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websocket小例子（SpringBoot）

程序员文章站 2022-04-09 13:12:09
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前端

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset = utf-8"/>
    <title>WebSocket客户端</title>
    <script type="text/javascript">
        var socket;
        if(!window.WebSocket){
            window.WebSocket = window.MozWebSocket;
        }

        if(window.WebSocket){
            socket = new WebSocket("ws://localhost:8081/webSocket");
            socket.onmessage = function(event){
                // 接收到服务器的消息
                var ta = document.getElementById('responseContent');
                ta.value += event.data + "\r\n";
            };

            socket.onopen = function(event){

                var ta = document.getElementById('responseContent');
                ta.value = "你当前的浏览器支持WebSocket,请进行后续操作\r\n";
            };

            socket.onclose = function(event){
                var ta = document.getElementById('responseContent');
                ta.value = "";
                ta.value = "WebSocket连接已经关闭\r\n";
            };
        }else{
            alert("您的浏览器不支持WebSocket");
        }

        // 向 服务器 发送消息
        function send(message){
            if(!window.WebSocket){
                return;
            }
            if(socket.readyState == WebSocket.OPEN){
                socket.send(message);
            }else{
                alert("WebSocket连接没有建立成功！！");
            }
        }
    </script>
</head>
<body>
<form onSubmit="return false;">
    <input type = "text" name = "message" value = ""/>
    <br/><br/>
    <input type = "button" value = "发送WebSocket请求消息" onClick = "send(this.form.message.value)"/>
    <hr color="red"/>
    <h2>客户端接收到服务端返回的应答消息</h2>
    <textarea id = "responseContent" style = "width:1024px; height:300px"></textarea>
</form>
</body>
</html>

后端

controller 层

import org.springframework.stereotype.Component;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
import java.util.Date;
import java.util.concurrent.CopyOnWriteArraySet;

/**
 * webSocket 和 web 客户端通信
 */
@Component
@ServerEndpoint("/webSocket")
public class WebSocket {

    private Session session;

    private static CopyOnWriteArraySet<WebSocket> webSocketSet = new CopyOnWriteArraySet<>();

    @OnOpen
    public void onOpen(Session session) {
        this.session = session;
        webSocketSet.add(this);
        System.out.println("【websocket消息】有新的连接, 总数:"+ webSocketSet.size());
    }

    @OnClose
    public void onClose() {
        webSocketSet.remove(this);
        System.out.println("【websocket消息】连接断开, 总数:{}"+ webSocketSet.size());
    }

    @OnMessage
    public void onMessage(String message) {
        System.out.println("【websocket消息】收到客户端发来的消息:{}"+ message);
        sendMessage("收到了" );
    }

    public static void sendMessage(String message) {
        for (WebSocket webSocket: webSocketSet) {
            System.out.println("【websocket消息】广播消息, message={}"+ message);
            try {
                webSocket.session.getBasicRemote().sendText(message);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

}

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 {
    /**
     * ServerEndpointExporter 作用
     *
     * 这个Bean会自动注册使用@ServerEndpoint注解声明的websocket endpoint
     *
     * @return
     */
    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }
}

pom.xml

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

待续··· ···

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