ajax实现省市三级联动效果

(编辑：jimmy 日期: 2024/10/10 浏览：3 次 )

本文实例为大家分享了ajax实现三级联动效果的具体代码，供大家参考，具体内容如下

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="/UploadFiles/2021-04-02/jquery-1.8.3.min.js">

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


<"1.0" encoding="UTF-8""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。


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。

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