<s:radio>标签和<s:checkboxlist>标签实现换行

系统定义的时候默认为横向输排列，但我们有时候需要竖向排列，实现竖向排列的方法有两种，第一种可以在标签外面加一个<div>或者<span>标签，设置它们的宽度，但是这样显示效果不是很好控制，所以我喜欢用第二种，修改ftl模版文件。

首先在struts2-core-xxx.jar 的template.simple里面找到checkboxlist.ftl，然后在自己项目里新建一个包 名字为template.simple，把checkboxlist.ftl文件拷贝过来，最后就在这里面重新定义自己想要显示的格式，我设置的是一行显示一个，代码如下：

<#--
/*
* $Id: checkboxlist.ftl 1366934 2012-07-29 20:10:06Z jogep $
*
* 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.
*/
-->
<#assign itemCount = 0/>
<#if parameters.list??>
<@s.iterator value="parameters.list">
<#assign itemCount = itemCount + 1/>
<#if parameters.listKey??>
<#assign itemKey = stack.findValue(parameters.listKey)/>
<#else>
<#assign itemKey = stack.findValue('top')/>
</#if>
<#if parameters.listValue??>
<#assign itemValue = stack.findString(parameters.listValue)?default("")/>
<#else>
<#assign itemValue = stack.findString('top')/>
</#if>
<#if parameters.listCssClass??>
<#if stack.findString(parameters.listCssClass)??>
<#assign itemCssClass= stack.findString(parameters.listCssClass)/>
<#else>
<#assign itemCssClass = ''/>
</#if>
</#if>
<#if parameters.listCssStyle??>
<#if stack.findString(parameters.listCssStyle)??>
<#assign itemCssStyle= stack.findString(parameters.listCssStyle)/>
<#else>
<#assign itemCssStyle = ''/>
</#if>
</#if>
<#if parameters.listTitle??>
<#if stack.findString(parameters.listTitle)??>
<#assign itemTitle= stack.findString(parameters.listTitle)/>
<#else>
<#assign itemTitle = ''/>
</#if>
</#if>
<#assign itemKeyStr=itemKey.toString() />
<span>${itemCount}.<span/>
<input type="checkbox" name="${parameters.name?html}" value="${itemKeyStr?html}"
id="${parameters.name?html}-${itemCount}"<#rt/>
<#if tag.contains(parameters.nameValue, itemKey)>
checked="checked"<#rt/>
</#if>
<#if parameters.disabled?default(false)>
disabled="disabled"<#rt/>
</#if>
<#if itemCssClass?if_exists != "">
class="${itemCssClass?html}"<#rt/>
<#else>
<#if parameters.cssClass??>
class="${parameters.cssClass?html}"<#rt/>
</#if>
</#if>
<#if itemCssStyle?if_exists != "">
style="${itemCssStyle?html}"<#rt/>
<#else>
<#if parameters.cssStyle??>
style="${parameters.cssStyle?html}"<#rt/>
</#if>
</#if>
<#if itemTitle?if_exists != "">
title="${itemTitle?html}"<#rt/>
<#else>
<#if parameters.title??>
title="${parameters.title?html}"<#rt/>
</#if>
</#if>
<#include "/${parameters.templateDir}/simple/css.ftl" />
<#include "/${parameters.templateDir}/simple/scripting-events.ftl" />
<#include "/${parameters.templateDir}/simple/common-attributes.ftl" />
/>
<label for="${parameters.name?html}-${itemCount}" class="checkboxLabel">${itemValue?html}</label>
<#if (itemCount-1)%1 == 0>
<br/><br/>
</#if>
</@s.iterator>
<#else>

</#if>
<input type="hidden" id="__multiselect_${parameters.id?html}" name="__multiselect_${parameters.name?html}"
value=""<#rt/>
<#if parameters.disabled?default(false)>
disabled="disabled"<#rt/>
</#if>
/>