第一:引入jar
由于项目是springboot的项目所以我这边简单的应用了springboot自带的socket jar
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-websocket</artifactId> </dependency>
第二:Socket代码编写
import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.socket.server.standard.ServerEndpointExporter; /** * 开启WebSocket支持 */ @Configuration public class WebSocketConfig { /** * 注入对象ServerEndpointExporter,这个bean会自动注册使用了@ServerEndpoint注解声明的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; /**
* 发送消息的类
*/ @Slf4j @Component @ServerEndpoint(value = "/websocket/{sid}") public class WebSocketServer { //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 int onlineCount = 0; //concurrent包的线程安全Set,用来存放每个客户端对应的MyWebSocket对象。 private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>(); //与某个客户端的连接会话,需要通过它来给客户端发送数据 private Session session; //接收sid private String sid=""; /** * 连接建立成功调用的方法*/ @OnOpen public void onOpen(Session session,@PathParam("sid") String sid) { this.session = session; webSocketSet.add(this); //加入set中 addOnlineCount(); //在线数加1 log.info("有新窗口开始监听:"+sid+",当前在线人数为" + getOnlineCount()); this.sid=sid; try { sendMessage("连接成功"); } catch (IOException e) { log.error("websocket IO异常"); } } /** * 连接关闭调用的方法 */ @OnClose public void onClose() { webSocketSet.remove(this); //从set中删除 subOnlineCount(); //在线数减1 log.info("有一连接关闭!当前在线人数为" + getOnlineCount()); } /** * 收到客户端消息后调用的方法 * * @param message 客户端发送过来的消息*/ @OnMessage public void onMessage(String message, Session session) { log.info("收到来自窗口"+sid+"的信息:"+message); //群发消息 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("非正常关闭,发生错误!====>" + error.toString() + "当前在线人数为" + getOnlineCount()); } /** * 实现服务器主动推送 */ public void sendMessage(String message) throws IOException { this.session.getBasicRemote().sendText(message); } /** * 群发自定义消息 * */ public static void sendInfo(String message,@PathParam("sid") String sid) throws IOException { log.info("推送消息到窗口"+sid+",推送内容:"+message); for (WebSocketServer item : webSocketSet) { try { //这里可以设定只推送给这个sid的,为null则全部推送 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--; } }
发送消息调用 try { WebSocketServer.sendInfo("自定义需要推送的消息" ,"111"); } catch (IOException e) { e.printStackTrace(); }
上述代码在发送消息时,可以支持一条消息对应多个窗口
如果想要使用一个消息值推送到一个窗口,就使用一下springboot的管理
具体实现:
添加一个管理的类
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; /** * 开启WebSocket支持 * @author zhengkai */ @Configuration public class WebSocketConfig { /** * 注入对象ServerEndpointExporter,这个bean会自动注册使用了@ServerEndpoint注解声明的Websocket endpoint * @return */ @Bean public ServerEndpointExporter serverEndpointExporter() { return new ServerEndpointExporter(); } @Bean public MySpringConfigurator getSpringConfigurator(){ return new MySpringConfigurator(); } }
加上这个对象多个窗口就只能一个窗口收到消息
第三步:前端配置
不带监听
var socket; if(typeof(WebSocket) == "undefined") { console.log("您的浏览器不支持WebSocket"); }else{ console.log("您的浏览器支持WebSocket"); //实现化WebSocket对象,指定要连接的服务器地址与端口 建立连接 //等同于socket = new WebSocket("ws://localhost:8083/checkcentersys/websocket/20"); var wsUrl = $("#url").val(); console.log("socket 链接地址:" + wsUrl); if (wsUrl.indexOf("https") >= 0 ) {//如果是https webSocket 需要遵守wss协议所以这里判断如果是https socket wsUrl = wsUrl.replace("https","wss"); }else{ wsUrl = wsUrl.replace("http","ws"); } console.log("socket 通讯地址:" + wsUrl); //创建链接 function