本文主要是介绍webSocket java.io.EOFException: null 增加心跳机制解决,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
最近发现webSocket连接,经常自动断开,看了晚上的一些文章,很多说是Nginx的问题,但是不想改Nginx因为怕影响其他系统,而且不一定有效,因此决定给webSocket加一个心跳机制:
1:先在服务端判断消息是不是心跳检测消息,是的话,原封不动将消息传给客户端即可:
if("heartCheck".equals(jsonObject.getString("heartCheck"))){// 心跳检测的消息sendMessage(message);return;}
前端修改主要参考博客:https://blog.csdn.net/Real_Bird/article/details/77119897
分别在构造方法,onopen,onmessage,onclose三个方法中加上对应的心跳检测逻辑
constructor(props) {super(props);this.state = {user: "",visible: false,messageOn: false,messageCount: null};this.ws = new WebSocket(PATH_WEB_SOCKET + getUserName())// 增加心跳检测--构造方法--startthis.ws.last_health_time = -1; // 上一次心跳时间let thi = this;this.ws.keepalive = function () {let time = new Date().getTime();if (thi.ws.last_health_time !== -1 && time - thi.ws.last_health_time > 200000) { // 不是刚开始连接并且连接大于200sthi.ws.close()} else {// 如果断网了,ws.send会无法发送消息出去。ws.bufferedAmount不会为0。if (thi.ws.bufferedAmount === 0 && thi.ws.readyState === 1) {const sendJson = {heartCheck: 'heartCheck',user: getUserName()};thi.ws.send(JSON.stringify(sendJson));thi.ws.last_health_time = time;}}};// 增加心跳检测--构造方法--endthis.goToPageMessage = this.goToPageMessage.bind(this);this.setIsShown = this.setIsShown.bind(this);this.setIsHide = this.setIsHide.bind(this);}componentDidMount(){// 增加心跳检测--设置变量--startlet reconnect = 0; //重连的时间let reconnectMark = false; //是否重连过this.setState({notificationSocket: true});// 增加心跳检测--设置变量--endthis.setState({messageOn: true,messageCount: 200});this.ws.onopen = ()=>{console.log('web socket 已连接');// 增加心跳检测--onopen--startreconnect = 0;reconnectMark = false;this.ws.receiveMessageTimer = setTimeout(() => {this.ws.close();}, 300000); // 300s没收到信息,代表服务器出问题了,关闭连接。如果收到消息了,重置该定时器。if (this.ws.readyState === 1) { // 为1表示连接处于open状态this.ws.keepAliveTimer = setInterval(() => {this.ws.keepalive();}, 30000) // 30s}// 增加心跳检测--onopen--end};this.ws.onmessage = evt => {// 增加心跳检测--onmessage --startconsole.log("message", evt);const message = JSON.parse(evt.data);//console.log('message', message);if("heartCheck" === message.heartCheck){// 收到的是心跳检测消息}else{// 收到的是业务消息}// 收到消息,重置定时器clearTimeout(this.ws.receiveMessageTimer);this.ws.receiveMessageTimer = setTimeout(() => {this.ws.close();}, 300000); // 300s没收到信息,代表服务器出问题了,关闭连接。// 增加心跳检测--onmessage --end};this.ws.onclose = ()=>{console.log('web socket 已断开链接');// 增加心跳检测--onclose--startclearTimeout(this.ws.receiveMessageTimer);clearInterval(this.ws.keepAliveTimer);if (!reconnectMark) { // 如果没有重连过,进行重连。reconnect = new Date().getTime();reconnectMark = true;}let tempWs = this.ws; // 保存ws对象if (new Date().getTime() - reconnect >= 180000) { // 180秒中重连,连不上就不连了this.ws.close();} else {this.ws = new WebSocket(PATH_WEB_SOCKET + getUserName());this.ws.onopen = tempWs.onopen;this.ws.onmessage = tempWs.onmessage;this.ws.onerror = tempWs.onerror;this.ws.onclose = tempWs.onclose;this.ws.keepalive = tempWs.keepalive;this.ws.last_health_time = -1;}// 增加心跳检测--onclose--end}}
与此同时webSocket还有另外一个问题,也已经解决,请见博客:
The remote endpoint was in state [TEXT_FULL_WRITING] which is an invalid state for called method 已解决
这篇关于webSocket java.io.EOFException: null 增加心跳机制解决的文章就介绍到这儿,希望我们推荐的文章对编程师们有所帮助!