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pgui_config_sharedvariables.html
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<!doctype html>
<html lang="en" class="page-type-section">
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<title>共享变量 - FreeMarker 手册</title>
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<h1 class="content-header header-section1" id="pgui_config_sharedvariables" itemprop="headline">共享变量</h1>
</div></div><p><strong>Shared variables</strong>
(共享变量)是为所有模板定义的变量。可以使用
<code class="inline-code">setSharedVariable</code> 方法向配置中添加共享变量：</p>
<div class="code-wrapper"><pre class="code-block code-unspecified">Configuration cfg = new Configuration(Configuration.VERSION_2_3_22);
<em>..</em>.
cfg.setSharedVariable("warp", new WarpDirective());
cfg.setSharedVariable("company", "Foo Inc.");</pre></div><p>在所有使用这个配置的模板中，名为 <code class="inline-code">wrap</code>
的用户自定义指令和一个名为 <code class="inline-code">company</code>
的字符串将会在数据模型的根root上可见，
那就不用在根哈希表上一次又一次的添加它们。在传递给
<code class="inline-code">Template.process</code> 的
根root对象里的变量将会隐藏同名的共享变量。</p> <div class="callout warning">
<strong class="callout-label">Warning!</strong>
<p>如果配置对象在多线程环境中使用，不要使用
<code class="inline-code">TemplateModel</code> 实现类来作为共享变量，
因为它是不是<a href="gloss.html#gloss.threadSafe">线程安全</a>的！
这也是基于Servlet应用程序的典型情形。</p>
</div>
<p>出于向后兼容的特性，共享变量的集合初始化时
(就是对于新的 <code class="inline-code">Configuration</code> 实例来说)不能为空。
它包含下列用户自定义指令(用户自定义指令使用时需要用
<code class="inline-code">@</code> 来代替<code class="inline-code">#</code>)：</p> <div class="table-responsive">
<table class="table">
<thead>
<tr>
<th>名称</th>
<th>类</th>
</tr>
</thead>
<tbody>
<tr>
<td><code class="inline-code">capture_output</code></td>
<td><code class="inline-code">freemarker.template.utility.CaptureOutput</code></td>
</tr>
<tr>
<td><code class="inline-code">compress</code></td>
<td><code class="inline-code">freemarker.template.utility.StandardCompress</code></td>
</tr>
<tr>
<td><code class="inline-code">html_escape</code></td>
<td><code class="inline-code">freemarker.template.utility.HtmlEscape</code></td>
</tr>
<tr>
<td><code class="inline-code">normalize_newlines</code></td>
<td><code class="inline-code">freemarker.template.utility.NormalizeNewlines</code></td>
</tr>
<tr>
<td><code class="inline-code">xml_escape</code></td>
<td><code class="inline-code">freemarker.template.utility.XmlEscape</code></td>
</tr>
</tbody>
</table>
</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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