首先添加一下 pom 依赖

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

然后添加一个 WebSocketConfig 配置类

/**
 * @author wuwx
 */
@EnableWebSocket
@Configuration
public class WebSocketConfig implements WebSocketConfigurer {
    @Override
    public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) {
        registry.addHandler(new TextWebSocketHandler(), "/websocket");
    }
}

启动这个 SpringBoot 项目就可以在 /websocket 进行 WebSocket 连接了