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實現Ajax實現省市區三級級聯，需要Java解析json技術
整體Demo下載地址如下: 點我下載

address.html

!DOCTYPE html>
html>
head>
meta charset="UTF-8">
title>Insert title here/title>
/head>

 script type="text/javascript">

  /** 
   * 得到XMLHttpRequest對象 
   */
  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("您的瀏覽器不支持AJAX！");
      return false;
     }
    }
   }
   return xmlHttp;
  }
  /** 
   * 發送ajax請求 
   * url--請求到服務器的URL 
   * methodtype(post/get) 
   * con (true(異步)|false(同步)) 
   * functionName(回調方法名，不需要引號,這里只有成功的時候才調用) 
   * (注意：這方法有二個參數，一個就是xmlhttp,一個就是要處理的對象) 
   */
  function ajaxrequest(url, methodtype, con, functionName) {
   //獲取XMLHTTPRequest對象
   var xmlhttp = getajaxHttp();
   //設置回調函數（響應的時候調用的函數）
   xmlhttp.onreadystatechange = function() {
    //這個函數中的代碼在什么時候被XMLHTTPRequest對象調用？
    //當服務器響應時，XMLHTTPRequest對象會自動調用該回調方法
    if (xmlhttp.readyState == 4) {
     if (xmlhttp.status == 200) {
      functionName(xmlhttp.responseText);
     }
    }
   };
   //創建請求
   xmlhttp.open(methodtype, url, con);
   //發送請求
   xmlhttp.send();
  }

  window.onload=function(){
   ajaxrequest("addressSerlvet?method=provincial","POST",true,addrResponse);
  }
  //動態獲取省的信息
  function addrResponse(responseContents){
   var jsonObj = new Function("return" + responseContents)();
   for(var i = 0; i  jsonObj.addrList.length;i++){
    document.getElementById('select').innerHTML += 
     "option value='"+jsonObj.addrList[i].id+"'>"
      +jsonObj.addrList[i].address+
     "/option>"
   }
  }
  //選中省后
  function pChange(){
   //先將市的之前的信息清除
   document.getElementById('selectCity').innerHTML="option value='-1'>請選擇市/option>";
   //再將區的信息清除
   document.getElementById('selectArea').innerHTML="option value='-1'>請選擇區/option>";
   //再將用戶的輸入清楚
   document.getElementById("addr").innerHTML="";
   var val = document.getElementById('select').value;
   if(val == -1){
    document.getElementById('selectCity')[0].selected = true;
    return;
   }
   //開始執行獲取市
   ajaxrequest("addressSerlvet?method=cityprovincial="+val,"POST",true,cityResponse);
  }
  //獲取市的動態數據
  function cityResponse(responseContents){
   var jsonObj = new Function("return" + responseContents)();
   for(var i = 0; i  jsonObj.cityList.length;i++){
    document.getElementById('selectCity').innerHTML += 
     "option value='"+jsonObj.cityList[i].id+"'>"
      +jsonObj.cityList[i].address+
     "/option>"
   }
  }
  //選中市以后
  function cChange(){
   var val = document.getElementById('selectCity').value;
   //開始執行獲取區
   ajaxrequest("addressSerlvet?method=areacityId="+val,"POST",true,areaResponse);
  }
  //獲取區的動態數據
  function areaResponse(responseContents){
   var jsonObj = new Function("return" + responseContents)();
   for(var i = 0; i  jsonObj.areaList.length;i++){
    document.getElementById('selectArea').innerHTML += 
     "option value='"+jsonObj.areaList[i].id+"'>"
      +jsonObj.areaList[i].address+
     "/option>"
   }
  }
  //點擊提交按鈕
  function confirM(){
   //獲取省的文本值
   var p = document.getElementById("select");
   var pTex = p.options[p.options.selectedIndex].text;
   if(p.value=-1){
    alert("請選擇省");
    return;
   }
   //獲取市的文本值
   var city = document.getElementById("selectCity");
   var cityTex = city.options[city.options.selectedIndex].text;
   if(city.value=-1){
    alert("請選擇市");
    return;
   }
   //獲取區的文本值
   var area = document.getElementById("selectArea");
   var areaTex = area.options[area.options.selectedIndex].text;
   if(area.value=-1){
    alert("請選擇區");
    return;
   }
   //獲取具體位置id文本值
   var addr = document.getElementById("addr").value;
   //打印
   document.getElementById("show").innerHTML = "您選擇的地址為 " + pTex + " " + cityTex + " " + areaTex + " " + addr;
  }

 /script>
body>
 select id="select" onchange="pChange()">
  option value="-1">請選擇省/option>
 /select>
 select id="selectCity" onchange="cChange()">
  option value='-1'>請選擇市/option>
 /select>
 select id="selectArea" onchange="aChange()">
  option value='-1'>請選擇市/option>
 /select>
 input type="text" id="addr" />
 button onclick="confirM();">確定/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);
  }
 }
 /**
  * 根據市id獲取該市下的區的全部信息
  * @param request
  * @param response
  * @throws ServletException
  * @throws IOException
  */
 protected void getArea(HttpServletRequest request,
   HttpServletResponse response) throws ServletException, IOException {

  String cityId = request.getParameter("cityId");
  // 從數據庫中查詢省的信息
  ArrayListAddress> areaList = dao.getAreaByCityId(Integer.parseInt(cityId));
  // 將集合轉成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);
 }
 /**
  * 獲取省的信息 并相應
  * @param request
  * @param response
  * @throws ServletException
  * @throws IOException
  */
 protected void getProvincial(HttpServletRequest request,
   HttpServletResponse response) throws ServletException, IOException {

  // 從數據庫中查詢省的信息
  ArrayListAddress> addrList = dao.getProvince();
  // 將集合轉成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);
 }
 /**
  * 獲取市的信息并相應
  * @param request
  * @param response
  * @throws ServletException
  * @throws IOException
  */
 protected void getCity(HttpServletRequest request,
   HttpServletResponse response) throws ServletException, IOException {

  String provinceId = request.getParameter("provincial");
  // 從數據庫中查詢省的信息
  ArrayListAddress> addrList = dao.getCityByProvinceId(Integer.parseInt(provinceId));

  // 將集合轉成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 {
 /**
  * 獲取省的id和名稱
  * @return
  */
 ArrayListAddress> getProvince();
 /**
  * 根據省的id獲取市的信息
  * @param provinceId
  * @return
  */
 ArrayListAddress> getCityByProvinceId(int provinceId);
 /**
  * 根據市的id獲取區的信息
  * @param cityId
  * @return
  */
 ArrayListAddress> 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 ArrayListAddress> getProvince() {
  ArrayListAddress> addrList = new ArrayListAddress>();
  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 ArrayListAddress> getCityByProvinceId(int provinceId) {
  ArrayListAddress> addrList = new ArrayListAddress>();
  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 ArrayListAddress> getAreaByCityId(int cityId) {
  ArrayListAddress> addrList = new ArrayListAddress>();
  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;
 }

}

實體類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;
 }

}

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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Ajax實現省市區三級級聯(數據來自mysql數據庫)