JSP如何将HTML的表单数据提交生成一个XML文件

求思路和具体编程语句，可以加分！！！急求！！！

JSP将HTML的表单数据提交生成一个XML文件的方法：
1、定义表单，封装id，firstName和lastName
<form:form modelAttribute="person">
<form:hidden path="id" />
<fieldset>
<div class="form-row">
<label for="firstName"><fmt:message key="person.form.firstName"/>:</label>
<span class="input"><form:input path="firstName" /></span>
</div>
<div class="form-row">
<label for="lastName"><fmt:message key="person.form.lastName"/>:</label>
<span class="input"><form:input path="lastName" /></span>
</div>
<div class="form-buttons">
<div class="button">
<input type="submit" id="save" name="_eventId_save" value="<fmt:message key="button.save"/>"/> 
<input type="submit" name="_eventId_cancel" value="Cancel"/> 
</div>
</div>
</fieldset>
</form:form>

2、提交到servlet后，调用构造xml的java方法：
try {

DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

// root elements
Document doc = docBuilder.newDocument();
Element rootElement = doc.createElement("company");
doc.appendChild(rootElement);

// staff elements
Element staff = doc.createElement("Staff");
rootElement.appendChild(staff);

// set attribute to staff element
Attr attr = doc.createAttribute("id");
attr.setValue("1");
staff.setAttributeNode(attr);

// shorten way
// staff.setAttribute("id", "1");

// firstname elements
Element firstname = doc.createElement("firstname");
firstname.appendChild(doc.createTextNode("yong"));
staff.appendChild(firstname);

// lastname elements
Element lastname = doc.createElement("lastname");
lastname.appendChild(doc.createTextNode("mook kim"));
staff.appendChild(lastname);

// nickname elements
Element nickname = doc.createElement("nickname");
nickname.appendChild(doc.createTextNode("mkyong"));
staff.appendChild(nickname);

// salary elements
Element salary = doc.createElement("salary");
salary.appendChild(doc.createTextNode("100000"));
staff.appendChild(salary);

// write the content into xml file
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(doc);
StreamResult result = new StreamResult(new File("d:\\person.xml"))；
transformer.transform(source, result);
System.out.println("File saved!");
} catch (ParserConfigurationException pce) {
pce.printStackTrace();
} catch (TransformerException tfe) {
tfe.printStackTrace();
}

3、构造完成：
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<company>
<staff id="1">
<firstname>yong</firstname>
<lastname>mook kim</lastname>
<nickname>mkyong</nickname>
<salary>100000</salary>
</staff>
</company>

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