Ajax+servlet+web.xml Ajax select 下拉菜单 实例

--- servlet----

package com.ajax;

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 {

String[][] hebeiArr;
String[][] beijingArr;

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
    throws ServletException, IOException {
   System.out.println("ajaxServlet onload .....");
   hebeiArr = new String[3][2];
   beijingArr = new String[3][2];
   String[][] tmpArr = null;
   hebeiArr[0][0] = "11";
   hebeiArr[0][1] = "石家庄";
   hebeiArr[1][0] = "12";
   hebeiArr[1][1] = "廊坊";
   hebeiArr[2][0] = "13";
   hebeiArr[2][1] = "秦皇岛";
   beijingArr[0][0] = "01";
   beijingArr[0][1] = "昌平";
   beijingArr[1][0] = "02";
   beijingArr[1][1] = "通州";
   beijingArr[2][0] = "03";
   beijingArr[2][1] = "大兴";
   String id = req.getParameter("id");
   if(id.equals("hb")){
    tmpArr = hebeiArr;
   } else if(id.equals("bj")){
    tmpArr = beijingArr;
   }
   StringBuffer sb = new StringBuffer();
   sb.append("");
   System.out.println(tmpArr.length);
   for(int i=0; i    sb.append(""+tmpArr[i][0]+""+tmpArr[i][1]+"");
   }
   sb.append("");
   resp.setContentType("text/xml");
   resp.setHeader("Cache-Control", "no-cache");
   resp.setCharacterEncoding("utf-8");
   PrintWriter out = resp.getWriter();
   out.print(sb.toString());
   System.out.println(sb.toString());
   out.close();
}

@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
    throws ServletException, IOException {
   this.doGet(req, resp);
}

}
-----------------------

----- jsp-------

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%

%>

  
  

河北省      北京市

选择

---------------------

---------web.xml---------

xmlns=""
xmlns:xsi=""
xsi:schemaLocation="
">

    index.jsp


AjaxServlet
com.ajax.AjaxServlet



AjaxServlet
/servlet/AjaxServlet


----------------------