createWebSocket() { try { ws = new WebSocket(wsUrl); // 初始化链接 init(); } catch(e) { console.log('catch'+e); reconnect(wsUrl); } } /** * 初始化链接 */ function init() { ws.onclose = function () { console.log(getNowTime() +" Socket已关闭"); reconnect(wsUrl); }; ws.onerror = function() { console.log(getNowTime() +' 发生异常了'); reconnect(wsUrl); }; ws.onopen = function () { console.log(getNowTime() +" Socket 已打开"); ws.send("连接成功"); //心跳检测重置 heartCheck.start(); }; ws.onmessage = function (event) { console.log(getNowTime() +' 接收到消息:'+event.data); heartCheck.start(); //拿到任何消息都说明当前连接是正常的 //实时添加消息 } }
带心跳监听
var socket; if(typeof(WebSocket) == "undefined") { console.log("您的浏览器不支持WebSocket"); }else{ console.log("您的浏览器支持WebSocket"); //实现化WebSocket对象,指定要连接的服务器地址与端口 建立连接 //等同于socket = new WebSocket("ws://localhost:8083/checkcentersys/websocket/20"); var wsUrl = $("#url").val(); console.log("socket 链接地址:" + wsUrl); if (wsUrl.indexOf("https") >= 0 ) {//如果是https webSocket 需要遵守wss协议所以这里判断如果是https socket wsUrl = wsUrl.replace("https","wss"); }else{ wsUrl = wsUrl.replace("http","ws"); } console.log("socket 通讯地址:" + wsUrl); var lockReconnect = false;//避免重复连接 var ws; var tt; //创建链接 createWebSocket(); //创建链接 function createWebSocket() { try { ws = new WebSocket(wsUrl); // 初始化链接 init(); } catch(e) { console.log('catch'+e); reconnect(wsUrl); } } /** * 初始化链接 */ function init() { ws.onclose = function () { console.log(getNowTime() +" Socket已关闭"); reconnect(wsUrl); }; ws.onerror = function() { console.log(getNowTime() +' 发生异常了'); reconnect(wsUrl); }; ws.onopen = function () { console.log(getNowTime() +" Socket 已打开"); ws.send("连接成功"); //心跳检测重置 heartCheck.start(); }; ws.onmessage = function (event) { console.log(getNowTime() +' 接收到消息:'+event.data); heartCheck.start(); //拿到任何消息都说明当前连接是正常的 //实时添加消息 } } var lockReconnect = false;//避免重复连接 //重试连接socket function reconnect(wsUrl) { if(lockReconnect) { return; }; lockReconnect = true; //没连接上会一直重连,设置延迟避免请求过多 tt && clearTimeout(tt); tt = setTimeout(function () { createWebSocket(wsUrl); lockReconnect = false; }, 180000); } //心跳检测 var heartCheck = { timeout: 210000, timeoutObj: null, serverTimeoutObj: null, start: function(){ console.log(getNowTime() +" Socket 心跳检测"); var self = this; this.timeoutObj && clearTimeout(this.timeoutObj); this.serverTimeoutObj && clearTimeout(this.serverTimeoutObj); this.timeoutObj = setTimeout(function(){ //这里发送一个心跳,后端收到后,返回一个心跳消息, //onmessage拿到返回的心跳就说明连接正常 console.log(getNowTime() +' Socket 连接重试'); ws.send("连接成功"); self.serverTimeoutObj = setTimeout(function() { console.log(ws); ws.close(); }, self.timeout); }, this.timeout) } } } /** * 获取系统当前时间 * @returns */ function p(s) { return s < 10 ? '0' + s : s; } function getNowTime() { var myDate = new Date(); //获取当前年 var year = myDate.getFullYear(); //获取当前月 var month = myDate.getMonth() + 1; //获取当前日 var date = myDate.getDate(); var h = myDate.getHours(); //获取当前小时数(0-23) var m = myDate.getMinutes(); //获取当前分钟数(0-59) var s = myDate.getSeconds(); return year + '-' + p(month) + "-" + p(date) + " " + p(h) + ':' + p(m) + ":" + p(s); }
第四:nginx配置
https的服务。socket通讯的时候一般情况我们部署的项目设置有超时时间,所以会导致socket连接会关闭,因此我这边使用前端做了心跳监控,定时发送消息给后端,避免我的socket连接断开,导致前端不能接收到手段推送的消息
具体配置如下:
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:运行效果
有心跳监听,无心跳监听结果大家就自己试哈