* XMLHttpRequest对象的responseXML属性：XML格式
* 服务器端：
* 设置响应首部信息，"Content-Type"为"text/xml"
* 手工构建一个xml格式的数据内容
* 如何将javabean、List、Array和Map集合转换成xml数据格式？
* 第三方工具：xStream
* 核心包：xstream-1.4.4.jar
* 必要依赖包：xpp3_min-1.1.4c.jar
* 客户端：XMLHttpRequest对象的responseXML属性
XmlFileServlet.java
public class XmlFileServlet extends HttpServlet {
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws servletexception,IOException {
//如果服务器端向客户端响应xml格式的数据，需要设置响应首部信息："Content-Type"为"text/xml"
response.setContentType("text/xml;charset=utf-8");
PrintWriter out = response.getWriter();
//查询数据库，结果集都封装在javabean、List、Array和Map集合中
//如何将javabean、List、Array和Map集合转换成xml数据格式？
//手工构建一个xml格式的数据内容
out.println("<china>");
out.println("<province name='吉林省'>");
out.println("<city>长春</city>");
out.println("<city>吉林市</city>");
out.println("<city>四平</city>");
out.println("<city>松原</city>");
out.println("<city>通化</city>");
out.println("</province>");
out.println("<province name='辽宁省'>");
out.println("<city>沈阳</city>");
out.println("<city>大连</city>");
out.println("<city>鞍山</city>");
out.println("<city>抚顺</city>");
out.println("<city>铁岭</city>");
out.println("</province>");
out.println("<province name='山东省'>");
out.println("<city>济南</city>");
out.println("<city>青岛</city>");
out.println("<city>威海</city>");
out.println("<city>烟台</city>");
out.println("<city>潍坊</city>");
out.println("</province>");
out.println("</china>");
}
}
<%@ page language="java" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>级联菜单</title>
<script type="text/javascript" src="./xmFile.js"> </script>
</head>
<body>
<select id="province" name="province">
<option value="">请选择....</option>
</select>
<select id="city" name="city">
<option value="">请选择.....</option>
</select>
</body>
</html>
window.onload = function(){
var xhr = ajaxFunction();
xhr.onreadystatechange = function(){
if(xhr.readyState==4){
if(xhr.status==200){
var docXml = xhr.responseXML;
var provinceXmlElements = docXml.getElementsByTagName("province");
for(var i=0;i<provinceXmlElements.length;i++){
var provinceXmlElement = provinceXmlElements[i];
var provinceXmlValue = provinceXmlElement.getAttribute("name");
var option = document.createElement("option");
option.setAttribute("value",provinceXmlValue);
var text = document.createTextNode(provinceXmlValue);
option.appendChild(text);
var provinceElement = document.getElementById("province");
provinceElement.appendChild(option);
}
document.getElementById("province").onchange = function(){
var cityElement = document.getElementById("city");
var options = cityElement.getElementsByTagName("option");
for(var z=1;z<options.length;z++){
cityElement.removeChild(options[1]);
z--;
}
var provinceValue = this.value;
for(var i=0;i<provinceXmlElements.length;i++){
var provinceXmlElement = provinceXmlElements[i];
var provinceXmlValue = provinceXmlElement.getAttribute("name");
if(provinceValue==provinceXmlValue){
var cityXmlElements = provinceXmlElement.getElementsByTagName("city");
for(var j=0;j<cityXmlElements.length;j++){
var cityXmlElement = cityXmlElements[j];
var cityXmlValue = cityXmlElement.firstChild.nodeValue;
var option = document.createElement("option");
option.setAttribute("value",cityXmlValue);
var text = document.createTextNode(cityXmlValue);
option.appendChild(text);
cityElement.appendChild(option);
}
}
}
}
}
}
}
xhr.open("get","../xmlFileServlet?timeStamp="+new Date().getTime(),true);
xhr.send(null);
function ajaxFunction(){
var xmlHttp;
try{ // Firefox,Opera 8.0+,Safari
xmlHttp=new XMLHttpRequest();
}
catch (e){
try{// Internet Explorer
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e){
try{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e){}
}
}
return xmlHttp;
}
}