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Websocket练习

Websocket练习

作者: 国王兔子 | 来源:发表于2019-04-17 19:48 被阅读0次

    新建模块spring-boot-websocket

    添加pom依赖

    <dependency>
                <groupId>com.spring4all</groupId>
                <artifactId>swagger-spring-boot-starter</artifactId>
                <version>1.8.0.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-websocket</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
    • 项目结构


      image.png
    • WebSocketSeriver
    package com.boot.websocket.config;
    
    import org.springframework.stereotype.Component;
    
    import javax.websocket.*;
    import javax.websocket.server.ServerEndpoint;
    import java.io.IOException;
    import java.util.concurrent.CopyOnWriteArraySet;
    
    //客户端向服务器端建立WebSocket连接的url
    @ServerEndpoint("/websocket")
    @Component
    public class WebSocketServer {
    
        //静态变量,用来记录当前在线连接数,可选
        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,必须
        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,必须
        private Session session;
    
    
        /**
         * 连接建立成功调用的方法
         */
        @OnOpen
        public void onOpen(Session session) {
            this.session = session;
            webSocketSet.add(this);     //将客户端加入set中
            addOnlineCount();           //在线数加1
            System.out.println("有新窗口开始监听,当前在线人数为"
                    + getOnlineCount());
            try {
                sendMessage("连接成功");
            } catch (IOException e) {
                System.out.println("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
            System.out.println("有连接关闭!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) {
            System.out.println("收到客户端的信息:" + 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) {
            System.out.println("发生错误");
            error.printStackTrace();
        }
    
        /**
         * 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) throws IOException {
            System.out.println("推送消息内容:" + message);
            for (WebSocketServer item : webSocketSet) {
                try {
                    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--;
        }
    }
    
    • WebSocketConfig类
    package com.boot.websocket.config;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.socket.server.standard.ServerEndpointExporter;
    
    /**
     * WebSocket的配置类
     * 开启了WebSocket支持
     */
    @Configuration
    public class WebSocketConfig {
    
        @Bean
        public ServerEndpointExporter serverEndpointExporter() {
            return new ServerEndpointExporter();
        }
    
    }
    
    
    • WebSocketController
    package com.boot.websocket.controller;
    
    import com.boot.websocket.config.WebSocketServer;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import java.io.IOException;
    
    @RestController
    public class WebSocketController {
    
        //推送数据接口
        @GetMapping("/socket/push")
        public String pushMsg(String message) {
            try {
                WebSocketServer.sendInfo(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
            return "success";
        }
    }
    

    运行主类,打开swagger文档

    前端

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="utf-8" />
            <title>websocket示例</title>
            <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"/>
            <meta http-equiv="description" content="this is my page"/>
            <meta http-equiv="content-type" content="text/html; charset=GBK"/>
            <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
            
        </head>
        <body>
             <script src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
            <div id="app">
                <h3>消息显示</h3>
                <ul>
                    <li v-for="(message, index) in messages" :key="index">
                        {{message}}
                    </li>
                </ul>
                <hr>
                <h3>发送消息 </h3>
                <input type="text" v-model="sendMsg" />
                <button type="button" @click="send" onclick="showNotification()">发送</button>
                 
            </div>
            <script type="text/javascript">
                var socket;
                var app = new Vue({
                    el: '#app',
                    data: {
                        messages: [],
                        sendMsg: ''
                    },
                    created: function() {
                        var _this = this;
                        //创建WebSocket对象,指定要连接的服务器地址和端口,建立连接
                        socket = new WebSocket("ws://localhost:8080/websocket");
                        //打开连接
                        socket.onopen = function() {
                            console.log("Socket已打开");
    
                        };
                        //获得服务端推送的消息
                        socket.onmessage = function(msg) {
                            console.log(msg.data);
                            _this.messages.push(msg.data);
                            console.log(_this.messages);
                        };
                        //关闭连接
                        socket.onclose = function() {
                            console.log("Socket已关闭");
                        };
                        //发送错误
                        socket.onerror = function() {
                            alert("Socket发生了错误");
                        }
                    },
                    watch: {
                        // 如果 `messages` 发生改变,这个函数就会运行
                        messages: function(newMsg, oldMsg) {
                            this.messages = newMsg;
                            var n =new Notification('你有一条新消息',{
                                body:newMsg[newMsg.length - 1],
                                icon:"img/img4.jpg"
                                });
                                setTimeout(function(){
                                    n.close();
                                },4000);
                        },
                    },
                    methods: {
                        send: function() {
                            socket.send(this.sendMsg);
                        }
                    }
                })
      function showNotification() {
                    window.Notification.permission = "granted";
                    if(window.Notification) {
                        if(window.Notification.permission == "granted") {
                            var notification = new Notification('你有一条新信息', {
                                body:newMsg[newMsg.length - 1],
                                icon: "img/img4.jpg"
                            });
                            setTimeout(function() { notification.close(); }, 5000);
                        } else {
                            window.Notification.requestPermission();
                        }
                    } else alert('你的浏览器不支持此消息提示功能,请使用chrome内核的浏览器!');
                };
            </script>
        </body>
    </html>
    
    
    运行结果

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