inithibernateplugin.java

J2EE SSH 的一个例子

package com.huangdong.dbwebdemo;

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

import net.sf.hibernate.HibernateException;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.cfg.Configuration;

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

/**
 * @author HD
 */
public class InitHibernatePlugin implements PlugIn {

	/**
	 * 插件所获取的容器上下文实例
	 */
	private Context ctx;
	/**
	 * Hibernate初始化好的SessionFactory
	 */
	private SessionFactory sessionFactory;

	/*
	 * 插件销毁方法
	 */
	public void destroy() {
		if (ctx != null) {
			try {
				// unbind JNDI 节点
				ctx.unbind("HibernateSessionFactory");
			} catch (NamingException e) {
				e.printStackTrace();
			}
		}
		if (this.sessionFactory != null) {
			try {
				// 关闭sessionFactory
				sessionFactory.close();
			} catch (HibernateException e) {
				e.printStackTrace();
			}
			this.sessionFactory = null;
		}
	}

	/*
	 * 插件初始化方法
	 */
	public void init(ActionServlet servlet, ModuleConfig config)
		throws ServletException {
		try {
			// 获取SessionFactory的实例
			this.sessionFactory =
				new Configuration().configure().buildSessionFactory();
		} catch (HibernateException ex) {
			throw new RuntimeException(
				"Exception building SessionFactory: " + ex.getMessage(),
				ex);
		}
		try {
			// 取得容器上下文
			ctx = new InitialContext();
			// 将sessionFactory bind到JND树中
			ctx.bind("HibernateSessionFactory", this.sessionFactory);
		} catch (NamingException ex) {
			throw new RuntimeException(
				"Exception binding SessionFactory to JNDI: " + ex.getMessage(),
				ex);
		}
	}

}