Websocket练习

2019-04-17  本文已影响0人  国王兔子

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>
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--;
    }
}
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();
    }

}

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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