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pgui_quickstart_merge.html
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<!doctype html>
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<title>合并模板和数据模型 - FreeMarker 手册</title>
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<h1 class="content-header header-section1" id="pgui_quickstart_merge" itemprop="headline">合并模板和数据模型</h1>
</div></div><p>我们已经知道，数据模型+模板=输出，我们有了一个数据模型
(<code class="inline-code">root</code>) 和一个模板 (<code class="inline-code">temp</code>)，
为了得到输出就需要合并它们。这是由模板的 <code class="inline-code">process</code>
方法完成的。它用数据模型root和 <code class="inline-code">Writer</code>
对象作为参数，然后向 <code class="inline-code">Writer</code> 对象写入产生的内容。
为简单起见，这里我们只做标准的输出：</p>
<div class="code-wrapper"><pre class="code-block code-unspecified">Writer out = new OutputStreamWriter(System.out);
temp.process(root, out);</pre></div><p>这会向你的终端输出你在模板开发指南部分的 <a href="dgui_quickstart_basics.html#example.first">第一个示例</a> 中看到的内容。</p><p>Java I/O 相关注意事项：基于 <code class="inline-code">out</code> 对象，必须保证
<code class="inline-code">out.close()</code> 最后被调用。当 <code class="inline-code">out</code>
对象被打开并将模板的输出写入文件时，这是很电影的做法。其它时候，
比如典型的Web应用程序，那就 <em>不能</em> 关闭
<code class="inline-code">out</code> 对象。FreeMarker 会在模板执行成功后
(也可以在 <code class="inline-code">Configuration</code> 中禁用)
调用 <code class="inline-code">out.flush()</code>，所以不必为此担心。</p><p>请注意，一旦获得了 <code class="inline-code">Template</code> 实例，
就能将它和不同的数据模型进行不限次数
(<code class="inline-code">Template</code>实例是无状态的)的合并。此外，
当 <code class="inline-code">Template</code> 实例创建之后
<code class="inline-code">test.ftl</code> 文件才能访问，而不是在调用处理方法时。</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>
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<time itemprop="dateModified" datetime="2015-09-18T14:38:51Z" title="Friday, September 18, 2015 2:38:51 PM GMT">2015-09-18 14:38:51 GMT</time></span></p> <p class="copyright">
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