ajax实现省市三级联动效果 ajax实现省市三级联动效果

时间:2021-03-30 人气:0

1、html代码

<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title>Title</title>
 <style type="text/css">
  .wrap
  {
   background-color: beige;
   width: 400px;
   height: 200px;
   margin: 0 auto;
   text-align: center;
   margin-top: 200px;
  }
  .wrap select
  {
   width:130px;
   height: 30px;
  }
 </style>
 <script type="text/javascript" src="jquery-1.8.3.min.js"></script>
</head>
<body>
<div class="wrap">
 <select id="province">
 </select>
 <select id="city">
 </select>
</div>
<script type="text/javascript">
 function getctiydata() {
  $("#city").empty();
  var pid = $("#province").val();
  $.ajax({
   url:"/getCitys?pid="+pid,
   dataType:"json"
  }).done(function (data) {
   for (var i in data)
   {
    $("#city").append($("<option value='"+ data[i].id +"'>"
     + data[i].name +"</option>"))
   }
  })
  
 }
 $.ajax({
  url: "/getAllProvince",
  dataType:"json"
 }).done(function (data) {
  for (var i in data)
  {
   $("#province").append($("<option value = '"+data[i].id+"'>"
    + data[i].name +"</option>"))
  }
  getctiydata()
 });

 $("#province").change(function () {
  getctiydata()
 })
</script>
</body>
</html>

2、javaservlet

package servlet;

import DButil.DataSourceUtil;
import com.alibaba.fastjson.JSON;
import domain.Province;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import javax.jws.WebService;
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.sql.SQLException;
import java.util.List;

@WebServlet("/getAllProvince")
public class ProvinceServlet extends HttpServlet
{
 @Override
 protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
 {
  resp.setContentType("application/json;charset=utf8");
  QueryRunner queryRunner = new QueryRunner(DataSourceUtil.getDataSource());
  String sql = "select * from province";
  try
  {
   List<Province> provinces = queryRunner.query(sql, new BeanListHandler<Province>(Province.class));
   Object json = JSON.toJSON(provinces);
   resp.getWriter().print(json);

  } catch (SQLException e)
  {
   e.printStackTrace();
  }

 }
}

package servlet;

import DButil.DataSourceUtil;
import com.alibaba.fastjson.JSON;
import domain.City;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import javax.jws.WebService;
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.sql.SQLException;
import java.util.List;

@WebServlet("/getCitys")
public class CityServlet extends HttpServlet
{
 @Override
 protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
 {
  resp.setContentType("application/json;charset=utf8");
  QueryRunner queryRunner = new QueryRunner(DataSourceUtil.getDataSource());
  String pid = req.getParameter("pid");
  String sql = "select * from City where pid=?";
  try
  {
   List<City> cities = queryRunner.query(sql, new BeanListHandler<City>(City.class), pid);
   Object toJSON = JSON.toJSON(cities);
   resp.getWriter().print(toJSON);
  } catch (SQLException e)
  {
   e.printStackTrace();
  }
 }
}

3、数据库池化

<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config>
 <default-config>
  <property name="driverClass">com.mysql.jdbc.Driver</property>
  <property name="jdbcUrl">jdbc:mysql://localhost:3306/text</property>
  <property name="user">root</property>
  <property name="password">root</property>
  <property name="acquireRetryAttempts">0</property>
 </default-config>
</c3p0-config>

以上就是省市联动的核心代码。

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