jQuery+jsp实现省市县三级联动效果(附源码)

网络编程 2025/1/17 佚名

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本文实例讲述了jQuery+jsp实现省市县三级联动效果的方法。分享给大家供大家参考，具体如下：

在这里，用MySQL数据库存储了全国所有的省市县地区信息(点击此处下载源代码)

使用过的jar包

google的Gson.jar
mysql-connector-java-5.1.13-bin.jar

将实验图贴出来：

显示页面index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
 <base href="<%=basePath%>"> 
 <title>省市区三级联动下拉菜单</title>
 <script type="text/javascript" src="/UploadFiles/2021-04-02/jquery-1.7.min.js">

数据库交互GetDropdownDataServlet


public class GetDropdownDataServlet extends HttpServlet {
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws IOException, ServletException {
  doPost(request, response);
 }
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws IOException, ServletException {
  String parentId = request.getParameter("parentId");
  if (parentId == null || parentId == "") {
   parentId = "0";
  }
  Connection conn = null;
  String json = "";
  try {
   Class.forName("com.mysql.jdbc.Driver");
   conn = DriverManager.getConnection("jdbc:mysql://localhost/dropdown",
     "root", "root");
   Statement stat = conn.createStatement();
   ResultSet rs = stat
     .executeQuery("select region_id,region_name from region where parent_id = "
       + parentId);
   ArrayList rsList = new ArrayList();
   Map map = null;
   while (rs.next()) {
    map = new HashMap();
    map.put("id", rs.getInt(1));
    map.put("name", rs.getString(2));
    rsList.add(map);
   }
   rs = null;
   Gson gson = new Gson();
   json = gson.toJson(rsList);
   System.out.println("json=" + json);
  } catch (ClassNotFoundException e) {
   e.printStackTrace();
  } catch (SQLException e) {
   e.printStackTrace();
  } finally {
   if (conn != null) {
    try {
     conn.close();
    } catch (SQLException e) {
     e.printStackTrace();
    }
   }
  }
  response.setCharacterEncoding("UTF-8");
  response.getWriter().print(json);
 }
}




希望本文所述对大家jQuery程序设计有所帮助。

jQuery,jsp,省市县,三级联动,jQuery省市县三级联动

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