本篇内容：

后端 + 前端简单HTML页面

功能场景点：

1. 群发，所有人都能收到

2. 局部群发，部分人群都能收到

3. 单点推送，指定某个人的页面

惯例，先看看本次实战示例项目结构：

可以看到内容不多，也就是说，springboot 整合socket，跟着我学，轻轻松松。

古有曹植七步成诗,如今，咱们也是 7步学会整合socket！

不多说，开始：

① pom引入核心依赖

<dependencies>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.75</version>
        </dependency>
        <dependency>
            <groupId>com.corundumstudio.socketio</groupId>
            <artifactId>netty-socketio</artifactId>
            <version>1.7.7</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

② yml加上配置项

server:
  port: 8089
socketio:
   host: localhost
   port: 8503
   maxFramePayloadLength: 1048576
   maxHttpContentLength: 1048576
   bossCount: 1
   workCount: 100
   allowCustomRequests: true
   upgradeTimeout: 10000
   pingTimeout: 60000
   pingInterval: 25000

③ 创建socket配置加载类 MySocketConfig.java

import com.corundumstudio.socketio.SocketConfig;
import com.corundumstudio.socketio.SocketIOServer;
import com.corundumstudio.socketio.annotation.SpringAnnotationScanner;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
 * @Author: JCccc
 * @Description:
 * @Date: 2022/06/13 21:50
 */
@Configuration
public class MySocketConfig{
    @Value("${socketio.host}")
    private String host;
    @Value("${socketio.port}")
    private Integer port;
    @Value("${socketio.bossCount}")
    private int bossCount;
    @Value("${socketio.workCount}")
    private int workCount;
    @Value("${socketio.allowCustomRequests}")
    private boolean allowCustomRequests;
    @Value("${socketio.upgradeTimeout}")
    private int upgradeTimeout;
    @Value("${socketio.pingTimeout}")
    private int pingTimeout;
    @Value("${socketio.pingInterval}")
    private int pingInterval;
    @Bean
    public SocketIOServer socketIOServer() {
        SocketConfig socketConfig = new SocketConfig();
        socketConfig.setTcpNoDelay(true);
        socketConfig.setSoLinger(0);
        com.corundumstudio.socketio.Configuration config = new com.corundumstudio.socketio.Configuration();
        buildSocketConfig(socketConfig, config);
        return new SocketIOServer(config);
    }
    /**
     * 扫描netty-socketIo的注解( @OnConnect、@OnEvent等）
     */
    @Bean
    public SpringAnnotationScanner springAnnotationScanner() {
        return new SpringAnnotationScanner(socketIOServer());
    }
    private void buildSocketConfig(SocketConfig socketConfig, com.corundumstudio.socketio.Configuration config) {
        config.setSocketConfig(socketConfig);
        config.setHostname(host);
        config.setPort(port);
        config.setBossThreads(bossCount);
        config.setWorkerThreads(workCount);
        config.setAllowCustomRequests(allowCustomRequests);
        config.setUpgradeTimeout(upgradeTimeout);
        config.setPingTimeout(pingTimeout);
        config.setPingInterval(pingInterval);
    }
}

④创建消息实体 MyMessage.java

/**
 * @Author: JCccc
 * @Date: 2022-07-23 9:05
 * @Description:
 */
public class MyMessage {
    private String type;
    private String content;
    private String from;
    private String to;
    private String channel;
    public String getType() {
        return type;
    }
    public void setType(String type) {
        this.type = type;
    }
    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content;
    }
    public String getFrom() {
        return from;
    }
    public void setFrom(String from) {
        this.from = from;
    }
    public String getTo() {
        return to;
    }
    public void setTo(String to) {
        this.to = to;
    }
    public String getChannel() {
        return channel;
    }
    public void setChannel(String channel) {
        this.channel = channel;
    }
}

代码简析：

⑤创建 socket handler 负责记录客户端连接、下线

MySocketHandler.java

import com.corundumstudio.socketio.SocketIOClient;
import com.corundumstudio.socketio.SocketIOServer;
import com.corundumstudio.socketio.annotation.OnConnect;
import com.corundumstudio.socketio.annotation.OnDisconnect;
import com.socket.mysocket.util.SocketUtil;
import org.springframework.beans.factory.annotation.Autowired;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
/**
 * @Author: JCccc
 * @Description:
 * @Date: 2022/6/23 21:21
 */
@Component
public class MySocketHandler {
    private final Logger log = LoggerFactory.getLogger(this.getClass());
    @Autowired
    private SocketIOServer socketIoServer;
    @PostConstruct
    private void start(){
        try {
            socketIoServer.start();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
    @PreDestroy
    private void destroy(){
        try {
        socketIoServer.stop();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
    @OnConnect
    public void connect(SocketIOClient client) {
        String userFlag = client.getHandshakeData().getSingleUrlParam("userFlag");
        SocketUtil.connectMap.put(userFlag, client);
        log.info("客户端userFlag: "+ userFlag+ "已连接");
    }
    @OnDisconnect
    public void onDisconnect(SocketIOClient client) {
        String userFlag = client.getHandshakeData().getSingleUrlParam("userFlag");
        log.info("客户端userFlag:" + userFlag + "断开连接");
        SocketUtil.connectMap.remove(userFlag, client);
    }
}

代码简析：

⑥ 封装的socket 小函数

SocketUtil.java

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.corundumstudio.socketio.AckRequest;
import com.corundumstudio.socketio.SocketIOClient;
import com.corundumstudio.socketio.annotation.OnEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
/**
 * @Author: JCccc
 * @Description:
 * @Date: 2022/6/23 21:28
 */
@Component
public class SocketUtil {
    private final Logger log = LoggerFactory.getLogger(this.getClass());
    //暂且把用户&客户端信息存在缓存
    public static ConcurrentMap<String, SocketIOClient> connectMap = new ConcurrentHashMap<>();
    @OnEvent(value = "CHANNEL_SYSTEM")
    public void systemDataListener(String receiveMsg) {
        if (!StringUtils.hasLength(receiveMsg)){
            return;
        }
        JSONObject msgObject = (JSONObject) JSON.parse(receiveMsg);
        String userFlag = String.valueOf(msgObject.get("from"));
        String content = String.valueOf(msgObject.get("content"));
        log.info("收到用户 ： {} 推送到系统频道的一条消息 :{}",userFlag,content );
    }
    public void sendToAll(Map<String, Object> msg,String sendChannel) {
        if (connectMap.isEmpty()){
            return;
        }
        //给在这个频道的每个客户端发消息
        for (Map.Entry<String, SocketIOClient> entry : connectMap.entrySet()) {
            entry.getValue().sendEvent(sendChannel, msg);
        }
    }
    public void sendToOne(String userFlag, Map<String, Object> msg,String sendChannel) {
        //拿出某个客户端信息
        SocketIOClient socketClient = getSocketClient(userFlag);
        if (Objects.nonNull(socketClient) ){
            //单独给他发消息
            socketClient.sendEvent(sendChannel,msg);
        }
    }
    /**
     * 识别出客户端
     * @param userFlag
     * @return
     */
    public SocketIOClient getSocketClient(String userFlag){
        SocketIOClient client = null;
        if (StringUtils.hasLength(userFlag) &&  !connectMap.isEmpty()){
            for (String key : connectMap.keySet()) {
                if (userFlag.equals(key)){
                    client = connectMap.get(key);
                }
            }
        }
        return client;
    }
}

代码简析：

⑦写1个接口，模拟场景，前端页面调用后端接口，做消息推送

TestController.java

import com.socket.mysocket.dto.MyMessage;
import com.socket.mysocket.util.SocketUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.HashMap;
import java.util.Map;
/**
 * @Author: JCccc
 * @Description:
 * @Date: 2022/06/13 21:50
 */
@RestController
public class TestController {
    public final static String SEND_TYPE_ALL = "ALL";
    public final static String SEND_TYPE_ALONE = "ALONE";
    @Autowired
    SocketUtil socketUtil;
    @PostMapping("/testSendMsg")
    public String testSendMsg(@RequestBody MyMessage myMessage){
        Map<String, Object> map = new HashMap<>();
        map.put("msg",myMessage.getContent());
        //群发
        if (SEND_TYPE_ALL.equals(myMessage.getType())){
            socketUtil.sendToAll( map,myMessage.getChannel());
            return "success";
        }
        //指定单人
        if (SEND_TYPE_ALONE.equals(myMessage.getType())){
            socketUtil.sendToOne(myMessage.getTo(), map, myMessage.getChannel());
            return "success";
        }
        return "fail";
    }
}

