SpringBoot集成WebSocket问题记录 javax.websocket.DeploymentException: Multiple Endpoints may not be deploye-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_30495285/article/details/86438385

本文详细介绍如何在Spring Boot项目中配置和使用WebSocket，包括必要的Maven依赖、配置类及服务器端点的创建。通过示例代码展示了连接建立、消息发送及断开连接的处理方式。

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1.pom需要的包

dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-websocket</artifactId>
</dependency>

2.springboot启动需要的配置，注意如果要打包war在tomcat中启动不需要一定要注释掉，不然会报错

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

@Configuration
public class WebSocketConfig{
//tomcat启动不需要此bean
//    @Bean
//    public ServerEndpointExporter serverEndpointExporter() {
//        return new ServerEndpointExporter();
//    }
}

@ServerEndpoint("/ws/{username}")
@Component
public class WebSocketServer {
    private Logger logger = LoggerFactory.getLogger(this.getClass());
    public static int onlineNumber = 0;
    private static Map<String, Session> clients = new ConcurrentHashMap<>();
    @OnOpen
    public void onOpen(@PathParam("username") String username, Session session) {
        try {
            onlineNumber++;
            logger.info("现在来连接的客户id：" + session.getId() + "用户名：" + username);
            logger.info("有新连接加入！ 当前在线人数" + onlineNumber);
            clients.put(username.toLowerCase(), session);
            sendMessageTo("连接成功", username);
        } catch (Exception e) {
            logger.info("连接出现异常");
            e.printStackTrace();
        }

    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose(Session session) {
        onlineNumber--;
        try {
            for (Map.Entry<String, Session> entry : clients.entrySet()) {
                String user = entry.getKey();
                Session csession = entry.getValue();
                if (session.equals(csession)) {
                    clients.remove(user);
                    break;
                }
            }
            logger.info("有连接关闭！ 当前在线人数" + onlineNumber);
        } catch (Exception e) {
            e.printStackTrace();
        }



    }

    public static void sendMessageTo(String message, String ToUserName) {
        try {
            for (Map.Entry<String, Session> entry : clients.entrySet()) {
                String user = entry.getKey();
                if (ToUserName.equals(user)) {
                    Session csession = entry.getValue();
                    csession.getAsyncRemote().sendText(message);
                    break;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

后台配置完。