如何输出xml到页面，只用servlet不用jsp

package com.excel.tools;



import java.io.IOException;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



public class XmlServlet extends HttpServlet {



	@Override

	protected void doGet(HttpServletRequest req, HttpServletResponse resp)

			throws ServletException, IOException {

		

		resp.setContentType("text/xml");

		resp.getWriter().append("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n").append("<results>\n")

        .append("<ret>").append("1111").append("</ret>\n")//

        .append("<ret_msg>").append("2222").append("</ret_msg>\n")//

        .append("</results>");

		resp.getWriter().flush();

		resp.getWriter().close();

		

	}



	@Override

	protected void doPost(HttpServletRequest req, HttpServletResponse resp)

			throws ServletException, IOException {

		// TODO Auto-generated method stub

		doGet(req, resp);

	}



}