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Template framework

The template framework in Groovy consists of a TemplateEngine abstract base class that engines must
implement and a Template interface that the resulting templates they generate must implement.

Included with Groovy is the SimpleTemplateEngine that allows you to use JSP-like scriptlets, script, and EL expressions in your template in order to generate parametrized text. Here is an example of using the system:

Error rendering macro 'code': Invalid value specified for parameter 'lang'
import groovy.text.Template
import groovy.text.SimpleTemplateEngine

def text = 'Dear \"${firstname} ${lastname}\",\nSo nice to meet you in <% print city %>.\nSee you in ${month},\n${signed}'

def binding = ["firstname":"Sam", "lastname":"Pullara", "city":"San Francisco", "month":"December", "signed":"Groovy-Dev"]

def engine = new SimpleTemplateEngine()
template = engine.createTemplate(text).make(binding)

def result = 'Dear "Sam Pullara",\nSo nice to meet you in San Francisco.\nSee you in December,\nGroovy-Dev'

assert result == template.toString()

Though its possible to plug in any kind of template engine dialect, we can share the same API to invoke templates. e.g. we could create a Velocity / FreeMarker flavour TemplateEngine implemenation which could reuse GPath and auto-recompile to bytecode.

Using TemplateServlet to serve single JSP-like HTML files

Here is a simple example helloworld.html file which is not validating and does not have an head element. But it demonstrates, how to let Groovy compile and serve your HTML files to web clients. The tag syntax close to JSP and should be easy to read:

Further reading

Article on templating with Groovy templates by Andrew Glover

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