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话不多说,直接上代码看效果!
一、服务端:
1、引用依赖
- <dependency>
- <groupId>org.springframework.boot</groupId>
- <artifactId>spring-boot-starter-websocket</artifactId>
- </dependency>
2、添加配置文件 WebSocketConfig
- @Configuration
- public class WebSocketConfig{
- @Bean
- public ServerEndpointExporter serverEndpointExporter() {
- return new ServerEndpointExporter();
- }
- }
3、编写WebSocket服务端接收、发送功能
声明接口代码:
- public interface IWebSocketService {
-
- void sendMessage(String message, List<String> toSids);
-
- String getMessage(String msg);
- }
实现类代码:
-
- @Slf4j
- @Service
- @ServerEndpoint("/api/websocket/{sid}")
- public class IWebSocketServiceImpl implements IWebSocketService {
- @Autowired
- RabbitTemplate rabbitTemplate;
-
- //静态变量,用来记录当前在线连接数。应该把它设计成线程安全的。
- private static 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WebSocket对象。
- private static CopyOnWriteArraySet<IWebSocketServiceImpl> webSocketSet = new CopyOnWriteArraySet<>();
-
- //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
- private Session session;
- //接收sid
- private String sid = "";
-
- @Override
- public void sendMessage(String message, List<String> toSids) {
- log.info("推送消息到客户端 " + toSids + ",推送内容:" + message);
-
- for (IWebSocketServiceImpl item : webSocketSet) {
- try {
- if (CollectionUtils.isEmpty(toSids)) {
- item.sendMessage(message);
- } else if (toSids.contains(item.sid)) {
- item.sendMessage(message);
- }
- } catch (IOException e) {
- continue;
- }
- }
- }
-
- @Override
- public String getMessage(String msg) {
- return null;
- }
-
-
- /**
- * 连接建立成功调用的方法
- */
- @OnOpen
- public void onOpen(Session session, @PathParam("sid") String sid) {
- this.session = session;
- webSocketSet.add(this); // 加入set中
- this.sid = sid;
- addOnlineCount(); // 在线数加1
- try {
- // sendMessage("conn_success");
- log.info("有新客户端开始监听,sid=" + sid + ",当前在线人数为:" + getOnlineCount());
- } catch (Exception e) {
- log.error("websocket IO Exception");
- }
- }
-
- /**
- * 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
- // 断开连接情况下,更新主板占用情况为释放
- log.info("释放的sid=" + sid + "的客户端");
- releaseResource();
- }
-
- @OnMessage
- public void onMessage(String message, Session session) {
- log.info("收到来自客户端 sid=" + sid + " 的信息:" + message);
- //此处为MQ接收功能,如果不使用则可以屏蔽,如果有需要可使用
- // if (rabbitTemplate == null) {
- // ApplicationContext context = springUtils.getApplicationContext();
- // rabbitTemplate = context.getBean(RabbitTemplate.class);
- // }
- // rabbitTemplate.convertAndSend(RabbitmqConfig.EXCHANGE_TOPICS_INFORM, //RabbitmqConfig.ROUTINGKEY_RETURN, message);
- // rabbitTemplate.convertAndSend(RabbitmqConfig.EXCHANGE_TOPICS_INFORM, //RabbitmqConfig.ROUTINGKEY_RETURN, message);
- // 群发消息
- // List<String> sids = new ArrayList<>();
- // for (WebSocketServer item : webSocketSet) {
- // sids.add(item.sid);
- // }
- // try {
- // sendMessage("客户端 " + this.sid + "发布消息:" + message, sids);
- // } catch (IOException e) {
- // e.printStackTrace();
- // }
- }
-
- private void releaseResource() {
- // 这里写释放资源和要处理的业务
- log.info("有一连接关闭!当前在线人数为" + getOnlineCount());
- }
-
- /**
- * 发生错误回调
- */
- @OnError
- public void onError(Session session, Throwable error) {
- log.error(session.getAsyncRemote() + "客户端发生错误");
- error.printStackTrace();
- }
-
- /**
- * 实现服务器主动推送消息到 指定客户端
- */
- public void sendMessage(String message) throws IOException {
- this.session.getAsyncRemote().sendText(message);
- }
-
- /**
- * 获取当前在线人数
- *
- * @return
- */
- public int getOnlineCount() {
- return onlineCount.get();
- }
-
- /**
- * 当前在线人数 +1
- *
- * @return
- */
- public void addOnlineCount() {
- onlineCount.getAndIncrement();
- }
-
- /**
- * 当前在线人数 -1
- *
- * @return
- */
- public void subOnlineCount() {
- onlineCount.getAndDecrement();
- }
-
- /**
- * 获取当前在线客户端对应的WebSocket对象
- *
- * @return
- */
- public CopyOnWriteArraySet<IWebSocketServiceImpl> getWebSocketSet() {
- return webSocketSet;
- }
-
- }

