三级联动 省市 ajax的代码

Posted 池鱼i_

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我只写到了市   剩下的区 可以复制粘贴  的     很简单   

所需要的jar包有

 

 

 代码如下   

创建数据库

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,"台湾省");
INSERT into province VALUES (null,"山东省");
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,"菏泽曹县",4);
INSERT into city VALUES(null,"高雄市",3);
INSERT into city VALUES(null,"保定",5);
INSERT into city VALUES(null,"三亚市",2);

首先创建    City   和 Province 类     给getter  setter   tostring  以及  构造方法

Province类

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() 
    

City类

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;
    

连接数据库

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();
		
	

	// �������ݿ�����
	public static void main(String[] args) 
		System.out.println(getConn());
		if (getConn()!=null) 
			System.out.println("���ӳɹ�");
		
	

创建 接口 ProvinceInfoDao

package cn.hp.dao;

import cn.hp.model.Province;

import java.util.List;

public interface ProvinceInfoDao 
    public  List<Province> findAll();

实例化对象ProvinceInfoDaoImpl

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;
    

以及CityInfoDao接口 

package cn.hp.dao;

import cn.hp.model.City;

import java.util.List;

public interface CityInfoDao 
    public  List<City>findAllCity(int pid);

 

CityInfoDaoImpl实例化对象

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;
    


 写servlet FindProvinceServlet  以及FindCityPidServlet 

FindProvinceServlet

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));
    

FindCityPidServlet  

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));


    

 

最后是jsp页面


<%@ 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">请选择</option>
   </select>省
   <select name="city" id="city">
     <option value="0">请选择</option>
   </select>市
   <select name="street" id="street">
     <option value="0">请选择</option>
   </select>区
  </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>

有什么不足的可以指出    谢谢支持    !

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