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  • H5 WebSocket Java 前后台代码

    先来个效果

    Java代码

    package hh;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.websocket.Session;
import java.net.InetAddress;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

/**
 * websocket多客户端公共处理类
 * create time:2020-2-10
 */
public class WebSocketUtil {

    protected final static Logger logger = LoggerFactory.getLogger(WebSocketUtil.class);
    private final static String prefix = "WebSocketUtil:";
    public static Map<String,Session> clients = new ConcurrentHashMap<String,Session>();

    /**
     * 客户端连接新增
     * @param host
     * @param session
     */
    public static void add(String host, Session session){
        clients.put(host,session);
        logger.info(prefix+"当前连接客户端host=[{}],连接数量=[{}]",host,clients.size());
    }

    /**
     * 收到客户端消息
     * @param host
     * @param message
     */
    public static void receive(String host, String message) {
        logger.info(prefix+"收到消息 : host=[{}],Message=[{}]",host,message);
        logger.info(prefix+"当前连接数 =[{}]",clients.size());
    }

    /**
     * 移除客户端连接
     * @param host
     */
    public static void remove(String host) {
        clients.remove(host);
        logger.info(prefix+"当前连接数 =[{}]",clients.size());
    }

    /**
     * 给指定的客户端发送消息
     * @param deviceId
     * @param message
     * @return
     */
    public static synchronized  void sendMessage(String deviceId , String message) {
        logger.info(prefix+"当前连接数 =[{}]",clients.size()+"当前设备id为 =[{}]",deviceId+"当前message为 =[{}]",message);
        String host = null;
        synchronized(host){
            clients.get(host).getAsyncRemote().sendText(message);
        }
    }

    public static String getHost() {
        InetAddress ia=null;
        String localname = "",localip = "";
         try {
             ia=ia.getLocalHost();
             localname=ia.getHostName();
             localip=ia.getHostAddress();
             System.out.println("本机名称是："+ localname);
             System.out.println("本机的ip是 ："+localip);
            } catch (Exception e) {
              e.printStackTrace();
            }
         return localip;
    }

}

    前端页面：

    <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<html>

<head>
    <meta>
    <title></title>
    <link rel="stylesheet" type="text/css" href="#springUrl('/static/tv/css/main.css')"/>
    <link rel="stylesheet" type="text/css" href="#springUrl('/static/tv/css/txt.wav.css')"/>
    <link rel="stylesheet" type="text/css" href="#springUrl('/static/tv/css/video.css')"/>
    <link rel="stylesheet" type="text/css" href="#springUrl('/static/tv/css/swiper.min.css')"/>
    <style>
        .swiper-container {
             1215px;
            height: 786px;
            margin-top: 20px;
        }

        .swiper-slide {
            text-align: center;
            font-size: 18px;
            background: #fff;
            display: -webkit-box;
            display: -ms-flexbox;
            display: -webkit-flex;
            display: flex;
            -webkit-box-pack: center;
            -ms-flex-pack: center;
            -webkit-justify-content: center;
            justify-content: center;
            -webkit-box-align: center;
            -ms-flex-align: center;
            -webkit-align-items: center;
            align-items: center;
        }
    </style>
</head>


<!--结算ing-->
<div id="out-1" style="display: none" class="thanks-page cl">
    *##*
    <div class="left-div">
        <img src="#springUrl('/static/tv/img/bg_2.jpg')" style="position: absolute; top: 0;left: 0;"/>
        <div class="img-div">
            <img id="img-O1" src="" class="pic"/>
            <img src="#springUrl('/static/tv/img/img_p.png')" class="img"/>
        </div>
    </div>
    *##*
    <div class="right-div">
        <div class="header cl">
            <div class="logo-div"><img src="#springUrl('/static/tv/img/logo.png')"/></div>
            <div class="right">
                <span>购物详单推送至消息中心</span>
            </div>
        </div>
        <div class="content" style="text-align: center;padding-top: 30px;">
            <div class="adv-img">
                <img id="img-paying-show" src="#springUrl('/static/tv/img/advout.gif')"
                     style=" 600px;height: 600px"/>
                <div style="font-size: 60px;margin-top: 30px;">商品结算中，请稍等……</div>
                <div style="font-size: 40px;color:red;margin-top: 60px;">若您未开通刷脸支付，请打开手机扫码支付哦</div>
                <div style="font-size: 40px;color:red;margin-top: 60px;">支付完成后，别忘记取走您的小票哟~</div>
                <span><audio id="au-I3" src=""></audio></span>
            </div>
        </div>
        <p style="display: none">客服电话：010-57252878</p>
        <!--<div class="content">
            <div class="thanks thanks-top">
                <span>结算中，请稍等~</span>
                <span><audio id="au-O1" src="" style="display: none"></audio></span>
            </div>
            <p style="display: none">客服电话：010-57252878</p>
        </div>-->
    </div>
</div>

