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本篇內容主要講解“ajax實現三級聯動省市的代碼”，感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷，實用性強。下面就讓小編來帶大家學習“ajax實現三級聯動省市的代碼”吧!
創建數據庫
首先創建 City 和 Province 類 給getter setter tostring 以及 構造方法 Province類
City類
連接數據庫
創建 接口 ProvinceInfoDao
實例化對象ProvinceInfoDaoImpl
以及CityInfoDao接口
CityInfoDaoImpl實例化對象
FindProvinceServlet
FindCityPidServlet
最后是jsp頁面
總結
我只寫到了市剩下的區可以復制粘貼的很簡單
所需要的jar包有
代碼如下
CREATE database provinces CHARACTER set utf8; use provices; CREATE table province ( pid INT PRIMARY KEY auto_increment, pname varchar(20) ); INSERT into province VALUES (null,"河南省"); INSERT into province VALUES (null,"海南省"); INSERT into province VALUES (null,"臺灣省"); INSERT into province VALUES (null,"山東省"); INSERT into province VALUES (null,"河北省"); CREATE table city ( cid INT PRIMARY KEY auto_increment, cname varchar(20), pid int ); INSERT into city VALUES(null,"漯河市",1); INSERT into city VALUES(null,"菏澤曹縣",4); INSERT into city VALUES(null,"高雄市",3); INSERT into city VALUES(null,"保定",5); INSERT into city VALUES(null,"三亞市",2);
package cn.hp.model;
public class Province {
private int pid;
private String pname;
public int getPid() {
return pid;
}
public void setPid(int pid) {
this.pid = pid;
}
public String getPname() {
return pname;
}
public void setPname(String pname) {
this.pname = pname;
}
@Override
public String toString() {
return "Province{" +
"pid=" + pid +
", pname='" + pname + '\'' +
'}';
}
public Province(int pid, String pname) {
this.pid = pid;
this.pname = pname;
}
public Province() {
}
}package cn.hp.model;
public class City {
private int cid;
private String cname;
private int pid;
public City() {
}
public int getCid() {
return cid;
}
@Override
public String toString() {
return "City{" +
"cid=" + cid +
", cname='" + cname + '\'' +
", pid=" + pid +
'}';
}
public void setCid(int cid) {
this.cid = cid;
}
public String getCname() {
return cname;
}
public City(String cname, int pid) {
this.cname = cname;
this.pid = pid;
}
public void setCname(String cname) {
this.cname = cname;
}
public int getPid() {
return pid;
}
public void setPid(int pid) {
this.pid = pid;
}
public City(int cid, String cname, int pid) {
this.cid = cid;
this.cname = cname;
this.pid = pid;
}
}package cn.hp.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class ConnDemo {
private static String Driver ="com.mysql.jdbc.Driver";
private static String Url = "jdbc:mysql://localhost:3306/provinces?characterEncoding=utf8";
private static String user ="root";
private static String pwd ="123456";
public static Connection conn;
public static Connection getConn() {
try {
Class.forName(Driver);
conn = DriverManager.getConnection(Url, user, pwd);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
public static void getClose() {
try {
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
// ?????????????
public static void main(String[] args) {
System.out.println(getConn());
if (getConn()!=null) {
System.out.println("??????");
}
}
}package cn.hp.dao;
import cn.hp.model.Province;
import java.util.List;
public interface ProvinceInfoDao {
public List<Province> findAll();
}package cn.hp.dao;
import cn.hp.model.Province;
import cn.hp.util.ConnDemo;
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 ProvinceInfoDaoImpl implements ProvinceInfoDao {
@Override
public List<Province> findAll() {
Connection conn= ConnDemo.getConn();
List<Province> list= new ArrayList<Province>();
String sql="select * from provice";
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));
list.add(p);
}
} catch (SQLException e) {
e.printStackTrace();
}
return list;
}
}package cn.hp.dao;
import cn.hp.model.City;
import java.util.List;
public interface CityInfoDao {
public List<City>findAllCity(int pid);
}package cn.hp.dao;
import cn.hp.model.City;
import cn.hp.model.Province;
import cn.hp.util.ConnDemo;
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 CityInfoDaoImpl implements CityInfoDao {
@Override
public List<City> findAllCity(int pid) {
Connection conn= ConnDemo.getConn();
List<City> list= new ArrayList<City>();
String sql="select * from city where pid =?";
try {
PreparedStatement ps= conn.prepareStatement(sql);
ps.setInt(1,pid);
ResultSet rs= ps.executeQuery();
while (rs.next()){
City c= new City();
c.setCid(rs.getInt(1));
c.setCname(rs.getString(2));
c.setPid(rs.getInt(3));
list.add(c);
}
} catch (SQLException e) {
e.printStackTrace();
}
return list;
}
}寫servlet FindProvinceServlet 以及FindCityPidServlet
package cn.hp.servlet;
import cn.hp.dao.ProvinceInfoDao;
import cn.hp.dao.ProvinceInfoDaoImpl;
import cn.hp.model.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("/findProvince")
public class FindProvinceServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
ProvinceInfoDao pid=new ProvinceInfoDaoImpl();
List<Province> plist =pid.findAll();
response.getWriter().write(JSONObject.toJSONString(plist));
}
}package cn.hp.servlet;
import cn.hp.dao.CityInfoDao;
import cn.hp.dao.CityInfoDaoImpl;
import cn.hp.model.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 FindCityByPidServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String id = request.getParameter("id");
CityInfoDao cid= new CityInfoDaoImpl();
List<City> clist = cid.findAllCity(Integer.parseInt(id));
response.getWriter().write(JSONObject.toJSONString(clist));
}
}<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<script src="js/jquery-3.6.0.js"></script>
<title>$Title$</title>
<script>
$(function () {
$.ajax({
type:"get",
url:"findProvince",
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+"</option>"
var ob= "<option value='"+data[i].pid+"'>"+data[i].pname+"</option>"
obj.append(ob)
}
}
})
})
</script>
</head>
<body>
<select name="province" id="province">
<option value="0">請選擇</option>
</select>省
<select name="city" id="city">
<option value="0">請選擇</option>
</select>市
<select name="street" id="street">
<option value="0">請選擇</option>
</select>區
</body>
<script>
$("#province").change(function () {
$("#city option").remove();
$.ajax({
type:"get",
url:"findCityByPid?id="+$("#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+"</option>"
obj.append(ob)
}
}
})
});
</script>
</html>到此，相信大家對“ajax實現三級聯動省市的代碼”有了更深的了解，不妨來實際操作一番吧！這里是億速云網站，更多相關內容可以進入相關頻道進行查詢，關注我們，繼續學習！
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