THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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String
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Template
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The
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string-template:
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component
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allows
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you
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to
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process
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a
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message
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using
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a
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...
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.
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This
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can
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be
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ideal
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when
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using
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to
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generate
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responses
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for
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requests.
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Maven
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users
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will
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need
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to
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add
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the
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following
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dependency
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to
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their
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pom.xml
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for
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this
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component:
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URI Format
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Where templateName is the classpath-local
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URI
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of
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the
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template
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to
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invoke;
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or
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the
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complete
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URL
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of
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the
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remote
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template.
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You
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can
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append
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query
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options
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to
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the
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URI
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in
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the
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following
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format,
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?option=value&option=value&...
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Options
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Option | Default | Description |
|---|---|---|
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| Cache for the resource content when its loaded. |
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| From Camel 2.11.1: configuring the variable start delimiter |
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| From Camel 2.11.1: configuring the variable end delimiter |
Headers
Camel will store a reference to the resource in the message header with key, org.apache.camel.stringtemplate.resource
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.
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The
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Resource
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is
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an
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org.springframework.core.io.Resource
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object.
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Hot-Reloading
The string template resource is by default hot-reloadable
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for
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both
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file
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and
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classpath
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resources
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(expanded
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jar).
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If
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you
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set
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contentCache=true
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,
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Camel
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will load the
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resource
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just once, disabling hot-reloading
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.
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This
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scenario
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can
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be
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used
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in
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production
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when
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the
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resource
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never
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changes.
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StringTemplate
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Attributes
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Camel
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will
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provide
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exchange
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information
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as
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attributes
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(just
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a
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java.util.Map
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)
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to
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the
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string
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template.
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The
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Exchange
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is
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transferred as:
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Key | Value |
|---|---|
| The Exchange itself. |
| The headers of the |
| The Camel Context. |
| The |
| The |
| The |
| The |
| The |
From Camel 2.14: you can define the custom context map by setting the message header CamelStringTemplateVariableMap, as shown below:
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Samples
For example you could use a string template as follows in order to formulate a response to a message:
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The Email Sample
In this sample we want to use a string template to send an order confirmation email. The email template is laid out in StringTemplate as:
This example works for camel 2.11.0
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.
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If
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your
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camel
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version
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is
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less
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than
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2.11.0,
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the
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variables
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should
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be
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started
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and
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ended
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with
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$.
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And the java code is as follows:
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