代码简析：

好了，7步了。一切已经就绪了。

前端简单页面

接下来搞点前端HTML页面，玩一玩看看效果:

第一个页面：

TestClientStudentJC.html

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>我要连SOCKET</title>
    <base>
    <script src="https://cdn.bootcss.com/jquery/3.4.0/jquery.min.js"></script>
    <script src="https://cdn.bootcss.com/socket.io/2.2.0/socket.io.js"></script>
    <style>
        body {
            padding: 20px;
        }
        #console {
            height: 450px;
            overflow: auto;
        }
        .msg-color {
            color: green;
        }
    </style>
</head>
<body>
<div id="console" class="well"></div>
<div id="conversationDiv">
    <labal>给系统推消息</labal>
    <input type="text" id="content"/>
    <button id="btnSendToSystem" onclick="sendSys();">发送</button>
</div>
</body>
<script type="text/javascript">
    var socket;
    connect();
    function connect() {
        var userFlag = 'user_JC';
        var opts = {
            query: 'userFlag=' + userFlag
        };
        socket = io.connect('http://localhost:8503', opts);
        socket.on('connect', function () {
            console.log("连接成功");
            output('当前用户是：' + userFlag );
            output('<span class="msg-color">连接成功了。</span>');
        });
        socket.on('disconnect', function () {
            output('<span class="msg-color">下线了。 </span>');
        });
        socket.on('CHANNEL_STUDENT', function (data) {
            let msg= JSON.stringify(data)
            output('收到学生频道消息了：' + msg );
            console.log(data);
        });
        socket.on('CHANNEL_SYSTEM', function (data) {
            let msg= JSON.stringify(data)
            output('收到系统全局消息了：' + msg );
            console.log(data);
        });
    }
    function sendSys() {
        console.log('发送消息给服务端');
        var content = document.getElementById('content').value;
        socket.emit('CHANNEL_SYSTEM',JSON.stringify({
            'content': content,
            'from': 'user_JC'
        }));
    }
    function output(message) {
        var element = $("<div>" + message + "</div>");
        $('#console').prepend(element);
    }
</script>
</html>

代码简析：

第二个页面，跟第一个基本一样，改一下用户唯一标识：

TestClientStudentPU.html

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title>我要连SOCKET</title>
    <base>
    <script src="https://cdn.bootcss.com/jquery/3.4.0/jquery.min.js"></script>
    <script src="https://cdn.bootcss.com/socket.io/2.2.0/socket.io.js"></script>
    <style>
        body {
            padding: 20px;
        }
        #console {
            height: 450px;
            overflow: auto;
        }
        .msg-color {
            color: green;
        }
    </style>
</head>
<body>
<div id="console" class="well"></div>
<div id="conversationDiv">
    <labal>给系统推消息</labal>
    <input type="text" id="content"/>
    <button id="btnSendToSystem" onclick="sendSys();">发送</button>
</div>
</body>
<script type="text/javascript">
    var socket;
    connect();
    function connect() {
        var userFlag = 'user_PU';
        var opts = {
            query: 'userFlag=' + userFlag
        };
        socket = io.connect('http://localhost:8503', opts);
        socket.on('connect', function () {
            console.log("连接成功");
            output('当前用户是：' + userFlag );
            output('<span class="msg-color">连接成功了。</span>');
        });
        socket.on('disconnect', function () {
            output('<span class="msg-color">下线了。 </span>');
        });
        socket.on('CHANNEL_STUDENT', function (data) {
            let msg= JSON.stringify(data)
            output('收到学生频道消息了：' + msg );
            console.log(data);
        });
        socket.on('CHANNEL_SYSTEM', function (data) {
            let msg= JSON.stringify(data)
            output('收到系统全局消息了：' + msg );
            console.log(data);
        });
    }
    function sendSys() {
        console.log('发送消息给服务端');
        var content = document.getElementById('content').value;
        socket.emit('CHANNEL_SYSTEM',JSON.stringify({
            'content': content,
            'from': 'user_PU'
        }));
    }
    function output(message) {
        var element = $("<div>" + message + "</div>");
        $('#console').prepend(element);
    }
</script>
</html>