4、如果不需要实现客户端功能,此处可选择前端调用,奉上代码
- <!DOCTYPE html>
- <html>
-
- <head>
- <meta charset="utf-8">
- <title>Java后端WebSocket的Tomcat实现</title>
- <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>
- </head>
-
- <body>
- <div id="message"></div>
- <hr />
- <div id="main"></div>
- <div id="client"></div>
- <input id="text" type="text" />
- <button onclick="send()">发送消息</button>
- <hr />
- <button onclick="closeWebSocket()">关闭WebSocket连接</button>
- </body>
- <script type="text/javascript">
-
- var cid = Math.floor(Math.random() * 100); // 随机生成客户端id
- document.getElementById('client').innerHTML += "客户端 id = " + cid + '<br/>';
-
- var websocket = null;
-
- //判断当前浏览器是否支持WebSocket
- if ('WebSocket' in window) {
- // 改成你的地址
- websocket = new WebSocket("ws://127.0.0.1:9204/api/websocket/" + cid);
- } else {
- alert('当前浏览器 Not support websocket')
- }
-
- //连接发生错误的回调方法
- websocket.onerror = function () {
- setMessageInnerHTML("websocket.onerror: WebSocket连接发生错误");
- };
-
- //连接成功建立的回调方法
- websocket.onopen = function () {
- setMessageInnerHTML("websocket.onopen: WebSocket连接成功");
- }
-
- //接收到消息的回调方法
- websocket.onmessage = function (event) {
- setMessageInnerHTML("websocket.onmessage: " + event.data);
- }
-
- //连接关闭的回调方法
- websocket.onclose = function () {
- setMessageInnerHTML("websocket.onclose: WebSocket连接关闭");
- }
-
- //监听窗口关闭事件,当窗口关闭时,主动去关闭websocket连接,防止连接还没断开就关闭窗口,server端会抛异常。
- window.onbeforeunload = function () {
- closeWebSocket();
- }
-
- //将消息显示在网页上
- function setMessageInnerHTML(innerHTML) {
- document.getElementById('message').innerHTML += innerHTML + '<br/>';
- }
-
- //关闭WebSocket连接
- function closeWebSocket() {
- websocket.close();
- alert('websocket.close: 关闭websocket连接')
- }
-
- //发送消息
- function send() {
- var message = document.getElementById('text').value;
- try {
- websocket.send('{"msg":"' + message + '"}');
- setMessageInnerHTML("websocket.send: " + message);
- } catch (err) {
- console.error("websocket.send: " + message + " 失败");
- }
- }
- </script>
-
- </html>

二、客户端:
1、引用依赖
- <dependency>
- <groupId>org.java-websocket</groupId>
- <artifactId>Java-WebSocket</artifactId>
- <version>1.3.8</version>
- </dependency>
2、自定义WebSocket客户端,继承WebSocketClient类,实现发送、接收等功能
-
- /**
- * 自定义WebSocket客户端
- */
- public class CustomizedWebSocketClient extends WebSocketClient {
- private static final Logger logger = LoggerFactory.getLogger(CustomizedWebSocketClient.class);
-
- //用来接收数据
- private String excptMessage;
-
- /**
- * 线程安全的Boolean -是否受到消息
- */
- public AtomicBoolean hasMessage = new AtomicBoolean(false);
-
- /**
- * 线程安全的Boolean -是否已经连接
- */
- private AtomicBoolean hasConnection = new AtomicBoolean(false);
-
- /**
- * 构造方法
- *
- * @param serverUri
- */
- public CustomizedWebSocketClient(URI serverUri) {
- super(serverUri);
- logger.info("CustomizeWebSocketClient init:" + serverUri.toString());
- }
-
- /**
- * 打开连接是方法
- *
- * @param serverHandshake
- */
- @Override
- public void onOpen(ServerHandshake serverHandshake) {
- logger.info("CustomizeWebSocketClient onOpen");
- }
-
- /**
- * 收到消息时
- *
- * @param s
- */
- @Override
- public void onMessage(String s) {
- hasMessage.set(true);
- logger.info("CustomizeWebSocketClient onMessage:" + s);
- }
-
- public void sendMessage(String message){
- this.send(message);
- logger.info("已发送消息:" + message);
- }
-
- /**
- * 当连接关闭时
- *
- * @param i
- * @param s
- * @param b
- */
- @Override
- public void onClose(int i, String s, boolean b) {
- this.hasConnection.set(false);
- this.hasMessage.set(false);
- logger.info("CustomizeWebSocketClient onClose:" + s);
- }
-
- /**
- * 发生error时
- *
- * @param e
- */
- @Override
- public void onError(Exception e) {
- logger.error("CustomizeWebSocketClient onError:" + e);
- }
-
- @Override
- public void connect() {
- if(!this.hasConnection.get()){
- super.connect();
- hasConnection.set(true);
- }
- }
-
- //获取接收到的信息
- public String getExcptMessage() {
- if(excptMessage != null){
- String message = new String(excptMessage);
- excptMessage = null;
- return message;
- }
- return null;
- }
- }
-
-

3、创建连接封装类,uri对应socket服务的ip和端口号
- public class WebSocketClientSingleton {
- private static CustomizedWebSocketClient client;
- private WebSocketClientSingleton(){}
-
- public static CustomizedWebSocketClient getInstance() {
- if (client == null || client.isClosed()) {
- String webSocketUri = "ws://localhost:9204/api/websocket/12345678";
- try {
- //实例WebSocketClient对象,并连接到WebSocket服务端
- client = new CustomizedWebSocketClient(new URI(webSocketUri));
- client.connect();
- //等待服务端响应
- while (!client.getReadyState().equals(WebSocket.READYSTATE.OPEN)) {
- System.out.println("连接中···请稍后");
- Thread.sleep(1000);
- }
- } catch (URISyntaxException e) {
- e.printStackTrace();
- } catch (InterruptedException e) {
- throw new RuntimeException(e);
- }
- // return client;
- }
- return client;
- }
-
- public static void closeClient(CustomizedWebSocketClient client){
- client.close();
- }
- }

三、测试
- @Autowired
- private IWebSocketService webSocketService;
调用代码:
- //懒汉模式创建客户端连接
- CustomizedWebSocketClient customizedWebSocketClient = WebSocketClientSingleton.getInstance();
- //客户端发送消息
- customizedWebSocketClient.sendMessage("----客户端发送消息啦-----1123");
- //服务端发送消息
- webSocketService.sendMessage("服务端发送消息啦----223333",null);
- //关闭连接
- WebSocketClientSingleton.closeClient(customizedWebSocketClient);
控制台打印效果:
总结完毕
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