Spring Integration FTP Outbound Gateway console output - spring

Question

In the Spring Integration documentation example for ftp outbound gateway with Java configuration (16.8.1), how do I log the payload of the reply channel to the console?

Answer 1

Add a WireTap #Bean and wire its MessageChannel to a LoggingHandler.
Add the wire tap as a ChannelInterceptor to the gateway output channel.
Or, use the .wiretap() when using the Java DSL.
Documentation here.
EDIT
Java Config:
#SpringBootApplication
public class So49308064Application {
public static void main(String[] args) {
SpringApplication.run(So49308064Application.class, args);
}
#Bean
public ApplicationRunner runner (Gate gate) {
return args -> {
List<String> list = gate.list("foo");
System.out.println("Result:" + list);
};
}
#ServiceActivator(inputChannel = "ftpLS")
#Bean
public FtpOutboundGateway getGW() {
FtpOutboundGateway gateway = new FtpOutboundGateway(sf(), "ls", "payload");
gateway.setOption(Option.NAME_ONLY);
gateway.setOutputChannelName("results");
return gateway;
}
#Bean
public MessageChannel results() {
DirectChannel channel = new DirectChannel();
channel.addInterceptor(tap());
return channel;
}
#Bean
public WireTap tap() {
return new WireTap("logging");
}
#ServiceActivator(inputChannel = "logging")
#Bean
public LoggingHandler logger() {
LoggingHandler logger = new LoggingHandler(Level.INFO);
logger.setLogExpressionString("'Files:' + payload");
return logger;
}
#Bean
public DefaultFtpSessionFactory sf() {
DefaultFtpSessionFactory sf = new DefaultFtpSessionFactory();
sf.setHost("...");
sf.setUsername("...");
sf.setPassword("...");
return sf;
}
#MessagingGateway(defaultRequestChannel = "ftpLS", defaultReplyChannel = "results")
public interface Gate {
List<String> list(String directory);
}
}
.
2018-03-29 09:04:20.383 INFO 15158 --- [ main] o.s.integration.handler.LoggingHandler
: Files:bar.tx,bar.txt,baz.txt
Result:[bar.tx, bar.txt, baz.txt]
Java DSL:
#SpringBootApplication
public class So49308064Application {
public static void main(String[] args) {
SpringApplication.run(So49308064Application.class, args);
}
#Bean
public ApplicationRunner runner (Gate gate) {
return args -> {
List<String> list = gate.list("foo");
System.out.println("Result:" + list);
};
}
#Bean
public IntegrationFlow flow() {
return f -> f
.handle((Ftp.outboundGateway(sf(), "ls", "payload").options(Option.NAME_ONLY)))
.log(Level.INFO, "lsResult", "payload")
.bridge(); // needed, otherwise log ends the flow.
}
#Bean
public DefaultFtpSessionFactory sf() {
DefaultFtpSessionFactory sf = new DefaultFtpSessionFactory();
sf.setHost("...");
sf.setUsername("...");
sf.setPassword("...");
return sf;
}
#MessagingGateway(defaultRequestChannel = "flow.input")
public interface Gate {
List<String> list(String directory);
}
}
.
2018-03-29 09:12:28.991 INFO 16638 --- [ main] lsResult
: [bar.tx, bar.txt, baz.txt]
Result:[bar.tx, bar.txt, baz.txt]