<!--结算成功，欢迎再来-->
<div id="out-2" style="display: none" class="thanks-page2 cl">
    *##*
    <div class="left-div">
        <img src="#springUrl('/static/tv/img/bg_2.jpg')" style="position: absolute; top: 0;left: 0;"/>
        <div class="img-div">
            <img id="img-O2" src="" class="pic"/>
            <img src="#springUrl('/static/tv/img/img_p.png')" class="img"/>
        </div>
    </div>
    *##*
    <div class="right-div">
        <div class="header cl">
            <div class="logo-div"><img src="#springUrl('/static/tv/img/logo.png')"/></div>
            <div class="right">
                <span>购物详单推送至消息中心</span>
            </div>
        </div>
        <div class="content">
            <div class="thanks">
                <span>支付成功&nbsp;&nbsp;欢迎再来~</span>
                <span style="margin-top:5%; ">请取走您的小票</span>
                <span><audio id="au-O2" src=""></audio></span>
                <span><audio id="au-O8" src=""></audio></span>
                <span><audio id="au-O11" src=""></audio></span>
                <span><audio id="au-O12" src=""></audio></span>
            </div>

            <p>客服电话：010-57252878</p>
        </div>
    </div>
</div>

<!--未购物，欢迎再来-->
<div id="out-3" style="display: none" class="thanks-page">
    *##*
    <div class="left-div">
        <img src="#springUrl('/static/tv/img/bg_2.jpg')" style="position: absolute; top: 0;left: 0;"/>
        <div class="img-div">
            <img id="img-O3" src="" class="pic"/>
            <img src="#springUrl('/static/tv/img/img_p.png')" class="img"/>
        </div>
    </div>
    *##*
    <div class="right-div">
        <div class="header cl">
            <div class="logo-div"><img src="#springUrl('/static/tv/img/logo.png')"/></div>
            <div class="right">
                <span>购物详单推送至消息中心</span>
            </div>
        </div>
        <div class="content">
            <div class="thanks">
                <span>谢谢惠顾&nbsp;&nbsp;欢迎再来~</span>
                <span><audio id="au-O3" src=""></audio></span>
            </div>
            <p>客服电话：010-57252878</p>
        </div>
    </div>
</div>

<!--余额不足-->
<div id="out-4" style="display: none" class="insufficient-page">
    *##*
    <div class="left-div">
        <img src="#springUrl('/static/tv/img/bg_2.jpg')" style="position: absolute; top: 0;left: 0;"/>
        <div class="img-div">
            <img id="img-O4" src="" class="pic"/>
            <img src="#springUrl('/static/tv/img/img_p.png')" class="img"/>
        </div>
    </div>
    *##*
    <div class="right-div">
        <div class="header cl">
            <div class="logo-div"><img src="#springUrl('/static/tv/img/logo.png')"/></div>
            <div class="right">
                <span>购物详单推送至消息中心</span>
            </div>
        </div>
        <div class="content">
            <div class="insufficient">
                <div class="disc">
                    <!--<p>钱包余额不足...</p>
                    <p>请扫码支付</p>-->
                    <p>请您扫码支付...</p>
                    <!--<span><audio id="au-O4" src=""></audio></span>-->
                    <!--<span><audio id="au-O14" src=""></audio></span>-->
                    <!--<span><audio id="au-O15" src=""></audio></span>-->
                </div>
            </div>
        </div>
        <div class="list-bottom cl">
            <div class="bot-right">
                <p class="p2" id="showInc4"><span>优惠：</span><span id="ins4cash"></span></p>
                <p class="p3">总价：<span id="ins4total"></span></p>
            </div>
        </div>
    </div>
</div>

