map freemarker遍历
fremarker中map的key必须是String，否则无法取到value。
（1）map<String,基本数据类型>
<#if clientSourceData?exists>
<#list clientSourceData?keys as key>
<tr>
<td>${key}</td>
<td>${clientSourceData【key】}</td>
</tr>
</#list>
</#if>
（2）map<String,javaBean>
<#list clientSourceData?keys as key>
<tr>
<td>${key}</td>
<td>${clientSourceData[key].id}</td>
</tr>
</#list>
（3）map<String,List<Javabean>>
<#list clientSourceData?keys as key>
<tr>
<td>${key}</td>
</tr>
<tr>
<td>
<table>
<#list clientSourceData[key] as data>
<tr>
<td>${data.id}</td>
</tr>
</#list>
</table>
</td>
</tr>
</#list>
原文：http://my.oschina.net/cavaliersyb/blog/473018