份-城市，基于jQuery的AJAX二级联动,用Struts2整合AJAX【非数据库版】

package loaderman.provincecity;

import java.io.IOException;

import java.util.LinkedHashSet;

import java.util.Set;

import com.opensymphony.xwork2.ActionSupport;

/**

 * 控制器*/

public class ProvinceCityAction extends ActionSupport{

    private String province;

    public void setProvince(String province) {

        this.province = province;

        //System.out.println("注入" + province);

    }

    //根据省份查询城市

    public String findCityByProvince() throws Exception {

        System.out.println("进来了");

        setCity = new LinkedHashSet<String>();

        if("湖南".equals(province)){

            setCity.add("长沙");

            setCity.add("株洲");

        }else if("广东".equals(province)){

            setCity.add("广州");

            setCity.add("中山");

            setCity.add("佛山");

        }

        return SUCCESS;

    }

    private Set<String> setCity;

    public Set<String> getSetCity() {

        return setCity;

    }

}

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

   <package name="loaderman" extends="json-default" namespace="/">

           <!-- 根据省份查询城市 -->

           <action

               name="findCityByProvinceRequest"

               class="loaderman.provincecity.ProvinceCityAction"

               method="findCityByProvince">

            <result name="success" type="json"/>

           </action>

   </package>

</struts>

<%@ page language="java" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>省份-城市，基于jQuery的AJAX二级联动</title>

    <script type="text/javascript" src="js/jquery-1.8.2.js"></script>

  </head>

  <body>

    <select id="province">

        <option>选择省份</option>

        <option>湖南</option>

        <option>广东</option>

    </select>

    <select id="city">

        <option>选择城市</option>

    </select>

    <!-- 省份->城市 -->

    <script type="text/javascript">

        //定位省份下拉框，同时添时内容改变事件

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

            //清空原城市下拉框中的内容，除第一项外

            $("#city option:gt(0)").remove();

            //获取选中的省份

            var province = $("#province option:selected").text();

            //如果选中的不是"选择省份"

            if("选择省份"!=province){

                $.ajax( {

                    type    : "POST",

                    url     : "${pageContext.request.contextPath}/findCityByProvinceRequest?time="+new Date().getTime(),

                    data    : {"province":province},

                    success : function(backDate,textStatus,ajax){

                                //alert(backDate!=null?"收到":"为收到");

                                //alert(ajax.responseText);

                                //解析json文本

                                var array = backDate.setCity;

                                  var size = array.length;

                                  for(var i=0;i<size;i++){

                                      var city = array[i];

                                      var $option = $("<option>"+city+"</option>");

                                      $("#city").append($option);

                                  }

                              }

                } );

            }

        } );

    </script>

  </body>

</html>