Camel: Splitting a collection and writing to files

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滥情空心 2021-02-08 05:55

I´m trying to split an ArrayList and writing each element to it´s own file using Apache Camel like in this simplified example:

from(\"timer://poll?period=10000\"         


        
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  • 2021-02-08 06:30

    After you called split function, your route is divided in 3 ways, each method or route executed after that is applied on each process way.

    In each process way, split method add CamelSplitIndex property.

    So this code should work

    from("timer://poll?period=10000").process(new Processor(){
        public void process(Exchange exchange){
            ArrayList<String> list = new ArrayList<String>();
            list.add("one");
            list.add("two");
            list.add("three");
            exchange.getIn().setBody(list, ArrayList.class);
        }
    }).split(body()).log(body().toString()).to("file:some/dir?fileName=${header.CamelSplitIndex}");
    

    This is second example with xml file and xpath.

    We suppose that you want to explose xml for each node order with an element name inside:

    <orders>
      <order>
        <name>Order 1</name>
      </order>
      <order>
        <name>Order 2</name>
      </order>
    </order>
    

    We suppose that we want to explode this xml file in 2 files

    from("file://repo-source").split(xpath("//orders/order")).setHeader("orderName", xpath("/order/name").stringResult()).to("file://repo?fileName=${header.orderName}.xml");
    
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  • 2021-02-08 06:51

    The file producer will by default "override" if a file already exists.

    See the fileExist option at its documentation page http://camel.apache.org/file2

    Since the input to this route is also a file, then the producer will "inherit" the file name from the input.

    So in your case if you want to save each splitted message in a new file, then you would need to set a target file name, using the fileName option

    "file:some/dir?fileName=splitted-${id}"
    

    The fileName option supports the simple and file language

    http://camel.apache.org/simple.html

    http://camel.apache.org/file-language.html

    That means the file name can be dynamic computed, such as above, where ${id} is an unique message id.

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