When websocket is used in springboot, jackson library is used to serialize and deserialize messages by default. If you need to modify the serialization of websocket messages, you can follow the following steps:

1. Create a customized message serializer: You can create a customized message serializer by implementing org. Spring framework. messaging.simp.stomp.encoder interface. Interface defines two methods: encode and supports, which are used to encode messages into byte arrays and determine whether a certain message type is supported.

2. Configure websocket message converter: In the configuration class of SpringBoot, configure WebSocket message converter by rewriting the configureMessageConverters method or adding @Bean annotation. In the configuration, add the customized message serializer to the messageConverter in WebsocketMessageBrokerConfigurer.

3. Use a custom message serializer: When writing a WebSocket controller, you can directly use a custom message serializer.