package com.hanqi.web;

import java.io.IOException;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.alibaba.fastjson.JSONArray;

import com.hanqi.entity.Region;

import com.hanqi.service.RegionService;

/**

 * Servlet implementation class RegionServlet

 */

public class RegionServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public RegionServlet() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        request.setCharacterEncoding("UTF-8");

        response.setCharacterEncoding("UTF-8");

        response.setContentType("text/html");

        // 接受参数

        String parentid =request.getParameter("parentid");

        if(parentid!=null)

        {

        //地区地区列表

        List<Region> lr=new RegionService().getList(parentid);

        //返回JSON格式的数据

        String json=JSONArray.toJSONString(lr);

        response.getWriter().print(json);

        }

        else

        {

            response.getWriter().print("[]");

        }

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

        doGet(request, response);

    }

}

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<!-- 1、JQuery的js包 -->
<script type="text/javascript" src="jquery-easyui-1.4.4/jquery.min.js"></script>
<!-- 2 css资源 -->
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.4/themes/default/easyui.css">
<!-- 3、图标资源 -->
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.4/themes/icon.css">
<!-- 4、easyui的js包 -->
<script type="text/javascript" src="jquery-easyui-1.4.4/jquery.easyui.min.js"></script>

<!-- 5、本地语言 -->
<script type="text/javascript" src="jquery-easyui-1.4.4/locale/easyui-lang-zh_CN.js"></script>

</head>
<body>
修改员工的页面

<input id="cc1" class="easyui-combobox" data-options="
valueField: 'id',
textField: 'text',
url:'json/combo.json',
onSelect: function(rec){
var url = 'json/combo1.json?id='+rec.id;
$('#cc2').combobox('reload', url);
}"/>
<input id="cc2" class="easyui-combobox" data-options="valueField:'id',textField:'text'" />
<br><br>
省：
<input id="sheng" class="easyui-combobox" style="width:100px"
data-options="{
url:'RegionServlet?parentid=0',
valueField:'regionID',
textField:'regionName',
onSelect:function(region){
//alert('选择了省id='+region.regionID);
//清除原有项目
$('#shi').combobox('clear');
$('#quxian').combobox('clear');
//重新加载
$('#shi').combobox('reload','RegionServlet?parentid='+region.regionID);
$('#quxian').combobox('reload','RegionServlet');
}
}">
市：
<input id="shi" class="easyui-combobox" style="width:100px"
data-options="{
url:'RegionServlet',
valueField:'regionID',
textField:'regionName',
onSelect:function(region){
$('#quxian').combobox('clear');
//重新加载
$('#quxian').combobox('reload','RegionServlet?parentid='+region.regionID);

}
}">

区/县：
<input id="quxian" class="easyui-combobox" style="width:100px"
data-options="{
url:'RegionServlet',
valueField:'regionID',
textField:'regionName'
}">
</body>
</html>