下面是JSP项目中，hibernate技术中的一个代码，帮忙说说这个代码是做什么用的
package cn.myexam.hibernate;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;

import org.hibernate.HibernateException;

import org.apache.struts.action.ActionServlet;
import org.apache.struts.action.PlugIn;
import org.apache.struts.config.ModuleConfig;


public class InitHibernate implements PlugIn {

private Context ctx;

public void destroy() {

if (ctx != null) {
try {

ctx.unbind("HibernateSessionFactory");
} catch (NamingException e) {
e.printStackTrace();
}
}
if (HibernateSessionFactory.getSessionFactory() != null) {
try {

HibernateSessionFactory.getSessionFactory().close();
} catch (HibernateException e) {
e.printStackTrace();
}

}
}


public void init(ActionServlet servlet, ModuleConfig config)
throws ServletException {
try {

HibernateSessionFactory.rebuildSessionFactory();

if(HibernateSessionFactory.getSessionFactory()!=null)
System.out.println("SessionFactory has be successfully builded!");
} catch (HibernateException ex) {
throw new RuntimeException(
"Exception building SessionFactory: " + ex.getMessage(),
ex);
}

try {

ctx = new InitialContext();

ctx.bind("HibernateSessionFactory", HibernateSessionFactory.getSessionFactory());
} catch (NamingException ex) {
throw new RuntimeException(
"Exception binding SessionFactory to JNDI: " + ex.getMessage(),
ex);
}
}
帮忙详细说说每个函数是做什么用的
[解决办法]
这个应该是在写一个过滤器，但是具体哪个方法做什么我也不是很清楚。你可以看一下过滤器相关的知识
[解决办法]
初始化啊，destory()销毁当前的HibernateSessionFactory
init()重新实例化一个SessionFactory绑定到jndi上以供使用。
[解决办法]
hibernate链接数据库的工程类
[解决办法]

public void destroy() {//这个方法销毁HibernateSessionFactory

if (ctx != null) { 
try { 
ctx.unbind("HibernateSessionFactory"); //从上下文中解除原来的HibernateSessionFactory如果存在的话
} catch (NamingException e) { 
e.printStackTrace(); 
} 
} 
if (HibernateSessionFactory.getSessionFactory() != null) { 
try { 

HibernateSessionFactory.getSessionFactory().close(); //关闭原来的HibernateSessionFactory如果存在的话
} catch (HibernateException e) { 
e.printStackTrace(); 
} 

} 
} 

public void init(ActionServlet servlet, ModuleConfig config) //这个方法重新绑定一个HibernateSessionFactory到上下文中
throws ServletException {  
 
try { 

HibernateSessionFactory.rebuildSessionFactory();//重建

if(HibernateSessionFactory.getSessionFactory()!=null)
System.out.println("SessionFactory has be successfully builded!");
} catch (HibernateException ex) { 
throw new RuntimeException( 
"Exception building SessionFactory: " + ex.getMessage(), 
ex); 
} 

try { 

ctx = new InitialContext(); 

ctx.bind("HibernateSessionFactory", HibernateSessionFactory.getSessionFactory()); //绑定前面经过重建的HibernateSessionFactory到上下文中
} catch (NamingException ex) { 
throw new RuntimeException( 
"Exception binding SessionFactory to JNDI: " + ex.getMessage(), 
ex); 
}