Ajax实现省市区三级级联(数据来自mysql数据库)
实现该技术需要Java解析json技术
整体Demo下载地址如下: 点我下载
address.html
<html>
<head>
<meta charset="UTF-8">
<title>Insert title heretitle>
head>
<script type="text/javascript"> /** * 得到XMLHttpRequest对象 */ function getajaxHttp() { var xmlHttp; try { // Firefox, Opera 8.0+, Safari xmlHttp = new XMLHttpRequest(); } catch (e) { // Internet Explorer try { xmlHttp = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { try { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) { alert("您的浏览器不支持AJAX！"); return false; } } } return xmlHttp; } /** * 发送ajax请求 * url--请求到服务器的URL * methodtype(post/get) * con (true(异步)|false(同步)) * functionName(回调方法名，不需要引号,这里只有成功的时候才调用) * (注意：这方法有二个参数，一个就是xmlhttp,一个就是要处理的对象) */ function ajaxrequest(url, methodtype, con, functionName) { //获取XMLHTTPRequest对象 var xmlhttp = getajaxHttp(); //设置回调函数（响应的时候调用的函数） xmlhttp.onreadystatechange = function() { //这个函数中的代码在什么时候被XMLHTTPRequest对象调用？ //当服务器响应时，XMLHTTPRequest对象会自动调用该回调方法 if (xmlhttp.readyState == 4) { if (xmlhttp.status == 200) { functionName(xmlhttp.responseText); } } }; //创建请求 xmlhttp.open(methodtype, url, con); //发送请求 xmlhttp.send(); } window.οnlοad=function(){ ajaxrequest("addressSerlvet?method=provincial","POST",true,addrResponse); } //动态获取省的信息 function addrResponse(responseContents){ var jsonObj = new Function("return" + responseContents)(); for(var i = 0; i < jsonObj.addrList.length;i++){ document.getElementById('select').innerHTML += " +jsonObj.addrList[i].address+ "" } } //选中省后 function pChange(){ //先将市的之前的信息清除 document.getElementById('selectCity').innerHTML=""; //再将区的信息清除 document.getElementById('selectArea').innerHTML=""; //再将用户的输入清楚 document.getElementById("addr").innerHTML=""; var val = document.getElementById('select').value; if(val == -1){ document.getElementById('selectCity')[0].selected = true; return; } //开始执行获取市 ajaxrequest("addressSerlvet?method=city&provincial="+val,"POST",true,cityResponse); } //获取市的动态数据 function cityResponse(responseContents){ var jsonObj = new Function("return" + responseContents)(); for(var i = 0; i < jsonObj.cityList.length;i++){ document.getElementById('selectCity').innerHTML += " +jsonObj.cityList[i].address+ "" } } //选中市以后 function cChange(){ var val = document.getElementById('selectCity').value; //开始执行获取区 ajaxrequest("addressSerlvet?method=area&cityId="+val,"POST",true,areaResponse); } //获取区的动态数据 function areaResponse(responseContents){ var jsonObj = new Function("return" + responseContents)(); for(var i = 0; i < jsonObj.areaList.length;i++){ document.getElementById('selectArea').innerHTML += " +jsonObj.areaList[i].address+ "" } } //点击提交按钮 function confirM(){ //获取省的文本值 var p = document.getElementById("select"); var pTex = p.options[p.options.selectedIndex].text; if(p.value=-1){ alert("请选择省"); return; } //获取市的文本值 var city = document.getElementById("selectCity"); var cityTex = city.options[city.options.selectedIndex].text; if(city.value=-1){ alert("请选择市"); return; } //获取区的文本值 var area = document.getElementById("selectArea"); var areaTex = area.options[area.options.selectedIndex].text; if(area.value=-1){ alert("请选择区"); return; } //获取具体位置id文本值 var addr = document.getElementById("addr").value; //打印 document.getElementById("show").innerHTML = "您选择的地址为 " + pTex + " " + cityTex + " " + areaTex + " " + addr; } script>
<body>
<select id="select" onchange="pChange()">
<option value="-1">请选择省option>
select>
<select id="selectCity" onchange="cChange()">
<option value='-1'>请选择市option>
select>
<select id="selectArea" onchange="aChange()">
<option value='-1'>请选择市option>
select>
<input type="text" id="addr" />
<button onclick="confirM();">确定button>
<div id="show">div>
body>
html>AddressServlet.java
package cn.bestchance.servlet;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.bestchance.dao.AddressDao;
import cn.bestchance.dao.impl.AddressDaoImpl;
import cn.bestchance.entity.Address;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
@WebServlet("/addressSerlvet")
public class AddressSerlvet extends HttpServlet {
private static final long serialVersionUID = 1L;
private AddressDao dao = new AddressDaoImpl();
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse * response) */
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
response.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String method=request.getParameter("method");
if("provincial".equals(method)){
