springboot整合webStock

创建配置类

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.socket.server.standard.ServerEndpointExporter;

@Configuration
public class WebSocketConfig {

    @Bean
    public ServerEndpointExporter serverEndpointExporter() {
        return new ServerEndpointExporter();
    }

}

创建服务类

import cn.hutool.log.Log;
import cn.hutool.log.LogFactory;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import org.springframework.stereotype.Component;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.commons.lang.StringUtils;



@ServerEndpoint("/server/{userId}")
@Component
public class WebSocketServer {

    static Log log= LogFactory.get(WebSocketServer.class);
    /**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 int onlineCount = 0;
    /**concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。*/
    private static ConcurrentHashMap<String,WebSocketServer> webSocketMap = new ConcurrentHashMap<>();
    /**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userId*/
    private String userId="";

    /**
     * 连接建立成功调用的方法*/
    @OnOpen
    public void onOpen(Session session,@PathParam("userId") String userId) {
        //解析发送的报文
//        JSONObject jsonObject = JSON.parseObject(message);
        this.session = session;
        this.userId = userId;
        if(webSocketMap.containsKey(userId)){
            webSocketMap.remove(userId);
            webSocketMap.put(userId,this);
            //加入set中
        }else{
            webSocketMap.put(userId,this);
            //加入set中
            addOnlineCount();
            //在线数加1
        }

        log.info("用户连接:"+userId+",当前在线人数为:" + getOnlineCount());

        try {
            sendMessage(JSON.toJSONString("连接成功"));
        } catch (IOException e) {
            log.error("用户:"+userId+",网络异常!!!!!!");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        if(webSocketMap.containsKey(userId)){
            webSocketMap.remove(userId);
            //从set中删除
            subOnlineCount();
        }
        log.info("用户退出:"+userId+",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("用户消息:" + message);
        JSONObject jsonObject = JSON.parseObject(message);
        String toUserId = jsonObject.getString("toUserId");
        //可以群发消息
        //消息保存到数据库、redis
        if(StringUtils.isNotBlank(toUserId)){
            try {
                if(StringUtils.isNotBlank(toUserId)&&webSocketMap.containsKey(toUserId)){
                    webSocketMap.get(toUserId).sendMessage("浩洁来访");
                }else{
                    log.error("请求的userId:"+toUserId+"不在该服务器上");
                    //否则不在这个服务器上，发送到mysql或者redis
                }
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    }

    /**
     *
     * @param session
     * @param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("用户错误:"+this.userId+",原因:"+error.getMessage());
        error.printStackTrace();
    }
    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message,Object data) throws EncodeException, IOException {
        this.session.getBasicRemote().sendObject(Result.ok(message,data));
    }

    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }


    /**
     * 发送自定义消息
     * */
    public static void sendInfo(String message,@PathParam("userId") String userId,Object data) throws IOException {
        log.info("发送消息到:"+userId);
        if(StringUtils.isNotBlank(userId)&&webSocketMap.containsKey(userId)){
            try {
                webSocketMap.get(userId).sendMessage(message,data);
            } catch (EncodeException e) {
                throw new RuntimeException(e);
            }
        }else{
            log.error("用户"+userId+",不在线！");
        }
    }
    public static void sendInfo(String message,@PathParam("userId") String userId) throws IOException {
        log.info("发送消息到:"+userId);
        if(StringUtils.isNotBlank(userId)&&webSocketMap.containsKey(userId)){
            webSocketMap.get(userId).sendMessage(message);
        }else{
            log.error("用户"+userId+",不在线！");
        }
    }
    public void sendAliveMessage(String s){
        try {
            ConcurrentHashMap.KeySetView<String, WebSocketServer> strings = webSocketMap.keySet();
            for (String userid : strings) {
                WebSocketServer.sendInfo(s, userid);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

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

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

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

}