AJAX返回xml代码如何在网页中显示

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========web.xml=================

<servlet-name>ajaxServlet</servlet-name>
<servlet-class>web.AjaxServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ajaxServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>

===========index.jsp===============

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<script type="text/javascript">
function getResult() {
var xhr;
var url = "ajaxServlet.do";
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
} else if (window.ActiveXObject) {
xhr = new ActiveXOjbect("Microsoft.XMLHTTP");
}
if (xhr) {
xhr.open("GET", url, true);
xhr.onreadystatechange = complete;
alert(xhr);
xhr.send(null);
}
function complete() {
if (xhr.readyState == 4) {
if (xhr.status == 200) {
//var type=xhr.resoinseXML.getElementById("");
var res = xhr.responseXML;
alert(res);
}
}
}
}
</script>
</head>

<body onload="getResult()">

</body>
</html>

===========AjaxServlet.java=================

package web;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AjaxServlet extends HttpServlet{
@Override
protected void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/xml;charset=utf8");
PrintWriter out=response.getWriter();
String url=request.getRequestURI();
String name=request.getParameter("username");
String path=url.substring(url.lastIndexOf("/"),url.lastIndexOf("."));
System.out.println("path:"+path);
if("/ajaxServlet".equals(path)){
StringBuffer sb=new StringBuffer("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
sb.append("<type>");
sb.append("<type_name>"+name+"</type_name>");
sb.append("<type_name>BB</type_name>");
sb.append("<type_name>CC</type_name>");
sb.append("<type_name>DD</type_name>");
sb.append("</type>");
out.write(sb.toString());
out.close();
}
}
}

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