StringTemplate

String Template

The string-template: component allows you to process a message using a String Template. This can be ideal when using Templating to generate responses for requests.

URI format

string-template:templateName

Where templateName is the classpath-local URI of the template to invoke; or the complete URL of the remote template.

Options

Headers

Camel will store a reference to the resource in the message header in the key org.apache.camel.stringtemplate.resource. The Resource is an org.springframework.core.io.Resource object.

Hot reloading

The stringtemplate resource is by default hot reloadable for both file and classpath resources (expanded jar). Setting the contentCache=true then Camel will only load the resource once, and thus hot reloading is not possible. This scenario can be used in production usage when the resource never changes.

StringTemplate Attributes

Camel will provide exchange information as attributes (just a Map) to the string template. The Exchange is transfered as:

Samples

For example you could use something like

from("activemq:My.Queue").
  to("string-template:com/acme/MyResponse.tm");

To use a string template to formulate a response for a message

The Email Sample

In this sample we want to use StringTemplate as templating for an order confirmation email. The email template is laid out in StringTemplate as:

Dear $headers.lastName$, $headers.firstName$
$body$

Thanks for the order of $headers.item$.

Regards Camel Riders Bookstore

And the java code: