blob: d3aaf5523e0924d6dd0bd4c4168e25c464fca99e [file] [log] [blame]
<!doctype html>
<!-- Generated by FreeMarker/Docgen from DocBook -->
<html lang="en" class="page-type-section">
<head prefix="og: http://ogp.me/ns#">
<meta charset="utf-8">
<title>Merging the template with the data-model - Apache FreeMarker Manual</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width,initial-scale=1">
<meta name="format-detection" content="telephone=no">
<meta property="og:site_name" content="Apache FreeMarker Manual">
<meta property="og:title" content="Merging the template with the data-model">
<meta property="og:locale" content="en_US">
<meta property="og:url" content="https://freemarker.apache.org/docs/pgui_quickstart_merge.html">
<link rel="canonical" href="https://freemarker.apache.org/docs/pgui_quickstart_merge.html">
<link rel="icon" href="favicon.png" type="image/png">
<link rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/css?family=Roboto:500,700,400,300|Droid+Sans+Mono">
<link rel="stylesheet" type="text/css" href="docgen-resources/docgen.min.css?1707770044859">
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/cookie-bar/cookiebar-latest.min.js"></script>
</head>
<body itemscope itemtype="https://schema.org/Code">
<meta itemprop="url" content="https://freemarker.apache.org/docs/">
<meta itemprop="name" content="Apache FreeMarker Manual">
<!--[if lte IE 9]>
<div class="oldBrowserWarning" style="display: block">
Unsupported web browser - Use a modern browser to view this website!
</div>
<![endif]--> <div class="oldBrowserWarning">
Unsupported web browser - Use a modern browser to view this website!
</div>
<div class="header-top-bg"><div class="site-width header-top"><div id="hamburger-menu" role="button"></div> <div class="logo">
<a href="https://freemarker.apache.org" role="banner"><img itemprop="image" src="logo.png" alt="FreeMarker"></a> </div>
<ul class="tabs"><li><a href="https://freemarker.apache.org/">Home</a></li><li class="current"><a href="index.html">Manual</a></li><li><a class="external" href="api/index.html">Java API</a></li></ul><ul class="secondary-tabs"><li><a class="tab icon-heart" href="https://freemarker.apache.org/contribute.html" title="Contribute"><span>Contribute</span></a></li><li><a class="tab icon-bug" href="https://issues.apache.org/jira/projects/FREEMARKER" title="Report a Bug"><span>Report a Bug</span></a></li><li><a class="tab icon-download" href="https://freemarker.apache.org/freemarkerdownload.html" title="Download"><span>Download</span></a></li></ul></div></div><div class="header-bottom-bg"><div class="site-width search-row"><a href="index.html" class="navigation-header">Manual</a><div class="navigation-header"></div><form method="get" class="search-form" action="search-results.html"><fieldset><legend class="sr-only">Search form</legend><label for="search-field" class="sr-only">Search query</label><input id="search-field" name="q" type="search" class="search-input" placeholder="Search" spellcheck="false" autocorrect="off" autocomplete="off"><button type="submit" class="search-btn"><span class="sr-only">Search</span></button></fieldset></form></div><div class="site-width breadcrumb-row"> <div class="breadcrumbs">
<ul class="breadcrumb" itemscope itemtype="http://schema.org/BreadcrumbList"><li class="step-0" itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"><a class="label" itemprop="item" href="index.html"><span itemprop="name">Apache FreeMarker Manual</span></a></li><li class="step-1" itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"><a class="label" itemprop="item" href="pgui.html"><span itemprop="name">Programmer&#39;s Guide</span></a></li><li class="step-2" itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"><a class="label" itemprop="item" href="pgui_quickstart.html"><span itemprop="name">Getting Started</span></a></li><li class="step-3" itemprop="itemListElement" itemscope itemtype="http://schema.org/ListItem"><a class="label" itemprop="item" href="pgui_quickstart_merge.html"><span itemprop="name">Merging the template with the data-model</span></a></li></ul> </div>
<div class="bookmarks" title="Bookmarks"><span class="sr-only">Bookmarks:</span><ul><li><a href="alphaidx.html">Alpha. index</a></li><li><a href="gloss.html">Glossary</a></li><li><a href="dgui_template_exp.html#exp_cheatsheet">Expressions</a></li><li><a href="ref_builtins_alphaidx.html">?builtins</a></li><li><a href="ref_directive_alphaidx.html">#directives</a></li><li><a href="ref_specvar.html">.spec_vars</a></li><li><a href="app_faq.html">FAQ</a></li></ul></div></div></div> <div class="main-content site-width">
<div class="content-wrapper">
<div id="table-of-contents-wrapper" class="col-left">
<script>var breadcrumb = ["Apache FreeMarker Manual","Programmer\'s Guide","Getting Started","Merging the template with the data-model"];</script>
<script src="toc.js?1707770044859"></script>
<script src="docgen-resources/main.min.js?1707770044859"></script>
</div>
<div class="col-right"><div class="page-content"><div class="page-title"><div class="pagers top"><a class="paging-arrow previous" href="pgui_quickstart_gettemplate.html"><span>Previous</span></a><a class="paging-arrow next" href="pgui_quickstart_all.html"><span>Next</span></a></div><div class="title-wrapper">
<h1 class="content-header header-section1" id="pgui_quickstart_merge" itemprop="headline">Merging the template with the data-model</h1>
</div></div><p>As you might already know, data-model + template = output. We
already have a data-model (<code class="inline-code">root</code>) and a template
(<code class="inline-code">temp</code>), so to get the output we have to merge them.
