IT俱乐部 Ajax Ajax实现省市县三级联动

Ajax实现省市县三级联动

发布: 2023年 1月 31日 609阅读

本文实例为大家分享了Ajax实现省市县三级联动的具体代码，供大家参考，具体内容如下

首先建立数据库，如下所示

接口

省

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import java.util.List;
public interface ProvinceDao {
 List<province> findAll();
}</province>

市

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import java.util.List;
public interface CityDao {
 List<city> findCityByPid(int pid);
}</city>

县

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import java.util.List;
public interface AreaDao {
 List<area> findAreaByCid(int cid);
}

接口实现类

省

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import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
 
public class ProvinceDaoImpl implements ProvinceDao{
 public List<province> findAll(){
 Connection conn = DBHelper.getConn();
 ArrayList<province> provinces = new ArrayList<province>();
 String sql = "select * from aprovince";
 try {
 PreparedStatement ps = conn.prepareStatement(sql);
 ResultSet rs = ps.executeQuery();
 while (rs.next()){
 Province p = new Province();
 p.setPid(rs.getInt(1));
 p.setPname(rs.getString(2));
 provinces.add(p);
 }
 } catch (SQLException e) {
 e.printStackTrace();
 }
 return provinces;
 }
}</province></province></province>

市

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import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
 
public class CityDaoImpl implements CityDao {
 @Override
 public List<city> findCityByPid(int pid) {
 Connection conn = DBHelper.getConn();
 
 ArrayList<city> cities = new ArrayList();
 
 String sql = "select * from acity where pid=?";
 
 try {
 PreparedStatement ps = conn.prepareStatement(sql);
 ps.setInt(1,pid);
 ResultSet rs = ps.executeQuery();
 while (rs.next()){
 City city = new City();
 city.setPid(rs.getInt(3));
 city.setCid(rs.getInt(1));
 city.setCname(rs.getString(2));
 cities.add(city);
 }
 } catch (SQLException e) {
 e.printStackTrace();
 }
 return cities;
 }
}</city></city>

县

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import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
 
public class AreaDaoImpl implements AreaDao {
 @Override
 public List<area> findAreaByCid(int cid) {
 Connection conn = DBHelper.getConn();
 ArrayList<area> areas = new ArrayList();
 String sql = "select * from aarea where cid=?";
 
 try {
 PreparedStatement ps = conn.prepareStatement(sql);
 ps.setInt(1,cid);
 ResultSet rs = ps.executeQuery();
 while (rs.next()){
 Area area = new Area();
 area.setCid(rs.getInt(3));
 area.setAid(rs.getInt(1));
 area.setAname(rs.getString(2));
 areas.add(area);
 }
 } catch (SQLException e) {
 e.printStackTrace();
 }
 return areas;
 }
}

servlet

省

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package cn.zhc.servlet;
 
import cn.zhc.dao.Impl.ProvinceDaoImpl;
import cn.zhc.dao.ProvinceDao;
import cn.zhc.domin.Province;
import com.alibaba.fastjson.JSONObject;
 
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 java.io.IOException;
import java.util.List;
 
@WebServlet("/findAll")
public class FindAll extends HttpServlet {
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 request.setCharacterEncoding("utf-8");
 response.setContentType("text/html;charset=utf-8");
 
 ProvinceDao provinceDao = new ProvinceDaoImpl();
 List<province> lists=provinceDao.findAll();
 
 response.getWriter().write(JSONObject.toJSONString(lists));
 }
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 this.doPost(request, response);
 }
}</province>

市

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package cn.zhc.servlet;
 
import cn.zhc.dao.CityDao;
import cn.zhc.dao.Impl.CityDaoImpl;
import cn.zhc.domin.City;
import com.alibaba.fastjson.JSONObject;
 
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 java.io.IOException;
import java.util.List;
 
@WebServlet("/findCityByPid")
public class FindCityByPid extends HttpServlet {
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 request.setCharacterEncoding("utf-8");
 response.setContentType("text/html;charset=utf-8");
 
 String pid = request.getParameter("pid");
 
 CityDao cityDao = new CityDaoImpl();
 List<city> cityList = cityDao.findCityByPid(Integer.parseInt(pid));
 
 response.getWriter().write(JSONObject.toJSONString(cityList));
 }
 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 this.doPost(request, response);
 }
}</city>

县

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package cn.zhc.servlet;
 
import cn.zhc.dao.AreaDao;
import cn.zhc.dao.Impl.AreaDaoImpl;
import cn.zhc.domin.Area;
import com.alibaba.fastjson.JSONObject;
 
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 java.io.IOException;
import java.util.List;
 
@WebServlet("/findAreaByCid")
public class FindAreaByCid extends HttpServlet {
 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 request.setCharacterEncoding("utf-8");
 response.setContentType("text/html;charset=utf-8");
 
 String cid = request.getParameter("cid");
 
 AreaDao areaDao = new AreaDaoImpl();
 List<area> areas = areaDao.findAreaByCid(Integer.parseInt(cid));
 
 response.getWriter().write(JSONObject.toJSONString(areas));
 }
 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 this.doPost(request, response);
 }
}

JSP页面

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<title>三级联动</title><script type="text/javascript" src="js/jquery-1.8.3.js"></script><script type="text/javascript">
 $(function () {
 $.ajax({
 type:"get",
 url:"findAll",
 dataType:"json",
 success:function (data) {
 var obj=$("#province");
 for(var i=0;i<data.length;i++){
 var ob="<option value='"+data[i].pid+"'>"+data[i].pname+"";
 obj.append(ob);
 }
 }
 })
 
 $("#province").change(function () {
 $("#city option").remove();
 $.ajax({
 type:"get",
 async:false,
 url:"findCityByPid?pid="+$("#province").val(),
 dataType:"json",
 success:function (data) {
 var obj=$("#city");
 for(var i=0;i<data.length;i++){
 var ob="<option value='"+data[i].cid+"'>"+data[i].cname+"";
 obj.append(ob);
 }
 }
 })
 });
 
 $("#city,#province").change(function () {
 $("#area option").remove();
 $.ajax({
 type:"get",
 async:false,
 url:"findAreaByCid?cid="+$("#city").val(),
 dataType:"json",
 success:function (data) {
 var obj=$("#area");
 for(var i=0;i<data.length;i++){
 var ob="<option value='"+data[i].aid+"'>"+data[i].aname+"";
 obj.append(ob);
 }
 }
 })
 });
 });
</script><select name="province" id="province"><option value="0">请选择</option></select>省
<select name="city" id="city"><option value="0">请选择</option></select>市
<select name="area" id="area"><option value="0">请选择</option></select>县

实现结果如下：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持IT俱乐部。

本文收集自网络，不代表IT俱乐部立场，转载请注明出处。https://www.2it.club/navsub/ajax/1827.html
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