使用ajax怎么实现一个省市三级联动效果-创新互联
使用ajax怎么实现一个省市三级联动效果?很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
创新互联建站专注于措勤企业网站建设,响应式网站建设,商城网站建设。措勤网站建设公司,为措勤等地区提供建站服务。全流程定制网站开发,专业设计,全程项目跟踪,创新互联建站专业和态度为您提供的服务什么是ajax
ajax是一种在无需重新加载整个网页的情况下,能够更新部分网页的技术,可以通过在后台与服务器进行少量数据交换,使网页实现异步更新。
1、html代码
Title
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 { Listprovinces = queryRunner.query(sql, new BeanListHandler (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 { Listcities = queryRunner.query(sql, new BeanListHandler (City.class), pid); Object toJSON = JSON.toJSON(cities); resp.getWriter().print(toJSON); } catch (SQLException e) { e.printStackTrace(); } } }
3、数据库池化
com.mysql.jdbc.Driver jdbc:mysql://localhost:3306/text root root 0
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