1.新建一个web项目
2.因为这里用到了数据库所以我们在lib目录导入Hibernate的jar包、fastjson.jar包及数据库jar包
3.同样导入EasyUI的组件配置，并在新建的html<head></head>中引用
<!-- 1 jQuery的js包 -->
<script type="text/javascript" src="jquery-easyui-1.4.4/jquery.min.js"></script> <!-- 2 css资源 -->
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.4/themes/default/easyui.css"> <!-- 3 图标资源 -->
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.4/themes/icon.css"> <!-- 4 EasyUI的js包 -->
<script type="text/javascript" src="jquery-easyui-1.4.4/jquery.easyui.min.js"></script> <!-- 5 本地语言 -->
<script type="text/javascript" src="jquery-easyui-1.4.4/locale/easyui-lang-zh_CN.js"></script>
4.在src目录下一次建四个包
5.新建一个实体类Area，并生成set和get方法
package com.hh.entity;
public class Area {
private String areaID ; //区域id
private String areaName ; // 区域名称
private String parentID ; // 父级id
public String getAreaID() {
return areaID;
}
public void setAreaID(String areaID) {
this.areaID = areaID;
}
public String getAreaName() {
return areaName;
}
public void setAreaName(String areaName) {
this.areaName = areaName;
}
public String getParentID() {
return parentID;
}
public void setParentID(String parentID) {
this.parentID = parentID;
}
}
6.在dao层建一个类，获取所有的列表
package com.hh.dao; import java.util.ArrayList;
import java.util.List; import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry; import com.hh.entity.Area; public class AreaDAO { Configuration cfg = null ;
ServiceRegistry sr = null ;
SessionFactory sf = null ;
Session se = null ;
Transaction ts = null ; //构造方法
public AreaDAO()
{
//1获取配置文件
cfg = new Configuration().configure() ; //2注册配置
sr = new StandardServiceRegistryBuilder().
applySettings(cfg.getProperties()).build(); } private void init()
{
//3获取SessionFactory
sf = cfg.buildSessionFactory(sr) ; //4产生Session
se =sf.openSession() ; //5启动事务
ts = se.beginTransaction() ;
} private void destroy()
{
ts.commit(); //提交事务 se.close() ;//关闭释放资源 sf.close();//关闭释放资源
} // 获得所有区域列表
public List<Area> showAll(String areaID)
{
List<Area> list = new ArrayList<Area>() ; init() ; Query qu = se.createQuery("from Area where parentID = ? ") ; qu.setString(0, areaID) ; list = qu.list() ; destroy(); return list;
} }
7.在service层建一个类，用来调用基层数据库dao中的方法
package com.hh.service; import java.util.List; import com.hh.dao.AreaDAO;
import com.hh.entity.Area; public class AreaService
{
public List<Area> showAll(String areaID)
{
return new AreaDAO().showAll(areaID) ;
}
}
8.在servlet包中建一个servlet
package com.hh.servlet; import java.io.IOException;
import java.util.List; import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; import com.alibaba.fastjson.JSONArray;
import com.hh.entity.Area;
import com.hh.service.AreaService; /**
* Servlet implementation class AreaServlet
*/
public class AreaServlet extends HttpServlet {
private static final long serialVersionUID = 1L; /**
* @see HttpServlet#HttpServlet()
*/
public AreaServlet() {
super();
// TODO Auto-generated constructor stub
} /**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 转码
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html"); // 接受参数
String areaID = request.getParameter("areaid") ; List<Area> list = new AreaService().showAll(areaID) ; String json = JSONArray.toJSONString(list) ; response.getWriter().write(json);
} /**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
} }
9.html部分
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<!-- 1 jQuery的js包 -->
<script type="text/javascript" src="jquery-easyui-1.4.4/jquery.min.js"></script> <!-- 2 css资源 -->
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.4/themes/default/easyui.css"> <!-- 3 图标资源 -->
<link rel="stylesheet" type="text/css" href="jquery-easyui-1.4.4/themes/icon.css"> <!-- 4 EasyUI的js包 -->
<script type="text/javascript" src="jquery-easyui-1.4.4/jquery.easyui.min.js"></script> <!-- 5 本地语言 -->
<script type="text/javascript" src="jquery-easyui-1.4.4/locale/easyui-lang-zh_CN.js"></script> </head>
<body>
省<input id="sheng" style="width:200px"
class="easyui-combobox" data-options="
missingMessage:'请选择省份',
url:'AreaServlet?areaid=0',
valueField:'areaID',
textField:'areaName',
onSelect:function(area){
$('#shi').combobox('clear');
$('#qu').combobox('clear');
$('#shi').combobox('reload','AreaServlet?areaid='+area.areaID),
$('#qu').combobox('reload','AreaServlet')}" />
市<input id="shi" class="easyui-combobox "
data-options="missMessage:'请选择城市' ,
url:'AreaServlet' ,
valueField:'areaID',
textField:'areaName',
onSelect:function(area){
$('#qu').combobox('clear');
//alert(area.regionID);
$('#qu').combobox('reload','AreaServlet?areaid='+area.areaID)
}"/>
区<input id="qu" class="easyui-combobox "
data-options="missMessage:'请选择区县' ,
url:'AreaServlet' ,
valueField:'areaID' ,
textField:'areaName'" />
</body>
</html>
10.运行servlet，Hibernate正向工程生成表，并填充测试数据
