书上配置WebSocket的方法在springboot2.x已经过时
在1.x版本中写法如下:
@Configuration
@EnableWebSocketMessageBroker//1
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer{
}
在2.x之后改为:
@Configuration
@EnableWebSocket
public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
}