SpringBoot3集成WebSocket的全过程

Connected to ws://127.0.0.1:8088/web/socket/msg

Handshake Details
Request URL: http://127.0.0.1:8088/web/socket/msg
Request Method: GET
Status Code: 101 

Request Headers
Sec-WebSocket-Version: 13
Sec-WebSocket-Key: 5Qrs8JeRLsiY9G/PRJUocQ==
Connection: Upgrade
Upgrade: websocket
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits
Host: 127.0.0.1:8088

Response Headers
Upgrade: websocket
Connection: upgrade
Sec-WebSocket-Accept: E3aFw2bBzxByPCynmQ7lZ+7BgsU=
Sec-WebSocket-Extensions: permessage-deflate;client_max_window_bits=15

<!--WebSocket-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
    <version>${spring-boot.version}</version>
</dependency>

@ServerEndpoint("/web/socket/msg")
public class MsgWebSocket {

    private static final  ConcurrentHashMap<String,Session> sessions = new ConcurrentHashMap<>();

    private static final AtomicInteger onlineCount = new AtomicInteger(0);

    /**
     * 建立连接调用的方法
     */
    @OnOpen
    public void onOpen(Session session) {
        String userId = session.getRequestParameterMap().get("userId").get(0);
        // 加入Set中
        sessions.put(userId,session);
        // 在线数增加
        onlineCount.getAndIncrement();
        log.info("session-{},online-count-{}",session.getId(),onlineCount.get());
    }

    /**
     * 客户端消息处理的方法
     */
    @OnMessage
    public void sendMsg(Session sender,String message) throws Exception {
        MsgDTO dto = JSONUtil.toBean(message, MsgDTO.class);
        Session receiver = sessions.get(dto.getUserId());
        if (receiver != null) {
            receiver.getBasicRemote().sendText(dto.getMsg());
        }
    }

    /**
     * 关闭连接调用的方法
     */
    @OnClose
    public void onClose(Session session) {
        String userId = session.getRequestParameterMap().get("userId").get(0);
        // 从Set中删除
        sessions.remove(userId);
        // 在线数减少
        onlineCount.getAndDecrement();
        log.info("session-{},down-line-count-{}",session.getId(),onlineCount.get());
    }

    /**
     * 发生错误调用的方法
     */
    @OnError
    public void onError(Session session, Throwable throwable) throws Exception {
        log.error("Web Stock Error", throwable);
        session.getBasicRemote().sendText(throwable.getMessage());
    }
}