创建XML

<?xml version="1.0" encoding="UTF-8"?>
<user>
  <email>[e-mail]</email>
  <password>test</password>
  <firstname>x</firstname>
  <lastname>u</lastname>
</user>

	
//roottag是根tag:user;tags是根tag里面包含的所有子tag:email,password,firstname,lastname;texts是对应于每个子tag的值
public static StringWriter buildXML(String roottag, String[] tags,
			String[] texts) throws IllegalArgumentException,
			IllegalStateException, IOException {
		XmlSerializer serializer = Xml.newSerializer();
		StringWriter writer = new StringWriter();
		serializer.setOutput(writer);
		serializer.startDocument(encoding, true);
		serializer.startTag(null, roottag);
		for (int i = 0; i < tags.length; i++) {
			serializer.startTag(null, tags[i]);
			serializer.text(texts[i]);
			serializer.endTag(null, tags[i]);
		}
		serializer.endTag(null, roottag);
		serializer.endDocument();
		System.out.println("user.xml is" + writer.toString());
		return writer;
	}