使用apache camel从http位置下载

Question

I need to download a file from an http location to my local system using apache camel. When I gave the below code

    from("http://url/filename.xml")                         
    .to("file://C:location")  

it has worked for ftp but not working when the url is "http". That is, it is not downloading the file from the http location to the local address provided in the "to()".

Answer 1

the http component cannot be used as a consumer ie. you cannot have a route as from("http://...")

you need to use a consumer component that will start the route. You could try something like this

from("timer:foo?fixedRate=true&period=5000")
.to("http://url/filename.xml")                         
.to("file://C:location") 

Answer 2

This should work.

 from("direct:abc")
            .setHeader("Accept", simple("application/xml"))//Change it according to the file content
            .setHeader(Exchange.HTTP_METHOD, constant("GET"))
            .to("http://url/filename.xml")
            .to("file:///tmp/?fileName=yourFileName.xml");

You cannot use from("Some url") . Above route is triggered whenever there is a message on direct:abc endpoint. You can change the yourFileName.xml to whatever filename you want it to be stored as.

Instead of a trigger from route, you can as well use a timer or any other means of self triggering.

The reason you cannot consume from a rest enpoint like this

from("http://url/filename.xml")  

is you cannot consume from http endpoint. So there needs to be a trigger. Infact the exception message is pretty clear when you do like this. It says

org.apache.camel.spring.boot.CamelSpringBootInitializationException: org.apache.camel.FailedToCreateRouteException: Failed to create route route1: Route(route1)[[From[http://url/filename.xml]] -> [To[... because of Cannot consume from http endpoint