Spring integration默认输出通道不工作

Question

在我的应用程序中，我试图基于从服务方法返回的http状态值进行路由，其余的http状态将被路由到默认错误通道。但是这种默认映射不起作用，

@Bean
public IntegrationFlow bridgeFlow() {
    return IntegrationFlows.from(ApplicationConfiguration.QUEUE_CHANNEL)
            .bridge(e -> e.poller(Pollers.fixedDelay(2500).maxMessagesPerPoll(MAX_MSG_PER_POLL)))
            .handle(someService, "someMethod")
            .route(router())                
            .get();
}

public ExpressionEvaluatingRouter router() {
    ExpressionEvaluatingRouter router = new ExpressionEvaluatingRouter("headers['httpStatus']");
    router.setChannelMapping("422", REJECTED_QUEUE_CHANNEL);
    router.setChannelMapping("202", "nullChannel");
    router.setChannelMapping("201", "nullChannel");
    router.setDefaultOutputChannelName(ORR_FAILED_QUEUE_CHANNEL);// When I receive other status codes it should go into this channel. But it's not going and throwing a runtime exception when a status code other than these is received.
    return router;
}

Answer 1

您无法在路由器上将此选项设置为false:

/**
 * Specify whether this router should ignore any failure to resolve a channel name to
 * an actual MessageChannel instance when delegating to the ChannelResolver strategy.
 * @param resolutionRequired true if resolution is required.
 */
public void setResolutionRequired(boolean resolutionRequired) {

关于这个问题有一个文档:https://docs.spring.io/spring-integration/docs/current/reference/html/message-routing.html#router-common-parameters