springboot集成websocket实现消息推送

要实现Spring Boot集成WebSocket实现消息推送，需要进行以下步骤：

1. 添加Spring Boot WebSocket依赖
2. 创建WebSocket配置类
3. 创建WebSocket处理器类
4. 创建WebSocket拦截器类
5. 创建WebSocket消息模型类
6. 在Spring Boot中使用WebSocket

下面是一个简单的示例代码：

1. 添加Spring Boot WebSocket依赖

在pom.xml文件中添加以下依赖：

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

2. 创建WebSocket配置类

创建一个WebSocket配置类，用于配置WebSocket相关的参数，如下所示：

@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketConfigurer {

    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(new WebSocketHandler(), "/websocket").addInterceptors(new WebSocketInterceptor());
    }
}

3. 创建WebSocket处理器类

创建一个WebSocket处理器类，用于处理WebSocket连接、断开连接和接收消息等操作，如下所示：

public class WebSocketHandler extends TextWebSocketHandler {

    private static final List<WebSocketSession> sessions = new CopyOnWriteArrayList<>();

    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        sessions.add(session);
    }

    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        sessions.remove(session);
    }

    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
        for (WebSocketSession s : sessions) {
            s.sendMessage(message);
        }
    }
}

4. 创建WebSocket拦截器类

创建一个WebSocket拦截器类，用于拦截WebSocket连接请求，如下所示：

public class WebSocketInterceptor implements HandshakeInterceptor {

    @Override
    public boolean beforeHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Map<String, Object> attributes) throws Exception {
        return true;
    }

    @Override
    public void afterHandshake(ServerHttpRequest request, ServerHttpResponse response, WebSocketHandler wsHandler, Exception exception) {

    }
}

5. 创建WebSocket消息模型类

创建一个WebSocket消息模型类，用于封装WebSocket消息，如下所示：

public class WebSocketMessage {

    private String content;

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }
}

6. 在Spring Boot中使用WebSocket

在Spring Boot中使用WebSocket非常简单，只需要在Controller中注入WebSocketSession即可，如下所示：

@Controller
public class WebSocketController {

    @Autowired
    private WebSocketSession session;

    @MessageMapping("/send")
    public void send(WebSocketMessage message) throws Exception {
        session.sendMessage(new TextMessage(message.getContent()));
    }
}