Linux 上的 Apache Camel 文件 IO

Question

I have been trying to set up a simple program to read in a file and write to a separate file using Apache Camel, and after googling how to and reading the documentation, I have come up with the following

public static void main(String[] argv) {
    CamelContext context = new DefaultCamelContext();
    RouteBuilder route = new RouteBuilder() {
        @Override
        public void configure() throws Exception {
             from("file:/home/user/?fileName=temp.txt&charset=UTF-8&noop=true")
             .to("/home/user/?fileName=tempOut.txt&charset=UTF-8");
        }
    }

    context.addRoutes(route);
    context.start();
    context.stop();
}

and the console output is as follows

[main] INFO org.apache.camel.impl.DefaultCamelContext - Apache Camel 2.11.1 (CamelContext: camel-1) is starting
[main] INFO org.apache.camel.management.ManagementStrategyFactory - JMX enabled.
[main] INFO org.apache.camel.impl.converter.DefaultTypeConverter - Loaded 172 type converters
[main] INFO org.apache.camel.component.file.FileEndpoint - Endpoint is configured with noop=true so forcing endpoint to be idempotent as well
[main] INFO org.apache.camel.component.file.FileEndpoint - Using default memory based idempotent repository with cache max size: 1000
[main] INFO org.apache.camel.impl.DefaultCamelContext - Route: route1 started and consuming from: Endpoint[file:///home/justin/?charset=utf-8&fileName=temp1.txt&noop=true]
[main] INFO org.apache.camel.management.DefaultManagementLifecycleStrategy - Load performance statistics enabled.
[main] INFO org.apache.camel.impl.DefaultCamelContext - Total 1 routes, of which 1 is started.
[main] INFO org.apache.camel.impl.DefaultCamelContext - Apache Camel 2.11.1 (CamelContext: camel-1) started in 0.680 seconds
[main] INFO org.apache.camel.impl.DefaultCamelContext - Apache Camel 2.11.1 (CamelContext: camel-1) is shutting down
[main] INFO org.apache.camel.impl.DefaultShutdownStrategy - Starting to graceful shutdown 1 routes (timeout 300 seconds)
[Camel (camel-1) thread #2 - ShutdownTask] INFO org.apache.camel.impl.DefaultShutdownStrategy - Route: route1 shutdown complete, was consuming from: Endpoint[file:///home/justin/?charset=utf-8&fileName=temp1.txt&noop=true]
[main] INFO org.apache.camel.impl.DefaultShutdownStrategy - Graceful shutdown of 1 routes completed in 0 seconds
[main] INFO org.apache.camel.impl.DefaultCamelContext - Apache Camel 2.11.1 (CamelContext: camel-1) uptime 0.759 seconds
[main] INFO org.apache.camel.impl.DefaultCamelContext - Apache Camel 2.11.1 (CamelContext: camel-1) is shutdown in 0.032 seconds

However I get no resulting tempOut.txt anywhere (at least that would make sense to me) on my disk. My question is why is that? also I have noticed that in the console output it says " ...consuming from: Endpoint[file:///home/... where are the extra / 's coming from as I do not have them in the file path?

Answer 1

Try to remove the context.stop(); from your class.

You immediately shut down Camel after you started it. Therefore the file consumer has only little chance to scan the directory and process the files.

To the slashes: file:// is the beginning of a file URL, just like http:// . And your file path starts with a / too because it is absolute. Therefore you got three slashes.

Answer 2

use spring-boot to run it as web application or keep the main thread blocked so that Camel stays up with below setting

camel: springboot: main-run-controller: 'true'