klp-oa/scaner/src/main/java/org/example/WsServer.java

package org.example;

import javax.websocket.OnClose;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArraySet;

@ServerEndpoint("/ws")
public class WsServer {
    private static final Set<Session> sessions = new CopyOnWriteArraySet<>();

    @OnOpen
    public void onOpen(Session session) {
        sessions.add(session);
        System.out.println("WebSocket连接已建立: " + session.getId());
        // 推送所有扫码枪列表给前端（使用修改后的方法名）
//        String deviceListJson = Main.getAllDevicesJson();
//        try {
//            System.out.println("发送设备列表到前端: " + deviceListJson);
//            session.getBasicRemote().sendText(deviceListJson);
//        } catch (IOException e) {
//            e.printStackTrace();
//        }
    }

    @OnMessage
    public void onMessage(String message, Session session) throws IOException {
        System.out.println("收到消息: " + message);
        // 可以根据前端需求，在这里处理命令（比如刷新设备列表）
        if ("refreshDevices".equals(message)) {
//            String deviceListJson = Main.getAllDevicesJson();
//            session.getBasicRemote().sendText(deviceListJson);
        } else {
            session.getBasicRemote().sendText("服务器已收到: " + message);
        }
    }

    @OnClose
    public void onClose(Session session) {
        sessions.remove(session);
        System.out.println("WebSocket连接已关闭: " + session.getId());
    }

    public static void broadcast(String message) {
        for (Session session : sessions) {
            if (session.isOpen()) {
                try {
                    session.getBasicRemote().sendText(message);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}