freemaker的标记语法
借Struts2核心jar包下的Filter包的error.ftl文件来学习一下freemaker的标记语法
该ftl模板（error.ftl）用于指示开发者Struts页面请求出错后，指定转向该模板所生成的html静态页面
<#--
/** $Id: error.ftl 720258 2008-11-24 19:05:16Z musachy $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
-->
<html>
<head>
<title>Struts Problem Report</title>
<style>
pre {
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<h2>Struts Problem Report</h2>
<p>
Struts has detected an unhandled exception:
</p>
<#assign msgs = [] />
<#list chain as ex>
<#if ex.message??>
<#assign msgs = [ex.message] + msgs/>
</#if>
</#list>
<#assign rootex = exception/>
<#list chain as ex>
<#if (ex.location?? && (ex.location != unknown))>
<#assign rootloc = ex.location/>
<#assign rootex = ex/>
<#else>
<#assign tmploc = locator.getLocation(ex) />
<#if (tmploc != unknown)>
<#assign rootloc = tmploc/>
<#assign rootex = ex/>
</#if>
</#if>
</#list>
<div id="exception-info">
<table>
<tr>
<td><strong>Messages</strong>:</td>
<td>
<#if (msgs?size > 1)>
<ol>
<#list msgs as msg>
<#if (msg?is_method)>
<li>${msg[0]}</li>
<#else>
<li>${msg}</li>
</#if>
</#list>
</ol>
<#elseif (msgs?size == 1)>
<#if (msgs[0]?is_method)>
<li>${msgs[0][0]}</li>
<#else>
<li>${msgs[0]}</li>
</#if>
</#if>
</td>
</tr>
<#if rootloc??>
<tr>
<td><strong>File</strong>:</td>
<td>${rootloc.URI}</td>
</tr>
<tr>
<td><strong>Line number</strong>:</td>
<td>${rootloc.lineNumber}</td>
</tr>
<#if (rootloc.columnNumber >= 0)>
<tr>
<td><strong>Column number</strong>:</td>
<td>${rootloc.columnNumber}</td>
</tr>
</#if>
</#if>
</table>
</div>
<#if rootloc??>
<#assign snippet = rootloc.getSnippet(2) />
<#if (snippet?size > 0)>
<div id="snippet">
<hr />
<#list snippet as line>
<#if (line_index == 2)>
<#if (rootloc.columnNumber >= 3)>
<pre style="background:yellow">${(line[0..(rootloc.columnNumber-3)]?html)}<span style="background:red">${(line[(rootloc.columnNumber-2)]?html)}</span><#if ((rootloc.columnNumber)<line.length())>${(line[(rootloc.columnNumber-1)..]?html)}</#if></pre>
<#else>
<pre style="background:yellow">${line?html}</pre>
</#if>
<#else>
<pre>${line?html}</pre>
</#if>
</#list>
</div>
</#if>
</#if>
<div id="stacktraces">
<hr />
<h3>Stacktraces</h3>
<#list chain as ex>
<div class="stacktrace" style="padding-left: ${ex_index * 2}em">
<strong>${ex}</strong>
<div>
<pre>
<#list ex.stackTrace as frame>
${frame}
</#list>
</pre>
</div>
</div>
</#list>
</div>
<div class="footer">
<hr />
<p>
You are seeing this page because development mode is enabled. Development mode, or devMode, enables extra
debugging behaviors and reports to assist developers. To disable this mode, set:
<pre>
struts.devMode=false
</pre>
in your <code>WEB-INF/classes/struts.properties</code> file.
</p>
</div>
</body>
</html>