虚拟数据库_json_ajax

html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

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

<title>ajax json jquery 菜单案例</title>

<style type="text/css">

* {

    margin: 0;

    padding: 0;

}

body {

    font-size: 13px;

    line-height: 130%;

    padding: 60px

}

</style>

<link rel="stylesheet" type="text/css" href="../css/style.css" />

<script src="../js/jquery-2.1.1.min.js" type="text/javascript"></script>

</head>

<body>

    <select name="first" id="first" style="width:160px">

        <option value="0">---请选择---</option>

        <option value="1">中国</option>

        <option value="2">美国</option>

        <option value="3">英国</option>

    </select>

    <select name="second" id="second" size="3" style="width:160px"></select>

    <script type="text/javascript">

        $(function() {

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

            id=document.getElementById("first").value;

            $.ajax({

                    url : "../jsp/second2.jsp",

                    dataType : "json",

                    data:"id="+id,

                    success : function(data) {

                        var cttylist=eval(data);

                        var seconddd = document.getElementById("second");

                        seconddd.innerHTML=null;

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

                                    var op = document.createElement("option");

                                    op.innerHTML = cttylist[i].name;

                                    seconddd.appendChild(op);

                        }

                    },

                    error : function(data) {

                        alert(data);

                    }

                });

            });

        });

    </script>

</body>

</html>

jsp

<%@ page language="java" import="java.util.*,com.sy.City,com.sy.CityService,net.sf.json.JSONArray" pageEncoding="ISO-8859-1"%>

<%

    //接受传过来的数据

    String strid=(String)request.getParameter("id");

    Integer id=Integer.parseInt(strid);

    //根据id获得书名列表

    List<City> citylist=new CityService().getCityByCategory(id);

    //设置传输编码

    response.setContentType("text/html;charset=UTF-8");

    //将json解析后输出到前台

    out.println(JSONArray.fromObject(citylist));

%>

java City.java

package com.sy;

public class City {

Integer cid;

String cname;

public Integer getId() {

    return cid;

}

public void setId(Integer id) {

    this.cid = id;

}

public String getName() {

    return cname;

}

public void setName(String cname) {

    this.cname = cname;

}

public City(Integer cid, String cname) {

    super();

    this.cid = cid;

    this.cname = cname;

}

}

java CityService.java

package com.sy;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

public class CityService {

    static Map<Integer , List<City>> CityDb = new HashMap<Integer , List<City>>();

    static {

        List<City> list1 = new ArrayList<City>();

        List<City> list2 = new ArrayList<City>();

        List<City> list3 = new ArrayList<City>();

        list1.add(new City(1 , "山东"));

        list1.add(new City(1 , "北京"));

        list1.add(new City(1 , "上海"));

        list2.add(new City(2 , "美1"));

        list2.add(new City(2 , "美2"));

        list3.add(new City(3 , "英1"));

        list3.add(new City(3 , "英2"));

        list3.add(new City(3 , "英3"));

        CityDb.put(1 , list1);

        CityDb.put(2 , list2);

        CityDb.put(3 , list3);

    }

    public List<City> getCityByCategory(int categoryId) {

        return CityDb.get(categoryId);

    }

}

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虚拟数据库_json_ajax

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