springboot集成websocket实现给单人或多人发送数据

服务器端：

@Configuration
public class WebSocketConfig {

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

　　

package cn.socket;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
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 java.util.concurrent.CopyOnWriteArraySet;


@Component
@ServerEndpoint("/pull/test/{id}")
public class WebSocketServer {

    public WebSocketServer() {
        System.out.println("---------创建socket---------");
    }

    private static int onlineCount = 0;
    private static ConcurrentHashMap<String, WebSocketServer> webSocketSet = new ConcurrentHashMap<>();
    private static CopyOnWriteArraySet<WebSocketServer> webSockets =new CopyOnWriteArraySet<>();

    //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;

    private static Logger log = LogManager.getLogger(WebSocketServer.class);
    private String id = "";
    /**
     * 连接建立成功调用的方法*/
    @OnOpen
    public void onOpen(@PathParam(value = "id") String id, Session session) {
        this.session = session;
        this.id = id;//接收到发送消息的人员编号
        webSocketSet.put(id, this);     //加入set中
        webSockets.add(this);
        addOnlineCount();           //在线数加1
        log.info("用户"+id+"加入！当前在线人数为" + getOnlineCount());
        try {
            sendMessage("连接成功");
        } catch (IOException e) {
            log.error("websocket IO异常");
        }
    }

    /**
     * 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
        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("来自客户端的消息:" + message);
        //可以自己约定字符串内容，比如 内容|0 表示信息群发，内容|X 表示信息发给id为X的用户
        String sendMessage = message.split("[|]")[0];
        String sendUserId = message.split("[|]")[1];
        try {
            if(sendUserId.equals("0"))
                sendtoAll(sendMessage);
            else
                sendtoUser(sendMessage,sendUserId);
        } 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();
    }


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


    /**
     * 发送信息给指定ID用户，如果用户不在线则返回不在线信息给自己
     * @param message
     * @param sendUserId
     * @throws IOException
     */
    public void sendtoUser(String message,String sendUserId) throws IOException {
        if (webSocketSet.get(sendUserId) != null) {
            if(!id.equals(sendUserId))
                webSocketSet.get(sendUserId).sendMessage( "用户" + id + "发来消息：" + " <br/> " + message);
            else
                webSocketSet.get(sendUserId).sendMessage(message);
        } else {
            //如果用户不在线则返回不在线信息给自己
            sendtoUser("当前用户不在线",id);
        }
    }

    /**
     * 发送信息给所有人
     * @param message
     * @throws IOException
     */
    public void sendtoAll(String message) throws IOException {
        for (String key : webSocketSet.keySet()) {
            try {
                webSocketSet.get(key).sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public void sendtoAll2(String message) throws IOException {
        for (WebSocketServer webSocket : webSockets) {
            try {
                webSocket.sendMessage(message);
            } 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--;
    }

}

　　

@RestController("outController")
@Api(tags = "外部接口管理")
@CrossOrigin //跨域访问 swagger 要使用到
public class OutController extends BaseController {

    @Autowired
    private WebSocketServer webSocketServer;

  
    @ApiOperation("推送数据")
    @GetMapping("/toHome")
    public void toHome() throws Exception {
        webSocketServer.sendtoAll2("1");
    }
}

　　前端代码：

<!DOCTYPE html>
<html style="height: 100%;">

<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=Edge" />
    <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
    <title>创建缓冲区</title>
    
    
    
</head>

<body style="height: 100%;">
    
    <script type="text/javascript">
	    const ws=new WebSocket('ws://localhost:33002/tianjin-cim/tuchu/apis/pull/test/1');
    ws.onmessage =function(e){
      console.log(e)
    };
	
    </script>
</body>

</html>