package com.scce.servlet;
 
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import net.sf.json.JSONArray;
 
import com.scce.pojo.City;
import com.scce.pojo.Prov;
 
public class LoadAreaServlet extends HttpServlet {
 
   
   
  private static final long serialVersionUID = 1L;
 
  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
      this.doPost(request, response);
  }
 
   
  public void doPost(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    response.setContentType("text/html;charset=utf-8");
    request.setCharacterEncoding("utf-8");
    PrintWriter out = response.getWriter();
    ArrayList<Prov> provs = new ArrayList<Prov>();
    String provinceID = request.getParameter("provinceID");
    if (provinceID=="" || provinceID==null) {
      System.out.println("加載地級市信息");
    Prov pro1 = new Prov();
    pro1.setId(0);
    pro1.setProvinceName("湖北");
    Prov pro2 = new Prov();
    pro2.setId(1);
    pro2.setProvinceName("湖南");
    Prov pro3 = new Prov();
    pro3.setId(2);
    pro3.setProvinceName("廣東");
    Prov pro4 = new Prov();
    pro4.setId(3);
    pro4.setProvinceName("廣西");
    provs.add(pro1);
    provs.add(pro2);
    provs.add(pro3);
    provs.add(pro4);
    System.out.println(JSONArray.fromObject(provs).toString()); //[{"id":0,"provinceName":"湖北"},{}]
    out.print(JSONArray.fromObject(provs).toString());
    }else{
      ArrayList<City> citys = new ArrayList<City>();
      if (provinceID.equals("0")) {
        City city1 = new City();
        city1.setId(0);
        city1.setCityName("武漢市");
        City city2 = new City();
        city2.setId(1);
        city2.setCityName("黃石市");
        City city3 = new City();
        city3.setId(2);
        city3.setCityName("十堰市");
        citys.add(city1);
        citys.add(city2);
        citys.add(city3);
      }
      if (provinceID.equals("1")) {
        City city1 = new City();
        city1.setId(0);
        city1.setCityName("長沙市");
        City city2 = new City();
        city2.setId(1);
        city2.setCityName("岳陽市");
        City city3 = new City();
        city3.setId(2);
        city3.setCityName("湘潭市");
        citys.add(city1);
        citys.add(city2);
        citys.add(city3);
      }
      System.out.println(JSONArray.fromObject(citys).toString());
      out.print(JSONArray.fromObject(citys).toString());
    }  
  }
   
 
}

2.test1.html

<!DOCTYPE html>
<html>
 <head>
  <title>chapter4-test1</title>
   
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="this is my page">
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
   
  
 
 <link rel="stylesheet" href="../UI/themes/icon.css" type="text/css"></link>
  
 <link rel="stylesheet" href="../UI/themes/default/easyui.css" type="text/css"></link>
  
 <!-- <script type="text/javascript" src="../js/jquery-1.8.2.min.js"></script> -->
 <script type="text/javascript" src="../UI/jquery.min.js"></script>
 <script type="text/javascript" src="../UI/jquery.easyui.min.js"></script>
  
 <script type="text/javascript" src="../UI/locale/easyui-lang-zh_CN.js"></script>
 <script type="text/javascript">
 //LoadAreaServlet
  /* var dataCombobox=[{"id":1,"provinceName":"湖北省"}, 
    {"id":2,"provinceName":"湖南省","selected":true},
    {"id":3,"provinceName":"河北省"},
    {"id":4,"provinceName":"河南省"}
  ]; */
 $(function () {
       $("#province").combobox({
         width: 150,
         valueField: 'id', //1
         textField: 'provinceName', // 湖北省              
         editable: false,
        // data:dataCombobox //指定下拉列表的數(shù)據(jù)源
        url:'../LoadAreaServlet',
        method:'post',
        onLoadSuccess:function(data){
           
          var provId = $("#province").combobox("getValue");
           
          loadCity(provId);
        },
        onSelect:function(recode){
          loadCity(recode.id);
        }
         
       });
     });
 
     function loadCity(provId){
       $("#city").combobox({
         width: 150,
         valueField: 'id', //1
         textField: 'cityName', // 湖北省              
         editable: false,
        // data:dataCombobox //指定下拉列表的數(shù)據(jù)源
        url:'../LoadAreaServlet?provinceID='+provId,
        method:'post'
       });
     }
  
 </script>
 </head>
  
 <body> 
  ?。?
  <select id="province" >
     <option value="0">數(shù)據(jù)加載中..</option>
        
  </select>
  <br/>
   
  市：
  <select id="city" >
     <option value="">數(shù)據(jù)加載中..</option>
  </select>
  
  
 </body>
</html>

以上就是本文的全部內(nèi)容，希望對大家學(xué)習(xí)java程序設(shè)計有所幫助。

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