udi-wms-java/src/main/java/com/glxp/api/config/WebSocketServer.java

package com.glxp.api.config;


import com.alibaba.fastjson.JSON;
import com.glxp.api.entity.system.WebSocketEntity;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

@Component
@Slf4j
@Service
@ServerEndpoint("/api/websocket/{sid}")
public class WebSocketServer {
    private static int onlineCount = 0;
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
    private Session session;
    private String sid = "";

    /**
     * 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(new WebSocketEntity("sys", "连接成功"));
            log.info("有新窗口开始监听:" + sid + ",当前在线人数为:" + getOnlineCount());
        } catch (IOException 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为：" + sid);
        //这里写你 释放的时候，要处理的业务
        log.info("有一连接关闭！当前在线人数为" + getOnlineCount());

    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @ Param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("收到来自窗口" + sid + "的信息:" + message);
        //群发消息
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(new WebSocketEntity("back", message));
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    /**
     * @ Param session
     * @ Param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(WebSocketEntity webSocketEntity) throws IOException {
        String message = JSON.toJSON(webSocketEntity).toString();
        this.session.getBasicRemote().sendText(message);
    }

    public static void sendInfo(String message, String type)  {
        log.info("推送消息到窗口" + type + "，推送内容:" + message);

        for (WebSocketServer item : webSocketSet) {
            try {
                if (type == null) {
                    item.sendMessage(new WebSocketEntity("sid", message));
                } else  {
                    item.sendMessage(new WebSocketEntity(type, message));
                }
            } catch (IOException e) {
                continue;
            }
        }
    }


    public static synchronized int getOnlineCount() {
        return onlineCount;
    }

    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }

    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }

    public static CopyOnWriteArraySet<WebSocketServer> getWebSocketSet() {
        return webSocketSet;
    }
}