<!--超出限额-->
<div id="out-5" style="display: none" class="limit-page">
    *##*
    <div class="left-div">
        <img src="#springUrl('/static/tv/img/bg_2.jpg')" style="position: absolute; top: 0;left: 0;"/>
        <div class="img-div">
            <img id="img-O5" src="" class="pic"/>
            <img src="#springUrl('/static/tv/img/img_p.png')" class="img"/>
        </div>
    </div>
    *##*
    <div class="right-div">
        <div class="header cl">
            <div class="logo-div"><img src="#springUrl('/static/tv/img/logo.png')"/></div>
            <div class="right">
                <span>购物详单推送至消息中心</span>
            </div>
        </div>
        <div class="content">
            <div class="limit">
                <div class="disc">
                    <p>超过免支付限额...</p>
                    <p>稍后请扫码支付</p>
                    <span><audio id="au-O5" src=""></audio></span>
                </div>
            </div>
        </div>
        <div class="bottom">
                        <span>
                    客服电话：010-57252878
                </span>
        </div>
    </div>
</div>

<!--支付未成功-->
<div id="out-6" style="display: none" class="lose-page">
    *##*
    <div class="left-div">
        <img src="#springUrl('/static/tv/img/bg_2.jpg')" style="position: absolute; top: 0;left: 0;"/>
        <div class="img-div">
            <img id="img-O6" src="" class="pic"/>
            <img src="#springUrl('/static/tv/img/img_p.png')" class="img"/>
        </div>
    </div>
    *##*
    <div class="right-div">
        <div class="header cl">
            <div class="logo-div"><img src="#springUrl('/static/tv/img/logo.png')"/></div>
            <div class="right">
                <span>购物详单推送至消息中心</span>
            </div>
        </div>
        <div class="content">
            <div class="lose">
                <div class="disc">
                    <p>支付未成功...</p>
                    <p>请按紧急按钮按返回超市内，重新结算</p>
                    <span><audio id="au-O6" src=""></audio></span>
                    <span><audio id="au-O13" src=""></audio></span>
                </div>
            </div>
        </div>
        <div class="bottom">
                        <span>
                    客服电话：010-57252878
                </span>
        </div>
    </div>
</div>

<!--购物清单-->
<div id="out-7" style="display: none" class="list-page cl">
    *##*
    <div class="left-div">
        <img src="#springUrl('/static/tv/img/bg_2.jpg')" style="position: absolute; top: 0;left: 0;"/>
        <div class="img-div">
            <img id="img-O7" src="" class="pic"/>
            <img src="#springUrl('/static/tv/img/img_p.png')" class="img"/>
        </div>
    </div>
    *##*
    <div class="right-div">
        <div class="header cl">
            <div class="logo-div"><img src="#springUrl('/static/tv/img/logo.png')"/></div>
            <div class="right">
                <span>购物详单推送至消息中心</span>
            </div>
        </div>
        <div class="content">
            <div class="list">
                <div class="t-head"><span id="goodsTotalNum"></span><span>数量</span><span>金额</span></div>
                <div class="renav">
                    <ul id="goodsInfo">

                    </ul>
                </div>
            </div>
        </div>
        <div class="list-bottom cl">
            <div class="bot-right">
                <p class="p2" id="detailinc"><span>优惠：</span><span id="inc_amount"></span></p>
                <p class="p3">总价：<span id="total_cash"></span></p>
                <!-- 微信支付门店放开注释 下面两个图片二选一
                <img src="img/jd.png" id="jdjr" style="display: none"/>
                <img src="img/wx.png" id="wechat" style="display: none"/>-->
            </div>
        </div>
    </div>
</div>

