freemaker的标记语法 - JAVA

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.

-->

Struts Problem Report

Struts has detected an unhandled exception:

<#assign msgs = [] />

<#list chain as ex>

<#if ex.message >

<#assign msgs = [ex.message] + msgs/>

<#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 rootloc >

<#if (rootloc.columnNumber >= 0)>

Messages:	<#if (msgs size > 1)> <#list msgs as msg> <#if (msg is_method)> ${msg[0]} <#else> ${msg} <#elseif (msgs size == 1)> <#if (msgs[0] is_method)> ${msgs[0][0]} <#else> ${msgs[0]}
File:	${rootloc.URI}
Line number:	${rootloc.lineNumber}
Column number:	${rootloc.columnNumber}

<#if rootloc >

<#assign snippet = rootloc.getSnippet(2) />

<#if (snippet size > 0)>

<#list snippet as line>

<#if (line_index == 2)>

<#if (rootloc.columnNumber >= 3)>

${(line[0..(rootloc.columnNumber-3)] html)}${(line[(rootloc.columnNumber-2)] html)}<#if ((rootloc.columnNumber)${(line[(rootloc.columnNumber-1)..] html)}

<#else>

${line html}

<#else>

${line html}

Stacktraces

<#list chain as ex>

${ex}

<#list ex.stackTrace as frame>

${frame}

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:

struts.devMode=false

in your WEB-INF/classes/struts.properties file.