    var ws;
    var tt;
    //創建鏈接
    createWebSocket();
  //創建鏈接
    function createWebSocket() {
        try {
            ws = new WebSocket(wsUrl);
            // 初始化鏈接
            init();
        } catch(e) {
            console.log('catch'+e);
            reconnect(wsUrl);
        }
    }

    /**
     * 初始化鏈接
     */
    function init() {
        ws.onclose = function () {
            console.log(getNowTime() +" Socket已關閉");  
            reconnect(wsUrl);
        };
        ws.onerror = function() {
            console.log(getNowTime() +' 發生異常了');
            reconnect(wsUrl);
        };
        ws.onopen = function () {
            console.log(getNowTime() +" Socket 已打開");  
            ws.send("連接成功");
            //心跳檢測重置
            heartCheck.start();
        };
        ws.onmessage = function (event) {
            console.log(getNowTime() +' 接收到消息:'+event.data);
            heartCheck.start();
            //拿到任何消息都說明當前連接是正常的
            //實時添加消息
        }
    }

    var lockReconnect = false;//避免重復連接
    //重試連接socket
    function reconnect(wsUrl) {
        if(lockReconnect) {
            return;
        };
        lockReconnect = true;
        //沒連接上會一直重連,設置延遲避免請求過多
        tt && clearTimeout(tt);
        tt = setTimeout(function () {
            createWebSocket(wsUrl);
            lockReconnect = false;
        }, 180000);
    }
    //心跳檢測
    var heartCheck = {
        timeout: 210000,
        timeoutObj: null,
        serverTimeoutObj: null,
        start: function(){
              console.log(getNowTime() +" Socket 心跳檢測");  
            var self = this;
            this.timeoutObj && clearTimeout(this.timeoutObj);
            this.serverTimeoutObj && clearTimeout(this.serverTimeoutObj);
            this.timeoutObj = setTimeout(function(){
                //這里發送一個心跳,后端收到后,返回一個心跳消息,
                //onmessage拿到返回的心跳就說明連接正常
                console.log(getNowTime() +' Socket 連接重試');
                ws.send("連接成功");
                self.serverTimeoutObj = setTimeout(function() {
                    console.log(ws);
                    ws.close();
                }, self.timeout);
            }, this.timeout)
        }
    }
}

/**
 * 獲取系統當前時間
 * @returns
 */
function p(s) {
    return s < 10 ? '0' + s : s;
 }
function getNowTime() {
    var myDate = new Date();
    //獲取當前年
    var year = myDate.getFullYear();
    //獲取當前月
    var month = myDate.getMonth() + 1;
    //獲取當前日
    var date = myDate.getDate();
    var h = myDate.getHours();       //獲取當前小時數(0-23)
    var m = myDate.getMinutes();     //獲取當前分鍾數(0-59)
    var s = myDate.getSeconds();
    return year + '-' + p(month) + "-" + p(date) + " " + p(h) + ':' + p(m) + ":" + p(s);
}

第四:nginx配置

https的服務。socket通訊的時候一般情況我們部署的項目設置有超時時間,所以會導致socket連接會關閉,因此我這邊使用前端做了心跳監控,定時發送消息給后端,避免我的socket連接斷開,導致前端不能接收到手段推送的消息

具體配置如下:

    proxy_set_header Upgrade $http_upgrade;    #支持wss
        proxy_set_header Connection "upgrade";    #支持wss
    proxy_redirect off;
    proxy_connect_timeout      240;
    proxy_send_timeout         240;

第五:運行效果

有心跳監聽,無心跳監聽結果大家就自己試哈

 


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