Hibernate框架简述 (二)

设计映射文件TRegister.hbm.xml

< xml version="1.0" encoding="utf-8" >
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

设计hibernate基础类HibernateUtil.java

package hibernate;
/**
* hibernate 基础类
* @author fengyan
* date 2007-01-09 02:32
*/
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {

private static final SessionFactory sessionFactory;

static
{
try
{
Configuration config = new Configuration().configure("/hibernate/hibernate.cfg.xml");
sessionFactory = config.buildSessionFactory();
}
catch(Throwable e)
{
throw new ExceptionInInitializerError(e);
}
}

public static final ThreadLocal session = new ThreadLocal();

public static Session currentSession() throws HibernateException
{
Session s = (Session)session.get();
//Open a new Session,if this Thread has none yet
if(s == null || !s.isOpen())
{
s = sessionFactory.openSession();
session.set(s);
}
return s;
}

public static void closeSession() throws HibernateException
{
Session s = (Session)session.get();
session.set(null);
if(s != null)
s.close();
}

}

设计控制类

package hibernate.servlet;
/**
* @author fengyan
* date 2007-01-09 02:44
* 设计Hibernate控制类
*/
import hibernate.HibernateUtil;
import hibernate.PO.TRegister;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;

public class RegisterServlet extends HttpServlet {

private static final String CONTENT_TYPE = "text/html;charset=GBK";
public void init() throws ServletException {
// Put your code here
}
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}

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

response.setContentType(CONTENT_TYPE);
request.setCharacterEncoding("GBK");

PrintWriter out = response.getWriter();

String userName = request.getParameter("userName");
String userPwd = request.getParameter("userPwd");
String sex = request.getParameter("sex");
int age = Integer.parseInt(request.getParameter("age"));

TRegister rg = new TRegister();
rg.setAge(age);
rg.setSex(sex);
rg.setUserName(userName);
rg.setUserPwd(userPwd);

Session session = HibernateUtil.currentSession();//生成Session实例
Transact