如何拦截Spring Cloud Stream消息?

能够使用 GlobalChannelInterceptor 注释和 ChannelInterceptor 界面参见下面的示例。

import org.springframework.integration.config.GlobalChannelInterceptor;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageChannel;
import org.springframework.messaging.support.ChannelInterceptor;
import org.springframework.stereotype.Component;

@Component
@GlobalChannelInterceptor
public class Interceptor implements ChannelInterceptor {

    private final Logger log = LoggerFactory.getLogger(Interceptor.class);

    @Override
    public Message<?> preSend(Message<?> msg, MessageChannel mc) {
        log.info("In preSend");
        return msg;
    }

    @Override
    public void postSend(Message<?> msg, MessageChannel mc, boolean bln) {
        log.info("In postSend");
    }

    @Override
    public void afterSendCompletion(Message<?> msg, MessageChannel mc, boolean bln, Exception excptn) {
        log.info("In afterSendCompletion");
    }

    @Override
    public boolean preReceive(MessageChannel mc) {
        log.info("In preReceive");
        return true;
    }

    @Override
    public Message<?> postReceive(Message<?> msg, MessageChannel mc) {
        log.info("In postReceive");
        return msg;
    }

    @Override
    public void afterReceiveCompletion(Message<?> msg, MessageChannel mc, Exception excptn) {
        log.info("In afterReceiveCompletion");
    }

}

不确定这里的拦截是什么意思——您给出的两个示例都不是基于消息的:)。

但如果要访问完整消息,可以将其用作 @StreamListener 或 @ServiceActivator -带注释的方法。此外,Spring Cloud Stream允许您建立完整的Spring Integration管道,因此您可以添加建议和所需的所有内容-请参阅此处: https://github.com/spring-projects/spring-integration-java-dsl/wiki/Spring-Integration-Java-DSL-Reference .

我鼓励您也查看一下Spring Integration参考 http://docs.spring.io/autorepo/docs/spring-integration/4.2.6.RELEASE/reference/html/ Spring Cloud Stream自动注入通道,从那里您可以完全自由地构建管道。

希望这能有所帮助, 马吕斯