In Camel how can i split a route using xpath on a header

问题

As the title suggests, i have a route with a header that contains some xml similar to the following snippet as a string;

<files>
  <image_file1>image.png</image_file1>
  <image_file2>image.png</image_file2>
</files>

What I'm trying do do is split via xpath using something like the following. As the following suggests when the xml is part of the body, all runs fine:-

from(myIncomingQueue)
    .convertBodyTo(String.class, "utf-8")
    .split(xpath("//*[local-name()='files']/*"))
        .setHeader("FilePropertyToRetrieve", xpath("local-name(//*)").stringResult())
        .to(myFileDownloadQueue)
.routeId("COMMON-CON-Attachment_Router-Id");

I found a solution using the following:-

from(myIncomingQueue)
    .setBody(header("myHeaderWithXml"))
    .convertBodyTo(String.class, "utf-8")
    .split(xpath("//*[local-name()='files']/*"))
        .setHeader("FilePropertyToRetrieve", xpath("local-name(//*)").stringResult())
        .setBody(header("CamelOriginalBody"))
        .to(myFileDownloadQueue)
.routeId("COMMON-CON-Attachment_Router-Id");

But would still like to know for learning purposes, if there is a way to do it without moving the header into the body and then reversing afterwards?

回答1:

Yes if you read the docs about xpath at: http://camel.apache.org/xpath - then see the section Using XPath on Headers

Something alike

  .split(xpath("//*[local-name()='files']/*", "myHeaderWithXml"))

来源：https://stackoverflow.com/questions/18483320/in-camel-how-can-i-split-a-route-using-xpath-on-a-header

标签

xpath

apache-camel