<!--扫码支付-->
<div id="out-8" style="display: none" class="paycode-page">
    *##*
    <div class="left-div">
        <img src="#springUrl('/static/tv/img/bg_2.jpg')" style="position: absolute; top: 0;left: 0;"/>
        <div class="img-div">
            <img id="img-O8" src="" class="pic"/>
            <img src="#springUrl('/static/tv/img/img_p.png')" class="img"/>
        </div>
    </div>
    *##*
    <div class="right-div">
        <div class="header cl">
            <div class="logo-div"><img src="#springUrl('/static/tv/img/logo.png')"/></div>
            <div class="right">
                <span>购物详单推送至消息中心</span>
            </div>
        </div>
        <div class="content">
            <div class="insufficient">
                <div class="disc">
                    <p class="p3">订单商品总数：<span id="totalCountSpan"></span>件</p>
                    <p>请扫码支付<span id="timeLeave" style="color: #d9271e;margin-left: 30px;font-weight: 500;"></span>秒</p>
                    <span><audio id="au-O4" src=""></audio></span>
                    <span><audio id="au-O14" src=""></audio></span>
                    <span><audio id="au-O15" src=""></audio></span>
                    <div class="code cl">
                        <!-- <dl>
                            <dt><div id="genCodeJdjr"></div></dt>
                            <dd><img src="img/jd.png"/><span>京东金融</span></dd>
                        </dl> -->
                        <dl>
                            <dt>
                                <div id="genCodeWechat"></div>
                                <!--<img id="genCodeWechat" src=""/>-->
                            </dt>
                            <!--微信支付门店有<span>微信支付</span>-->
                            <dd><img src="#springUrl('/static/tv/img/wx.png')"/></dd>
                        </dl>
                    </div>
                </div>
            </div>
        </div>
        <div id="divOne" style="display: none;"></div>
        <div id="divTwo" style="display: none;"></div>
        <div class="list-bottom cl">
            <div class="bot-right">
                <p class="p2" id="showInc"><span>优惠：</span><span id="incAmount"></span></p>
                <p class="p3">总价：<span id="payPrice"></span></p>
            </div>
        </div>
    </div>
</div>


<!--结算时未识别人脸-->
<div id="out-10" style="display: none" class="lose-page">
    *##*
    <div class="left-div">
        <img src="#springUrl('/static/tv/img/bg_2.jpg')" style="position: absolute; top: 0;left: 0;"/>
        <div class="img-div">
            <img src="" class="pic"/>
            <img src="#springUrl('/static/tv/img/img_p.png')" class="img"/>
        </div>
    </div>
    *##*
    <div class="right-div">
        <div class="header cl">
            <div class="logo-div"><img src="#springUrl('/static/tv/img/logo.png')"/></div>
            <div class="right">
                <span>购物详单推送至消息中心</span>
            </div>
        </div>
        <div class="content">
            <div class="lose">
                <div class="disc">
                    <p>未识别到面部信息...</p>
                    <p>请按紧急按钮按返回超市内，重新结算</p>
                    <span><audio id="au-O10" src=""></audio></span>
                </div>
            </div>
        </div>
        <div class="bottom">
                        <span>
                    客服电话：010-57252878
                </span>
        </div>
    </div>
</div>

<!--抱歉客官-->
<div id="out-13" style="display: none" class="thanks-page cl">
    *##*
    <div class="left-div">
        <img src="#springUrl('/static/tv/img/bg_2.jpg')" style="position: absolute; top: 0;left: 0;"/>
        <div class="img-div">
            <img id="img-O13" src="" class="pic"/>
            <img src="#springUrl('/static/tv/img/img_p.png')" class="img"/>
        </div>
    </div>
    *##*
    <div class="right-div">
        <div class="header cl">
            <div class="logo-div"><img src="#springUrl('/static/tv/img/logo.png')"/></div>
            <div class="right">
                <span>购物详单推送至消息中心</span>
            </div>
        </div>
        <div class="content">
            <div class="wrap">
                <div class="sorry">
                    <h1>抱歉客官</h1>

                    <h3>暂时无法结算，麻烦退回店内～非常抱歉！</h3>
                </div>
            </div>
            <p>客服电话：010-57252878</p>
        </div>
    </div>
</div>