getProvincial(request, response);
}
if("city".equals(method)){
getCity(request, response);
}
if("area".equals(method)){
getArea(request, response);
}
}
/** * 根据市id获取该市下的区的全部信息 * @param request * @param response * @throws ServletException * @throws IOException */
protected void getArea(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String cityId = request.getParameter("cityId");
// 从数据库中查询省的信息
ArrayList areaList = dao.getAreaByCityId(Integer.parseInt(cityId));
// 将集合转成json字符串
JSONObject jsonObj = new JSONObject();
JSONArray jsonArray = JSONArray.fromObject(areaList);
jsonObj.put("areaList", jsonArray);
String jsonDataStr = jsonObj.toString();
response.getWriter().print(jsonDataStr);
}
/** * 获取省的信息 并相应 * @param request * @param response * @throws ServletException * @throws IOException */
protected void getProvincial(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// 从数据库中查询省的信息
ArrayList addrList = dao.getProvince();
// 将集合转成json字符串
JSONObject jsonObj = new JSONObject();
JSONArray jsonArray = JSONArray.fromObject(addrList);
jsonObj.put("addrList", jsonArray);
String jsonDataStr = jsonObj.toString();
response.getWriter().print(jsonDataStr);
}
/** * 获取市的信息并相应 * @param request * @param response * @throws ServletException * @throws IOException */
protected void getCity(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
String provinceId = request.getParameter("provincial");
// 从数据库中查询省的信息
ArrayList addrList = dao.getCityByProvinceId(Integer.parseInt(provinceId));
// 将集合转成json字符串
JSONObject jsonObj = new JSONObject();
JSONArray jsonArray = JSONArray.fromObject(addrList);
jsonObj.put("cityList", jsonArray);
String jsonDataStr = jsonObj.toString();
response.getWriter().print(jsonDataStr);
}
}
AddressDao.java
package cn.bestchance.dao;
import java.util.ArrayList;
import cn.bestchance.entity.Address;
public interface AddressDao {
/** * 获取省的id和名称 * @return */
ArrayList getProvince();
/** * 根据省的id获取市的信息 * @param provinceId * @return */
ArrayList getCityByProvinceId(int provinceId);
/** * 根据市的id获取区的信息 * @param cityId * @return */
ArrayList getAreaByCityId(int cityId);
}
AddressDaoImpl.java
package cn.bestchance.dao.impl;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import cn.bestchance.dao.AddressDao;
import cn.bestchance.entity.Address;
import cn.bestchance.util.DBUtil;
public class AddressDaoImpl implements AddressDao {
private DBUtil db = new DBUtil();
@Override
public ArrayList getProvince() {
ArrayList addrList = new ArrayList();
db.openConnection();
String sql = "select * from province";
ResultSet rs = db.excuteQuery(sql);
try {
while(rs.next()){
Address addr = new Address();
addr.setId(rs.getInt(2));
addr.setAddress(rs.getString(3));
addrList.add(addr);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(rs != null){
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
db.closeResoure();
}
return addrList;
}
@Override
public ArrayList getCityByProvinceId(int provinceId) {
ArrayList addrList = new ArrayList();
db.openConnection();
String sql = "select * from city where fatherID = " + provinceId; //431200
ResultSet rs = db.excuteQuery(sql);
try {
while(rs.next()){
Address addr = new Address();
addr.setId(rs.getInt(2));
addr.setAddress(rs.getString(3));
addrList.add(addr);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(rs != null){
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
db.closeResoure();
}
return addrList;
}
@Override
public ArrayList getAreaByCityId(int cityId) {
ArrayList addrList = new ArrayList();
db.openConnection();
String sql = "select * from area where fatherID = " + cityId; //431200
ResultSet rs = db.excuteQuery(sql);
try {
while(rs.next()){
Address addr = new Address();
addr.setId(rs.getInt(2));
addr.setAddress(rs.getString(3));
addrList.add(addr);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
if(rs != null){
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
db.closeResoure();
}
return addrList;
}
}
实体类Address.java
package cn.bestchance.entity;
public class Address {
@Override
public String toString() {
return "Address [id=" + id + ", address=" + address + "]";
}
private int id;
private String address;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public Address() {
super();
// TODO Auto-generated constructor stub
}
public Address(int id, String address) {
super();
this.id = id;
this.address = address;
}
}