Chapter 39. FreeMarker

FreeMarker
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The freemarker: component allows you to process a message using a FreeMarker template. This can be ideal when using Templating to generate responses for requests.

Maven users will need to add the following dependency to their pom.xml for this component:

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-freemarker</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-freemarker</artifactId>
    <version>x.x.x</version>
    <!-- use the same version as your Camel core version -->
</dependency>

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URI format
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freemarker:templateName[?options]

freemarker:templateName[?options]

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Where templateName is the classpath-local URI of the template to invoke; or the complete URL of the remote template (for example, file://folder/myfile.ftl).

You can append query options to the URI in the following format, ?option=value&option=value&...

Options
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Option	Default	Description
`contentCache`	`true`	Cache for the resource content when it's loaded. Note: as of Camel 2.9 cached resource content can be cleared via JMX using the endpoint's `clearContentCache` operation.
`encoding`	`null`	Character encoding of the resource content.
`templateUpdateDelay`	`5`	Camel 2.9: Number of seconds the loaded template resource will remain in the cache.

FreeMarker Context
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Apache Camel will provide exchange information in the FreeMarker context (just a Map). The Exchange is transferred as:

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Key	Value
`exchange`	The `Exchange` itself.
`exchange.properties`	The `Exchange` properties.
`headers`	The headers of the In message.
`camelContext`	The Camel Context.
`request`	The In message.
`body`	The In message body.
`response`	The Out message (only for InOut message exchange pattern).

Hot reloading
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The FreeMarker template resource is by default not hot reloadable for both file and classpath resources (expanded jar). If you set contentCache=false, then Apache Camel will not cache the resource and hot reloading is thus enabled. This scenario can be used in development.

Dynamic templates
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Available as of Camel 2.1 Camel provides two headers by which you can define a different resource location for a template or the template content itself. If any of these headers is set then Camel uses this over the endpoint configured resource. This allows you to provide a dynamic template at runtime.

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Header	Type	Description	Support Version
FreemarkerConstants.FREEMARKER_RESOURCE	org.springframework.core.io.Resource	The template resource	<= 1.6.2, <= 2.1
FreemarkerConstants.FREEMARKER_RESOURCE_URI	String	A URI for the template resource to use instead of the endpoint configured.	>= 2.1
FreemarkerConstants.FREEMARKER_TEMPLATE	String	The template to use instead of the endpoint configured.	>= 2.1

Samples
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For example, you can define a route like the following:

from("activemq:My.Queue").
  to("freemarker:com/acme/MyResponse.ftl");

from("activemq:My.Queue").
  to("freemarker:com/acme/MyResponse.ftl");

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To use a FreeMarker template to formulate a response to InOut message exchanges (where there is a JMSReplyTo header).

If you want to process InOnly exchanges, you could use a FreeMarker template to transform the message before sending it on to another endpoint:

from("activemq:My.Queue").
  to(ExchangePattern.InOut,"freemarker:com/acme/MyResponse.ftl").
  to("activemq:Another.Queue");

from("activemq:My.Queue").
  to(ExchangePattern.InOut,"freemarker:com/acme/MyResponse.ftl").
  to("activemq:Another.Queue");

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And to disable the content cache (for example, for development usage where the .ftl template should be hot reloaded):

from("activemq:My.Queue").
  to(ExchangePattern.InOut,"freemarker:com/acme/MyResponse.ftl?contentCache=false").
  to("activemq:Another.Queue");

from("activemq:My.Queue").
  to(ExchangePattern.InOut,"freemarker:com/acme/MyResponse.ftl?contentCache=false").
  to("activemq:Another.Queue");

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And for a file-based resource:

from("activemq:My.Queue").
  to(ExchangePattern.InOut,"freemarker:file://myfolder/MyResponse.ftl?contentCache=false").
  to("activemq:Another.Queue");

from("activemq:My.Queue").
  to(ExchangePattern.InOut,"freemarker:file://myfolder/MyResponse.ftl?contentCache=false").
  to("activemq:Another.Queue");

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In Camel 2.1 it's possible to specify what template the component should use dynamically via a header, so for example:

from("direct:in").
  setHeader(FreemarkerConstants.FREEMARKER_RESOURCE_URI).constant("path/to/my/template.ftl").
  to("freemarker:dummy");

from("direct:in").
  setHeader(FreemarkerConstants.FREEMARKER_RESOURCE_URI).constant("path/to/my/template.ftl").
  to("freemarker:dummy");

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

Dear ${headers.lastName}, ${headers.firstName}

Thanks for the order of ${headers.item}.