</div>
<script src="#springUrl('/static/tv/js/jquery-3.1.1.js')" type="text/javascript" charset="utf-8"></script>
<script src="#springUrl('/static/tv/js/swiper.min.js')" type="text/javascript" charset="utf-8"></script>
<script src="#springUrl('/static/tv/js/exit.js')" type="text/javascript" charset="utf-8"></script>
<script src="#springUrl('/static/tv/js/txt.wav.js')" type="text/javascript" charset="utf-8"></script>
<script src="#springUrl('/static/tv/js/video.js')" type="text/javascript" charset="utf-8"></script>
<script src="#springUrl('/static/tv/js/reconnecting-websocket.min.js')" type="text/javascript" charset="utf-8"></script>
<script src="#springUrl('/static/tv/js/tvconfig.js')" type="text/javascript" charset="utf-8"></script>
<script src="#springUrl('/static/tv/js/qrcode.js')" type="text/javascript" charset="utf-8"></script>
</body>
</html>
*#

<!DOCTYPE html>
<html>
<head>
    <title>Java后端WebSocket的Tomcat实现</title>
</head>
<body>
Welcome<br/><input id="text" type="text"/>
<button onclick="send()">发送消息</button>
<hr/>
<button onclick="closeWebSocket()">关闭WebSocket连接</button>
<hr/>
<div id="message"></div>
</body>

<script type="text/javascript">
    var websocket = null;
    //判断当前浏览器是否支持WebSocket
    if ('WebSocket' in window) {
        websocket = new WebSocket("ws://localhost:8080/tvOut/websocket");
    }
    else {
        alert('当前浏览器 Not support websocket')
    }

    //连接发生错误的回调方法
    websocket.onerror = function () {
        setMessageInnerHTML("WebSocket连接发生错误");
    };

    //连接成功建立的回调方法
    websocket.onopen = function () {
        setMessageInnerHTML("WebSocket连接成功");
    }
    //接收到消息的回调方法
    websocket.onmessage = function (event) {
        setMessageInnerHTML(event.data);
    }

    //连接关闭的回调方法
    websocket.onclose = function () {
        setMessageInnerHTML("WebSocket连接关闭");
    }

    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function () {
        closeWebSocket();
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭WebSocket连接
    function closeWebSocket() {
        websocket.close();
    }

    //发送消息
    function send() {
        var message = document.getElementById('text').value;
        websocket.send(message);
    }
</script>
</html>

    简版前端

    <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Java后端WebSocket的Tomcat实现</title>
    <script type="text/javascript">
        var websocket = null;
        //判断当前浏览器是否支持WebSocket
        if ('WebSocket' in window) {
            websocket = new WebSocket("ws://localhost:8080/tvOut/websocket");
        }
        else {
            alert('当前浏览器 Not support websocket')
        }

        //连接发生错误的回调方法
        websocket.onerror = function () {
            setMessageInnerHTML("WebSocket连接发生错误");
        };

        //连接成功建立的回调方法
        websocket.onopen = function () {
            setMessageInnerHTML("WebSocket连接成功");
        }
        //接收到消息的回调方法
        websocket.onmessage = function (event) {
            setMessageInnerHTML(event.data);
        }

        //连接关闭的回调方法
        websocket.onclose = function () {
            setMessageInnerHTML("WebSocket连接关闭");
        }

        //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
        window.onbeforeunload = function () {
            closeWebSocket();
        }

        //将消息显示在网页上
        function setMessageInnerHTML(innerHTML) {
            document.getElementById('message').innerHTML += innerHTML + '<br/>';
        }

        //关闭WebSocket连接
        function closeWebSocket() {
            websocket.close();
        }

        //发送消息
        function send() {
            var message = document.getElementById('text').value;
            websocket.send(message);
        }
    </script>
</head>
<body>
Welcome<br/><input id="text" type="text"/>
<button onclick="send()">发送消息</button>
<hr/>
<button onclick="closeWebSocket()">关闭WebSocket连接</button>
<hr/>
<div id="message"></div>
</body>
</html>

    pom文件

    <?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>h5websocket</groupId>
    <artifactId>web</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>web Maven Webapp</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.websocket</groupId>
            <artifactId>javax.websocket-api</artifactId>
            <version>1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.25</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.25</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.7.25</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <finalName>web</finalName>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.22.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>3.2.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

    亲测可用，如果出现链接失败，多数问题为链接的ip或者端口没有和后台对应上，对应上就可以了
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  • 原文地址：https://www.cnblogs.com/honghong75042/p/12615075.html
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