2025-11-29 zwy 在websocket断开时给5秒延时，给前端刷新缓冲

zhaowenyu

2025-11-29 8b459796efa4f1e0571f4436953a52d25a063e70

 ard-sample/src/main/java/com/ard/sample/component/websocket/handler/DockWebSocketHandler.java

@@ -17,6 +17,9 @@
import java.io.IOException;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

@Slf4j
@Component
@@ -36,6 +39,13 @@

    // 关键：为每个WebSocketSession分配独立的锁对象，确保写操作同步
    private final Map<WebSocketSession, Object> sessionLocks = new ConcurrentHashMap<>();

    // 延时任务线程池（单线程，守护线程），用于处理连接关闭后的延时清理
    private final ScheduledExecutorService delayExecutor = Executors.newSingleThreadScheduledExecutor(runnable -> {
        Thread thread = new Thread(runnable, "websocket-关闭-延迟-线程");
        thread.setDaemon(true); // 设为守护线程，不阻塞JVM退出
        return thread;
    });

    /**
     * 连接建立后回调
@@ -130,18 +140,34 @@
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        String userId = (String) session.getAttributes().get("userId");
        if (userId != null) {
            userSessions.remove(userId);
            sessionLocks.remove(session); // 移除会话锁
            // 关闭远程调试模式,暂时写死sn，后续改为动态获取sn
            ResponseResult responseResult = _controlService.controlDock("7CTDLCE00A1UPE","debug_mode_close",null);
            log.info("关闭远程调试模式");
            if(responseResult.getCode() == ResponseResult.CODE_SUCCESS){
                log.info("关闭远程调试模式成功");
            }
            // 清除该用户的所有订阅
            removeUserAllSubscriptions(userId);
            //System.out.println("用户[" + userId + "]已断开连接，当前在线人数：" + userSessions.size());
            log.info("用户[{}]已断开连接，当前在线人数：{}", userId, userSessions.size());
            log.info("用户[{}]连接关闭，将延时5秒执行清理操作（给前端刷新缓冲）", userId);

            // 延时3秒执行清理逻辑
            delayExecutor.schedule(() -> {
                try {

                    userSessions.remove(userId);
                    sessionLocks.remove(session); // 移除会话锁
                    // 关闭远程调试模式,暂时写死sn，后续改为动态获取sn
        //            ResponseResult responseResult = _controlService.controlDock("7CTDLCE00A1UPE","debug_mode_close",null);
        //            log.info("关闭远程调试模式");
        //            if(responseResult.getCode() == ResponseResult.CODE_SUCCESS){
        //                log.info("关闭远程调试模式成功");
        //            }
                    // 清除该用户的所有订阅
                    removeUserAllSubscriptions(userId);
                    //System.out.println("用户[" + userId + "]已断开连接，当前在线人数：" + userSessions.size());
//                    log.info("用户[{}]已断开连接，当前在线人数：{}", userId, userSessions.size());
                    log.info("用户[{}]延时5秒清理完成，当前在线人数：{}", userId, userSessions.size());
                } catch (Exception e) {
                    log.error("用户[{}]延时清理操作异常", userId, e);
                }
            }, 5, TimeUnit.SECONDS); // 延时5秒执行
        }
        else {
            // 无认证用户，直接清理会话锁（无需延时）
            sessionLocks.remove(session);
            log.info("无认证用户连接关闭，直接清理会话锁");
        }
    }