java对象转换成xml

import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.Dom4JDriver;

public class Test {
	/**
	 * 目标对象
	 * @author Lihc
	 *
	 */
	class UserTest {
		private String name;
		private int age;
		public String getName() {
			return name;
		}
		public void setName(String name) {
			this.name = name;
		}
		public int getAge() {
			return age;
		}
		public void setAge(int age) {
			this.age = age;
		}
		
	}
	public static void main(String[] args)throws Exception{
		/*
		 * 准备测试数据
		 */
		List u = new ArrayList();
		 for(int i = 0; i<2;i++){
			 UserTest r = new UserTest();
			 r.setName("测试");
			 r.setAge(100);
			 u.add(r);
		 }
		
		/*
		 * 测试过程
		 */
	    XStream xstream = new XStream(new Dom4JDriver());    
	    xstream.alias("user", UserTest.class);    
	    Document document = DocumentHelper.createDocument(DocumentHelper.createElement("yycs"));    
	    Document document1 = DocumentHelper.parseText(xstream.toXML(u));    
	    Document document2 = DocumentHelper.parseText(xstream.toXML(u));    
	    Element user1 = (Element)document1.selectSingleNode("//list");    
	    //Element user2 = (Element)document2.selectSingleNode("//list");    
	    document.getRootElement().appendContent(user1);    
	    // document.getRootElement().appendContent(user2);    
	    System.out.println(document.asXML()); 
	}

}