[Java] Class SimpleTemplateEngine
- groovy.text.SimpleTemplateEngine
Processes template source files substituting variables and expressions into placeholders in a template source text to produce the desired output.
The template engine uses JSP style <% %> script and <%= %> expression syntax or GString style expressions. The variable 'out
' is bound to the writer that the template is being written to.
Frequently, the template source will be in a file but here is a simple example providing the template as a string:
def binding = [ firstname : "Grace", lastname : "Hopper", accepted : true, title : 'Groovy for COBOL programmers' ] def engine = new groovy.text.SimpleTemplateEngine() def text = '''\ Dear <%= firstname %> $lastname, We <% if (accepted) print 'are pleased' else print 'regret' %> \ to inform you that your paper entitled '$title' was ${ accepted ? 'accepted' : 'rejected' }. The conference committee. ''' def template = engine.createTemplate(text).make(binding) println template.toString()This example uses a mix of the JSP style and GString style placeholders but you can typically use just one style if you wish. Running this example will produce this output:
Dear Grace Hopper, We are pleased to inform you that your paper entitled 'Groovy for COBOL programmers' was accepted. The conference committee.The template engine can also be used as the engine for TemplateServlet by placing the following in your
web.xml
file (plus a corresponding servlet-mapping element): <servlet> <servlet-name>SimpleTemplate</servlet-name> <servlet-class>groovy.servlet.TemplateServlet</servlet-class> <init-param> <param-name>template.engine</param-name> <param-value>groovy.text.SimpleTemplateEngine</param-value> </init-param> </servlet>In this case, your template source file should be HTML with the appropriate embedded placeholders.
Properties Summary
Type | Name and description |
---|---|
boolean |
escapeBackslash |
boolean |
verbose |
Constructor Summary
Constructor and description |
---|
SimpleTemplateEngine
() |
SimpleTemplateEngine
(boolean verbose) |
SimpleTemplateEngine
(ClassLoader parentLoader) |
SimpleTemplateEngine
(GroovyShell groovyShell) |
Methods Summary
Type Params | Return Type | Name and description |
---|---|---|
Template |
createTemplate(Reader reader) | |
boolean |
isEscapeBackslash() | |
boolean |
isVerbose() | |
void |
setEscapeBackslash(boolean escapeBackslash) | |
void |
setVerbose(boolean verbose) @param verbose true if you want the engine to display the template source file for debugging purposes |
Inherited Methods Summary
Methods inherited from class | Name |
---|---|
class TemplateEngine | createTemplate, createTemplate, createTemplate, createTemplate |
Property Detail
boolean escapeBackslash
boolean verbose
Constructor Detail
public SimpleTemplateEngine()
public SimpleTemplateEngine(boolean verbose)
public SimpleTemplateEngine(ClassLoader parentLoader)
public SimpleTemplateEngine(GroovyShell groovyShell)
Method Detail
public Template createTemplate(Reader reader)
public boolean isEscapeBackslash()
public boolean isVerbose()
public void setEscapeBackslash(boolean escapeBackslash)
public void setVerbose(boolean verbose)
- Parameters:
-
verbose
- true if you want the engine to display the template source file for debugging purposes
© 2003-2020 The Apache Software Foundation
Licensed under the Apache license.
https://docs.groovy-lang.org/2.5.14/html/gapi/groovy/text/SimpleTemplateEngine.html