Regards Camel Riders Bookstore
${body}

Dear ${headers.lastName}, ${headers.firstName}

Thanks for the order of ${headers.item}.

Regards Camel Riders Bookstore
${body}

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And the java code:

private Exchange createLetter() {
    Exchange exchange = context.getEndpoint("direct:a").createExchange();
    Message msg = exchange.getIn();
    msg.setHeader("firstName", "Claus");
    msg.setHeader("lastName", "Ibsen");
    msg.setHeader("item", "Camel in Action");
    msg.setBody("PS: Next beer is on me, James");
    return exchange;
}

@Test
public void testFreemarkerLetter() throws Exception {
    MockEndpoint mock = getMockEndpoint("mock:result");
    mock.expectedMessageCount(1);
    mock.expectedBodiesReceived("Dear Ibsen, Claus\n\nThanks for the order of Camel in Action."
      + "\n\nRegards Camel Riders Bookstore\nPS: Next beer is on me, James");

    template.send("direct:a", createLetter());

    mock.assertIsSatisfied();
}

protected RouteBuilder createRouteBuilder() throws Exception {
    return new RouteBuilder() {
        public void configure() throws Exception {
            from("direct:a")
                .to("freemarker:org/apache/camel/component/freemarker/letter.ftl")
                .to("mock:result");
        }
    };
}

private Exchange createLetter() {
    Exchange exchange = context.getEndpoint("direct:a").createExchange();
    Message msg = exchange.getIn();
    msg.setHeader("firstName", "Claus");
    msg.setHeader("lastName", "Ibsen");
    msg.setHeader("item", "Camel in Action");
    msg.setBody("PS: Next beer is on me, James");
    return exchange;
}

@Test
public void testFreemarkerLetter() throws Exception {
    MockEndpoint mock = getMockEndpoint("mock:result");
    mock.expectedMessageCount(1);
    mock.expectedBodiesReceived("Dear Ibsen, Claus\n\nThanks for the order of Camel in Action."
      + "\n\nRegards Camel Riders Bookstore\nPS: Next beer is on me, James");

    template.send("direct:a", createLetter());

    mock.assertIsSatisfied();
}

protected RouteBuilder createRouteBuilder() throws Exception {
    return new RouteBuilder() {
        public void configure() throws Exception {
            from("direct:a")
                .to("freemarker:org/apache/camel/component/freemarker/letter.ftl")
                .to("mock:result");
        }
    };
}

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이 콘텐츠는 선택한 언어로 제공되지 않습니다.

FreeMarker
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URI format
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Options
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FreeMarker Context
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Hot reloading
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Dynamic templates
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Samples
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The Email Sample
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이 콘텐츠는 선택한 언어로 제공되지 않습니다.

Chapter 39. FreeMarker

FreeMarker링크 복사링크가 클립보드에 복사되었습니다!

URI format링크 복사링크가 클립보드에 복사되었습니다!

Options링크 복사링크가 클립보드에 복사되었습니다!

FreeMarker Context링크 복사링크가 클립보드에 복사되었습니다!

Hot reloading링크 복사링크가 클립보드에 복사되었습니다!

Dynamic templates링크 복사링크가 클립보드에 복사되었습니다!

Samples링크 복사링크가 클립보드에 복사되었습니다!

The Email Sample링크 복사링크가 클립보드에 복사되었습니다!

자세한 정보

평가판, 구매 및 판매

커뮤니티

Red Hat 문서 정보

보다 포괄적 수용을 위한 오픈 소스 용어 교체

Red Hat 소개

Theme

Red Hat legal and privacy links

Red Hat legal and privacy links

FreeMarker
링크 복사

URI format
링크 복사

Options
링크 복사

FreeMarker Context
링크 복사

Hot reloading
링크 복사

Dynamic templates
링크 복사

Samples
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The Email Sample
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