Ajax地域选择demo

2023-07-21 19:19:46

index.jsp只用于转发到Servlet获得省份数据再转发到province.jsp

index.jsp

<%@ page language="java" contentType="text/html; UTF-8"

    pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<base href="${pageContext.request.scheme }://${pageContext.request.serverName }:${pageContext.request.serverPort }${pageContext.request.contextPath}/">

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<jsp:forward page="chinaServlet" >

   <jsp:param name="method" value="getProvinces"></jsp:param>

</jsp:forward>

</body>

</html>

province.jsp

<%@ page language="java" contentType="text/html; UTF-8"

    pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<base href="${pageContext.request.scheme }://${pageContext.request.serverName }:${pageContext.request.serverPort }${pageContext.request.contextPath}/">

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<script type="text/javascript" src="script/jquery-1.7.2.min.js"></script>

<title>Insert title here</title>

<%response.setCharacterEncoding("UTF-8"); %>

<script type="text/javascript">

   $(function() {

    $("#province").change(function() {

        $("#city option:not(:first)").remove();

        var url = "chinaServlet";

        var provinceId = $(this).val();

        //alert(provinceId);

        if(provinceId!=""){

        var json = {"method":"getCitys","provinceId":provinceId};

        $.post(url,json, function(data) {

            //alert(data[1].name);

            for(var i = 0;i<data.length;i++){

                $("#city").append("<option value="+data[i].cityId+">"+data[i].name+"</option>")

            }

        },"json")

      }

    });

})

</script>

</head>

<body>

  <select id="province">

    <option value="">请选择...</option>

    <c:forEach items="${requestScope.provinces }" var="provinces">

       <option value="${provinces.provinceId}">${provinces.name}</option>

    </c:forEach>

   </select>

   <select id="city">

    <option value="">请选择...</option>

   </select>

</body>

</html>

Servlet

package com.servlet;

import java.io.IOException;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.List;

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 com.dao.CityDao;

import com.dao.ProvinceDao;

import com.dao.impl.CityDaoImpl;

import com.dao.impl.ProvinceDaoImpl;

import com.domain.City;

import com.domain.Province;

import com.google.gson.Gson;

import com.sun.media.jfxmedia.events.NewFrameEvent;

/**

 * Servlet implementation class ChinaServlet

 */

@WebServlet("/chinaServlet")

public class ChinaServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public ChinaServlet() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

             doPost(request, response);

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        String methodName = request.getParameter("method");

        System.out.println(methodName);

        try {

            Method method = getClass().getDeclaredMethod(methodName, HttpServletRequest.class,HttpServletResponse.class);

            method.invoke(this, request,response);//反射获得方法

        } catch (NoSuchMethodException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (SecurityException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (IllegalAccessException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (IllegalArgumentException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (InvocationTargetException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

    public void getProvinces(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //得到省份数据

        ProvinceDao dao = new ProvinceDaoImpl();

        List<Province> provinces = dao.queryForList();

        System.out.println(provinces);

        request.setAttribute("provinces", provinces);

        request.getRequestDispatcher("/WEB-INF/pages/province.jsp").forward(request, response);

    }

    public void getCitys(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //等到城市数据

        String provinceId = request.getParameter("provinceId");

        System.out.println(provinceId);

        CityDao dao = new CityDaoImpl();

        List<City> cities = dao.queryByProvinceId(provinceId);

        //System.out.println(cities);

        Gson gson = new Gson();

        String json = gson.toJson(cities);

        //System.out.println(json);

        response.setCharacterEncoding("UTF-8");

        response.setContentType("text/javascript");

        response.getWriter().print(json);

    }   

}

Dao类方法不在这里贴了

 源码下载 http://files.cnblogs.com/files/lusufei/AJAX%E5%9C%B0%E5%9F%9F%E9%80%89%E6%8B%A9demo.zip

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