THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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
Maven users will need to add the following dependency to their pom.xml for this component:
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URI Format
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Where Where templateName is the classpath-local URI of the template to invoke; or the complete URL of the remote template.
You can append query options to the URI in the following format, ?option=value&option=value&...
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. The Resource is an org.springframework.core.io.Resource object.
Hot
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-Reloading
The string template resource is by default hot-reloadable for both file and classpath resources (expanded jar). If you set contentCache=true, Camel loads will load the resource only just once and , disabling hot-reloading is not possible. This scenario can be used in production when the resource never changes.
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Camel will provide exchange information as attributes (just a java.util.Map) to the string template. The Exchange is transfered transferred as:
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Key |
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Value | |
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| The Exchange itself. |
| The headers of |
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the | |
| The Camel Context. |
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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:
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This example works for camel 2.11.0. If your camel version is less than 2.11.0, the variables should be started and ended with $.
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And the java code is as follows:
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