java如何生成这样的xml文件

Question

?xml version="1.0" encoding="UTF-8"?>
<survey><!-- 调查有多个题目，每个题目下有多个答案 -->
<basic_info>
<id>111</id>
<name>调查</name>
<start_date>2010-04-30</start_date>
<end_date>2010-04-30</end_date>
</basic_info>
<questions>
<question>
<id>222</id>
<name>题目一</name>
<type>S</type><!-- 单选或多选 --><!-- S：单选；M：多选 -->
<answers>
<answer>
<id>333</id>
<name>答案一</name>
</answer>
</ansers>
</question>
<question>
<id>444</id>
<name>题目二</name>
<type>M</type><!-- 单选或多选 --><!-- S：单选；M：多选 -->
<answers>
<answer>
<id>555</id>
<name>答案一</name>
</answer>
<answer>
<id>666</id>
<name>答案二</name>
</answer>
</ansers>
</question>
</questions>
</survey>

Answer 1

http://blog.csdn.net/xuhuanchao/archive/2010/02/06/5293625.aspx