如何在Spring-Integration中的拦截器中获取消息头

import org.springframework.integration.handler.advice.RequestHandlerInterceptor;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.messaging.support.ChannelInterceptorAdapter;
import org.springframework.messaging.support.MessageBuilder;

public class CustomInterceptor implements RequestHandlerInterceptor {

    @Override
    public boolean preSend(Message<?> message, MessageChannel channel) {
        // 在这里获取消息头
        String headerValue = message.getHeaders().get("headerName", String.class);
        System.out.println("Header value: " + headerValue);
        
        // 返回true表示继续处理消息，返回false表示停止处理消息
        return true;
    }

    @Override
    public void postSend(Message<?> message, MessageChannel channel, boolean sent) {
        // 在消息发送后执行的逻辑
    }

    @Override
    public void afterSendCompletion(Message<?> message, MessageChannel channel, boolean sent, Exception ex) {
        // 在消息发送完成后执行的逻辑
    }

    @Override
    public boolean preReceive(MessageChannel channel) {
        // 在消息接收前执行的逻辑
        return true;
    }

    @Override
    public Message<?> postReceive(Message<?> message, MessageChannel channel) {
        // 在消息接收后执行的逻辑
        return message;
    }
}

<int:channel id="inputChannel" interceptors="customInterceptor">
    <!-- 其他配置 -->
</int:channel>

<int:gateway id="myGateway" service-interface="com.example.MyGateway" default-request-channel="inputChannel"
    advice-chain="customInterceptor">
    <!-- 其他配置 -->
</int:gateway>