相信很多小伙伴们对动态加载组合框也有一定的了解，本文通过实例代码给大家介绍了ajax实现动态加载组合框功能，感兴趣的朋友一起看看吧，希望能帮助到大家。
一 province.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>动态加载组合框
| 省份： | |
| 城市： |
二、CityByXMLServlet.java
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class CityByXMLServlet
*/
@WebServlet("/CityByXMLServlet")
public class CityByXMLServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final String CONTENT_TYPE = "text/xml; charset=UTF-8";
/**
* @see HttpServlet#HttpServlet()
*/
public CityByXMLServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType(CONTENT_TYPE); //设置服务器响应类型
String province =request.getParameter("province");
StringBuffer city = new StringBuffer(""); //记录返回XML串的对象
if("gx".equals(province)){
List list=cityInit(); //获取城市列表
for(int i=0;i"+list.get(i)+"");
}
}else if("hn".equals(province)){
List list = cityInit1(); //获取城市列表
for(int j=0;j"+list.get(j)+"");
}
}else if("hb".equals(province)){
List list = cityInit2(); //获取城市列表
for(int j=0;j"+list.get(j)+"");
}
}
city.append(" ");
PrintWriter out = response.getWriter();
out.println(city.toString());
out.flush(); //输出流刷新
out.close(); //关闭输出流
}
/*
* 初始化城市
*/
public List cityInit2() {
List cityList = new ArrayList();
//添加城市列表
cityList.add("武汉");
cityList.add("襄阳");
cityList.add("黄冈");
cityList.add("荆门");
cityList.add("十堰");
cityList.add("黄石");
return cityList;
}
public List cityInit(){
List cityList = new ArrayList();
//添加城市列表
cityList.add("南宁");
cityList.add("桂林");
cityList.add("北海");
cityList.add("河池");
cityList.add("梧州");
cityList.add("玉林");
return cityList;
}
public List cityInit1() {
List cityList = new ArrayList();
//添加城市列表
cityList.add("长沙");
cityList.add("湘潭");
cityList.add("岳阳");
cityList.add("常德");
cityList.add("衡阳");
cityList.add("邵阳");
return cityList;
}
/**
*当前Servelt的初始化方法.
*
* @throws ServletException发生ServletExceptio时抛出
*/
public void init() throws ServletException {
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
} 三 web.xml
CityByXMLServlet servlet.CityByXMLServlet CityByXMLServlet /CityByXMLServlet
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