webscoket

加pom依赖，新建模块：spring-boot-websocker

image

1.1.加依赖：

<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>
<dependency>
   <groupId>org.projectlombok</groupId>
   <artifactId>lombok</artifactId>
   <version>1.18.6<version>
   <optional>true</optional>
</dependency>
<dependency>
   <groupId>com.spring4all</groupId>
   <artifactId>swagger-spring-boot-starter</artifactId>
   <version>1.8.0.RELEASE<version>
</dependency>

• WebSocketConfig类

package com.springboot.websocker.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();
    }

}

• WebSocketServer类

package com.springboot.websocker.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--;
    }
}

• WebSocketController类

package com.springboot.websocker.controller;

import com.springboot.websocker.config.WebSocketServer;
import org.springframework.web.bind.annotation.GetMapping;

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";
    }
}

底层统统不要捕获异常，所有的异常在controller捕获异常
create和onload只执行一次
前端代码：

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8" />
        <link rel="stylesheet" type="text/css" href="css/font-awesome.min.css" />
        <meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no">
        <meta name="viewport" content="width=device-width,initial-scale=1,maximun-scale=1">
        <!-- Edge模式通知 Windows Internet Explorer 以最高级别的可用模式显示内容 -->
        <meta http-equiv="X-UA-Compatible" content="ie=edge">
        <title>websocket示例</title>
        <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
        <style type="text/css">
        /* 手机 */
        @media only screen and (min-width : 320px) {
            .col-xs-12{
                flex: 0 0 100%;
            }
        }
                /* 平板 */
        @media only screen and (min-width : 768px) {
            .col-md-6{
                flex: 0 0 50%;
            }
        }
        /* 中等屏幕 */
        @media only screen and (min-width : 992px) {
            .col-lg-4{
                flex: 0 0 33.33%;
            }
        }
        /* 宽屏设备 */
        @media only screen and (min-width : 1200px) {
            .col-xl-3{
                flex: 0 0 25%;
            }
        }
        body{
            background: url(img/20190414131210.png);
        }
        .header{
            right: 5px;
            left: 1px;
            position: fixed;
            top: 0;
            width: 100%;
            height: 40px;
            background-color:rgb(70,154,254);
            display:flex;
            justify-content: space-between;
        }
        .header img{
            padding: 10upx;
            width: 25px;
            height: 25px;
        }
        .foot{
            margin-top: 400px;
        }
        .foots{
            height: 40px;
            width: 100%;
            right: 5px;
            left: 3px;
            position: absolute;
            background-color:rgb(70,154,254);
        }
        .foots img{
            width: 30px;
            height: 30px;
            padding: 12px;
        }
        </style>
    </head>
    <body>
        <div id="app">
            <div class="header">
                <div><img src="img/xiaoyuhao.png"/></div>
                <div>
                    <img src="img/phone.png"/>
                    <img src="img/people.png"/>
                </div>
            </div>
            <div id="box">
                <div id="pic">
                    <h3>消息显示</h3>
                    <ul>
                        <li v-for="(message, index) in messages" :key="index">
                            {{message}}
                        </li>
                    </ul>
                </div>
            </div>

            <div class="foot">
                <!-- <h3>发送消息 </h3> -->
                <input type="text" v-model="sendMsg" />
                <button type="button" @click="send">发送</button>
            </div>
            <div class="foots">
                <img src="img/voi.png"/>
                <img src="img/ablum.png"/>
                <img src="img/money.png"/>
                <img src="img/shipin.png"/>
                <img src="img/xiaolian.png"/>
            </div>
        </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://192.168.43.83:8080/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;
                    },
                },
                methods: {
                    send: function() {
                        socket.send(this.sendMsg);
                    }
                }
            })
        </script>
    </body>
</html>