This is done by the <code class="inline-code">process</code> method of the template.
It takes the data-model root and a <code class="inline-code">Writer</code> as
parameters. It writes the produced output to the
<code class="inline-code">Writer</code>. For the sake of simplicity here I write to
the standard output:</p>
<div class="code-block role-unspecified">
<pre class="code-block-body">Writer out = new OutputStreamWriter(System.out);
temp.process(root, out);</pre> </div>
<p>This will print to your terminal the output you have seen in the
<a href="dgui_quickstart_basics.html#example.first">first example</a> of the Template
Author&#39;s Guide.</p><p>Java I/O related notes: Depending on what <code class="inline-code">out</code>
is, you may need to ensure that <code class="inline-code">out.close()</code> is
called. This is typically needed when <code class="inline-code">out</code> writes
into a file that was opened to store the output of the template. In
other times, like in typical Web applications, you must
<em>not</em> close <code class="inline-code">out</code>. FreeMarker
calls <code class="inline-code">out.flush()</code> after a successful template
execution (but tis can be disabled in
<code class="inline-code">Configuration</code>), so you don&#39;t need to worry about
that.</p><p>Note that once you have obtained a <code class="inline-code">Template</code>
instance, you can merge it with different data-models for unlimited
times (<code class="inline-code">Template</code> instances are stateless). Also, the
<code class="inline-code">test.ftlh</code> file is accessed only while the
<code class="inline-code">Template</code> instance is created, not when you call the
process method.</p><div class="bottom-pagers-wrapper"><div class="pagers bottom"><a class="paging-arrow previous" href="pgui_quickstart_gettemplate.html"><span>Previous</span></a><a class="paging-arrow next" href="pgui_quickstart_all.html"><span>Next</span></a></div></div></div></div> </div>
</div>
<div class="site-footer"><div class="site-width"><div class="footer-top"><div class="col-left sitemap"><div class="column"><h3 class="column-header">Overview</h3><ul><li><a href="https://freemarker.apache.org/">What is FreeMarker?</a></li><li><a href="https://freemarker.apache.org/freemarkerdownload.html">Download</a></li><li><a href="app_versions.html">Version history</a></li><li><a href="app_faq.html">FAQ</a></li><li><a itemprop="license" href="app_license.html">License</a></li><li><a href="https://privacy.apache.org/policies/privacy-policy-public.html">Privacy policy</a></li></ul></div><div class="column"><h3 class="column-header">Often used / Reference</h3><ul><li><a href="https://try.freemarker.apache.org/">Try template online</a></li><li><a href="dgui_template_exp.html#exp_cheatsheet">Expressions cheatsheet</a></li><li><a href="ref_directive_alphaidx.html">#directives</a></li><li><a href="ref_builtins_alphaidx.html">?built_ins</a></li><li><a href="ref_specvar.html">.special_vars</a></li><li><a href="api/freemarker/core/Configurable.html#setSetting-java.lang.String-java.lang.String-">Configuration settings</a></li></ul></div><div class="column"><h3 class="column-header">Community</h3><ul><li><a href="https://github.com/apache/freemarker">Github project page</a></li><li><a href="https://issues.apache.org/jira/projects/FREEMARKER">Report a bug</a></li><li><a href="https://freemarker.apache.org/report-security-vulnerabilities.html">Report security vulnerability</a></li><li><a href="https://stackoverflow.com/questions/ask?tags=freemarker">Get help on StackOverflow</a></li><li><a href="https://twitter.com/freemarker">Announcements on Twitter</a></li><li><a href="https://freemarker.apache.org/mailing-lists.html">Discuss on mailing lists</a></li></ul></div></div><div class="col-right"><ul class="social-icons"><li><a class="github" href="https://github.com/apache/freemarker">Github</a></li><li><a class="twitter" href="https://twitter.com/freemarker">Twitter</a></li><li><a class="stack-overflow" href="https://stackoverflow.com/questions/ask?tags=freemarker">Stack Overflow</a></li></ul><a class="xxe" href="http://www.xmlmind.com/xmleditor/" rel="nofollow" title="Edited with XMLMind XML Editor"><span>Edited with XMLMind XML Editor</span></a></div></div><div class="footer-bottom"> <p class="last-generated">
Last generated:
<time itemprop="dateModified" datetime="2024-02-12T20:34:04Z" title="Monday, February 12, 2024 at 8:34:04 PM Greenwich Mean Time">2024-02-12 20:34:04 GMT</time>, for Freemarker 2.3.32 </p>
<p class="copyright">
© <span itemprop="copyrightYear">1999</span>–2024
<a itemtype="http://schema.org/Organization" itemprop="copyrightHolder" href="https://apache.org/">The Apache Software Foundation</a>. Apache FreeMarker, FreeMarker, Apache Incubator, Apache, the Apache FreeMarker logo are trademarks of The Apache Software Foundation. All other marks mentioned may be trademarks or registered trademarks of their respective owners. </p>
</div></div></div></body>
</html>