TCP客户端Spring与Java Config的集成

Question

我正在尝试创建一个TCP客户端以连接到远程tcp服务器并等待接收消息。 到目前为止，我有以下代码：

@EnableIntegration
@IntegrationComponentScan
@Configuration
public class TcpClientConfig {

@Bean
public TcpInboundGateway tcpInbound(AbstractClientConnectionFactory connectionFactory) {
    TcpInboundGateway gate = new TcpInboundGateway();
    gate.setConnectionFactory(connectionFactory);
    gate.setClientMode(false);
    gate.setRequestChannel(fromTcp());
    return gate;
}

@Bean
public MessageChannel fromTcp() {
    return new DirectChannel();
}

@MessageEndpoint
public static class Echo {

    @Transformer(inputChannel = "fromTcp", outputChannel = "serviceChannel")
    public String convert(byte[] bytes) {
        return new String(bytes);
    }
}

@ServiceActivator(inputChannel = "serviceChannel")
public void messageToService(String in) {
    System.out.println(in);
}

@Bean
public EndOfLineSerializer endOfLineSerializer() {
    return new EndOfLineSerializer();
}

@Bean
public AbstractClientConnectionFactory clientConnectionFactory() {
    TcpNetClientConnectionFactory tcpNetServerConnectionFactory = new TcpNetClientConnectionFactory("192.XXX.XXX.XX", 4321);
    tcpNetServerConnectionFactory.setSingleUse(false);
    tcpNetServerConnectionFactory.setSoTimeout(300000);
   tcpNetServerConnectionFactory.setDeserializer(endOfLineSerializer());
    tcpNetServerConnectionFactory.setSerializer(endOfLineSerializer());
    tcpNetServerConnectionFactory.setMapper(new TimeoutMapper());
    return tcpNetServerConnectionFactory;
}
}

它启动并连接到远程服务器。 但是，我在serviceActivator方法messageToService没有收到任何数据。 为了确保数据存在，我可以使用telnet成功连接到远程tcp服务器

telnet 192.XXX.XXX.XX 4321
Trying 192.XXX.XXX.XX...
Connected to 192.XXX.XXX.XX.
Escape character is '^]'.
Hello World

我确认没有任何东西击中我的EndOfLineSerializer 。 TCP客户端怎么了？

奖励 ：假设主机名和端口是通过查询API来确定的。 我如何告诉TcpNetClientConnectionFactory等待尝试连接，直到获得正确的端口数据为止？

调试输出：

main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2018-11-22 23:00:46.182 DEBUG 35953 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Autodetecting user-defined JMX MBeans
2018-11-22 23:00:46.194 DEBUG 35953 --- [           main] .s.i.c.GlobalChannelInterceptorProcessor : No global channel interceptors.
2018-11-22 23:00:46.198 DEBUG 35953 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Starting beans in phase -2147483648
2018-11-22 23:00:46.198  INFO 35953 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : Adding {logging-channel-adapter:_org.springframework.integration.errorLogger} as a subscriber to the 'errorChannel' channel
2018-11-22 23:00:46.198  INFO 35953 --- [           main] o.s.i.channel.PublishSubscribeChannel    : Channel 'application.errorChannel' has 1 subscriber(s).
2018-11-22 23:00:46.198  INFO 35953 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : started _org.springframework.integration.errorLogger
2018-11-22 23:00:46.198 DEBUG 35953 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Successfully started bean '_org.springframework.integration.errorLogger'
2018-11-22 23:00:46.198  INFO 35953 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : Adding {service-activator:tcpClientConfig.messageToService.serviceActivator} as a subscriber to the 'serviceChannel' channel
2018-11-22 23:00:46.198  INFO 35953 --- [           main] o.s.integration.channel.DirectChannel    : Channel 'application.serviceChannel' has 1 subscriber(s).
2018-11-22 23:00:46.198  INFO 35953 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : started tcpClientConfig.messageToService.serviceActivator
2018-11-22 23:00:46.198 DEBUG 35953 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Successfully started bean 'tcpClientConfig.messageToService.serviceActivator'
2018-11-22 23:00:46.198  INFO 35953 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : Adding {transformer:tcpClientConfig.Echo.convert.transformer} as a subscriber to the 'toTcp' channel
2018-11-22 23:00:46.198  INFO 35953 --- [           main] o.s.integration.channel.DirectChannel    : Channel 'application.toTcp' has 1 subscriber(s).
2018-11-22 23:00:46.198  INFO 35953 --- [           main] o.s.i.endpoint.EventDrivenConsumer       : started tcpClientConfig.Echo.convert.transformer
2018-11-22 23:00:46.198 DEBUG 35953 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Successfully started bean 'tcpClientConfig.Echo.convert.transformer'
2018-11-22 23:00:46.198 DEBUG 35953 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Starting beans in phase 0
2018-11-22 23:00:46.199  INFO 35953 --- [           main] .s.i.i.t.c.TcpNetClientConnectionFactory : started clientConnectionFactory, host=192.XXX.XXX.90, port=4321
2018-11-22 23:00:46.199 DEBUG 35953 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Successfully started bean 'clientConnectionFactory'
2018-11-22 23:00:46.199  INFO 35953 --- [           main] .s.i.i.t.c.TcpNetClientConnectionFactory : started clientConnectionFactory, host=192.XXX.XXX.90, port=4321
2018-11-22 23:00:46.199  INFO 35953 --- [           main] o.s.i.ip.tcp.TcpInboundGateway           : started tcpInbound
2018-11-22 23:00:46.199 DEBUG 35953 --- [           main] o.s.c.support.DefaultLifecycleProcessor  : Successfully started bean 'tcpInbound'

Answer 1

当将客户端连接工厂与入站端点一起使用时，不会刺激打开连接（客户端工厂通常用于出站操作，并且在发送第一条消息时会建立连接）。

在此模式下使用时，需要setClientMode(true) 。 这将启动一个任务，该任务打开（并监视）出站连接。

请参阅说明文件

通常，入站适配器使用type="server"连接工厂，该工厂监听传入的连接请求。 在某些情况下，您可能需要反向建立连接，以使入站适配器连接到外部服务器，然后在该连接上等待入站消息。

通过在入站适配器上设置client-mode="true" ，可以支持此拓扑。 在这种情况下，连接工厂必须为client类型，并且必须将单次使用设置为false。

另外两个属性支持此机制。 retry-interval指定（以毫秒为单位）框架在连接失败后尝试重新连接的频率。 scheduler提供TaskScheduler来调度连接尝试并测试连接是否仍处于活动状态。

（该框架提供了默认的调度程序）。

对于您的Bonus问题，您需要在创建应用程序上下文之前找到主机/端口。 或在获取信息后动态创建连接工厂和网关。