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Practical application of WebSocket

2022-08-03 04:33:00 【breaking wind】

第一步：引入POM依赖

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

第二步：java代码如下

package com.ruoyi.web.controller.websoket;

import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import javax.websocket.*;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;

@ServerEndpoint(value = "/webSocket/dealWith")
@Component
public class WebSocketServer {

    public static String userId = null;

    @PostConstruct
    public void init() {
        System.out.println("websocket 加载");
    }
    private static final AtomicInteger OnlineCount = new AtomicInteger(0);
    // concurrent包的线程安全Set,用来存放每个客户端对应的Session对象.
    private static CopyOnWriteArraySet<Session> SessionSet = new CopyOnWriteArraySet<Session>();
    public static Map<String,Session> map = new HashMap<>();

    /**
     * The connection is established to successfully call the method and print out the relevant data
     */
    @OnOpen
    public void onOpen(Session session) {
        SessionSet.add(session);
        map.put(userId,session);
        int cnt = OnlineCount.incrementAndGet(); // 在线数加1
        System.out.printf("有连接加入,当前连接数为："+ cnt);
        SendMessage(session, "连接成功");
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose(Session session) {
        SessionSet.remove(session);
        int cnt = OnlineCount.decrementAndGet();
        System.out.printf("有连接关闭,当前连接数为："+ cnt);
    }

    /**
     * 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.printf("来自客户端的消息："+ message);
        SendMessage(session, "收到消息,消息内容："+ message);

    }

    /**
     * 出现错误
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.printf("发生错误：{},Session ID： {}",error.getMessage(),session.getId());
        error.printStackTrace();
    }

    /**
     * 发送消息,实践表明,每次浏览器刷新,session会发生变化.
     * @param session
     * @param message
     */
    public static void SendMessage(Session session, String message) {
        try {
            session.getBasicRemote().sendText(message);
        } catch (IOException e) {
            System.out.printf("发送消息出错："+ e.getMessage());
            e.printStackTrace();
        }
    }

    /**
     * 群发消息
     * @param message
     * @throws IOException
     */
    public static void BroadCastInfo(String message) throws IOException {
        for (Session session : SessionSet) {
            if(session.isOpen()){
                SendMessage(session, message);
            }
        }
    }

    /**
     * 指定Session发送消息
     * @param sessionId
     * @param message
     * @throws IOException
     */
    public static void SendMessage(String message,String sessionId) throws IOException {
        Session session = null;
        for (Session s : SessionSet) {
            if(s.getId().equals(sessionId)){
                session = s;
                break;
            }
        }
        if(session!=null){
            SendMessage(session, message);
        }
        else{
            System.out.printf("没有找到你指定ID的会话："+ sessionId);
        }
    }
}

第三步：上JS代码

<!DOCTYPE html>
<html lang="zh" xmlns:th="http://www.thymeleaf.org" xmlns:shiro="http://www.pollix.at/thymeleaf/shiro">
<head>
    <meta charset="UTF-8">
    <title>websocket测试</title>
    <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
    <style type="text/css">
        h3,h4{
            text-align:center;
        }
    </style>
</head>
<body>

<h3>WebSocket测试,客户端接收到的消息如下：</h3>

<textarea id = "messageId" readonly="readonly" cols="150" rows="30" >

</textarea>


<script type="text/javascript">

    var socket;
    if (typeof (WebSocket) == "undefined") {
        console.log("遗憾：您的浏览器不支持WebSocket");
    } else {
        console.log("恭喜：您的浏览器支持WebSocket");
        //实现化WebSocket对象
        //指定要连接的服务器地址与端口建立连接
        //注意ws、wss使用不同的端口.我使用自签名的证书测试,
        //无法使用wss,浏览器打开WebSocket时报错
        //ws对应http、wss对应https.
        socket = new WebSocket("ws://localhost:8085/project/dealWith");
        //连接打开事件
        socket.onopen = function() {
            console.log("Socket 已打开");
            socket.send("消息发送测试(12356)");
        };
        //收到消息事件
        socket.onmessage = function(msg) {
            $("#messageId").append(msg.data+ "\n");

            console.log(msg.data  );
        };
        //连接关闭事件
        socket.onclose = function() {
            console.log("Socket已关闭");
        };
        //发生了错误事件
        socket.onerror = function() {
            alert("Socket发生了错误");
        }
        //窗口关闭时,关闭连接
        window.unload=function() {
            socket.close();
        };
    }


</script>

</body>

</html>

后续补充：如果使用上面的代码socket报404If so, you can refer to the following methods to solve it

报404We must first rule out the limitation of our project's built-in interception,如果都没问题的话springBootIt will also have an ambassadorsocket404问题,How to solve can refer to the code below,首先我们引入socker指定依赖,不能使用Spring自带的依赖,need us to quote separately

   <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-websocket</artifactId>
            <version>1.3.5.RELEASE</version>
        </dependency>

引入socket的配置

package com.odcchina.fai.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

@Configuration
public class WebSocketConfig {
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

The problem can be solved by the above steps！！！！！！！！！！！！

原网站

版权声明
本文为[breaking wind]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/215/202208030422018067.html

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