Question

我想使用spring-integration列出FTP服务器上的所有文件，例如，在屏幕上打印它们。我做过这样的事情：

上下文：

<int:channel id="toSplitter">
    <int:interceptors>
        <int:wire-tap channel="logger"/>
    </int:interceptors>
</int:channel>

<int:logging-channel-adapter id="logger" log-full-message="true"/>
<int:splitter id="splitter" input-channel="toSplitter" output-channel="getFtpChannel"/>

<int-ftp:outbound-gateway id="gatewayLS"
                        session-factory="ftpClientFactory"
                        request-channel="inbound"
                        command="ls"
                        expression="payload"
                        reply-channel="toSplitter"/>
<int:channel id="getFtpChannel">
    <int:queue/>
</int:channel>
    <bean id="ftpClientFactory"
        class="org.springframework.integration.ftp.session.DefaultFtpSessionFactory">
    <property name="host" value="${host}"/>
    <property name="username" value="${user}"/>
    <property name="password" value="${password}"/>
    <property name="clientMode" value="0"/>
    <property name="fileType" value="2"/>
    <property name="bufferSize" value="10000000"/>                  
</bean>

Java代码：

ConfigurableApplicationContext context = 
            new FileSystemXmlApplicationContext("/src/citrus/resources/citrus-context.xml");
final FtpFlowGateway ftpFlow = context.getBean(FtpFlowGateway.class);
ftpFlow.lsFiles("/");
PollableChannel channel = context.getBean("getFtpChannel", PollableChannel.class);
variable("tt", channel.receive().toString());
echo("${tt}");

输出：

11:09:17,169 INFO  port.LoggingReporter| Test action <echo>
11:09:17,169 INFO    actions.EchoAction| [Payload=FileInfo [isDirectory=false,  isLink=false, Size=3607, ModifiedTime=Tue Jul 15 14:18:00 CEST 2014,       Filename=Smoke03_angart30_st40.exi, RemoteDirectory=/, Permiss
ions=-rw-r--r--]][Headers= {replyChannel=org.springframework.integration.core.MessagingTemplate$TemporaryReplyChannel@7829b776, sequenceNumber=1,  errorChannel=org.springframework.integration.core.MessagingTempla
te$TemporaryReplyChannel@7829b776, file_remoteDirectory=/, sequenceSize=1, correlationId=49b57f2d-4dbf-4a89-b5b8-0dfb15bca2be, id=0a58ad65-74b4-4aae-87be- aa6034a41776, timestamp=1405501757060}]
11:09:17,169 INFO  port.LoggingReporter| Test action <echo> done
11:09:17,169 INFO  port.LoggingReporter| TEST STEP 1/1 done

输出很好，但是当我不知道FTP上存储了多少文件时，我该怎么做才能打印这些信息？（此代码仅打印一个文件）。我已经尝试检查channel.receive()是否为空但测试只是冻结。

Answer 1

由于您将LS的结果发送到<splitter>，您的getFtpChannel将逐个接收FileInfo<?>个对象。

要打印它们，你真的应该有一个无限循环：

while (true) {
  variable("tt", channel.receive().toString());
  echo("${tt}");
}

要停止应用，您应该提供一些shoutDownHook或从控制台输入中收听内容。

另一点是，使用无限receive()阻止您的应用是不好的。有一个na重载方法，它应用timeout参数。最后一个可能对确定循环结束很有用：

while (true) {
  Message<?> receive = channel.receive(10000);
  if (receive == null) {
      break;
  }
  variable("tt", receive.toString());
  echo("${tt}");
}

Answer 2

@Configuration
public class FtpConfig {

    @Bean
    public DefaultFtpSessionFactory ftpSessionFactory() {
        DefaultFtpSessionFactory ftpSessionFactory = new DefaultFtpSessionFactory();
        ftpSessionFactory.setHost("localhost");
        ftpSessionFactory.setPort(21);
        ftpSessionFactory.setUsername("user");
        ftpSessionFactory.setPassword("pass");
        return ftpSessionFactory;
    }

}

@Bean
public ApplicationRunner runner(DefaultFtpSessionFactory sf) {
   return args -> {
       FTPFile[] list = sf.getSession().list(".");
       for (FTPFile file: list ) {
           System.out.println("Result: " + file.getName());
       }
   };
}

使用spring-integration从ftp列出文件

2 个答案: