js使用xml数据载体实现城市省份二级联动效果

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> 
<% 
String path = request.getContextPath(); 
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 
%> 
 
 
 
  
  
  
  
  
   
  
  
  
  
 
  
   
  选择省份 
  湖南 
  广东 
   
    
   
   选择城市 
   
  
  
 
  
 

public class ProvinceServlet extends HttpServlet { 
 @Override 
 protected void doGet(HttpServletRequest req, HttpServletResponse resp) 
   throws ServletException, IOException { 
  req.setCharacterEncoding("utf-8"); 
  resp.setCharacterEncoding("utf-8"); 
  String province = req.getParameter("province"); 
  //重新编码 
  province = new String(province.getBytes("ISO-8859-1"),"utf-8"); 
  //设置格式为xml 
  resp.setContentType("text/xml;charset=utf-8"); 
  //获取字符输出流 
  PrintWriter pw = resp.getWriter(); 
  //拼接xml头 
  pw.write("<?xml version='1.0' encoding='UTF-8'?>"); 
  pw.write(""); 
  if ("湖南".equals(province)) { 
   pw.write("长沙"); 
   pw.write("株洲"); 
   pw.write("湘潭"); 
   pw.write("岳阳"); 
  }else if("广东".equals(province)){ 
   pw.write("广州"); 
   pw.write("深圳"); 
   pw.write("中山"); 
  } 
  pw.write(""); 
  pw.flush(); 
  pw.close(); 
 } 
}