HibernateUtils

最新推荐文章于 2018-12-02 08:41:52 发布

原创最新推荐文章于 2018-12-02 08:41:52 发布 · 1.3k 阅读

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本文深入探讨了Java Hibernate框架中线程局部会话管理的实现原理及应用，包括配置文件加载、SessionFactory构建、线程本地Session获取与销毁等关键步骤。详细解释了如何在多线程环境下安全地进行持久化操作，确保数据一致性。

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package edu.qfnu.hibernate.common;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class HibernateUtils {
	private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
	private static final ThreadLocal<Session> threadLocal = 
						new ThreadLocal<Session>();
	private static Configuration configuration = new Configuration();
	private static SessionFactory sessionFactory;
	private static String configFile = CONFIG_FILE_LOCATION;
	
	/*静态代码块创建SessionFactory*/
	static{
		try {

			configuration.configure(configFile);
			/*hibernate4.2.4废弃了直接使用buuldSessionFactory()的方法，使用了ServiceRigistry对象*/
			ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()
					.applySettings(configuration.getProperties())
					.buildServiceRegistry();
			sessionFactory = configuration
					.buildSessionFactory(serviceRegistry);

		} catch (Exception e) {
			System.err.println("%%%% Error Creating SessionFactory%%%%");
			e.printStackTrace();
		}	
	}
	
	private HibernateUtils(){
		
	}
	
	/**
	 * 返回ThreadLocal中的session实例
	 */
	public static Session getSession(){
		Session session = (Session)threadLocal.get();
		if(session==null || !session.isOpen()){
			if(sessionFactory == null){
				rebuildSessionFactory();
			}
			session = (sessionFactory!=null)? sessionFactory.openSession() : null;
			threadLocal.set(session);
		}
		return session;
	}
	
	/*返回Hibernate的SessionFactory*/
	public static void rebuildSessionFactory() {
		try {

			configuration.configure(configFile);
			ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()
					.applySettings(configuration.getProperties())
					.buildServiceRegistry();
			sessionFactory = configuration
					.buildSessionFactory(serviceRegistry);
			sessionFactory = configuration.buildSessionFactory(serviceRegistry);
		} catch (Exception e) {
			System.err.println("%%%%Error Creating SessionFactoty %%%%");
		}
	}
	
	/*关闭Session实例并且把ThreadLocal中的副本清除*/
	public static void closeSession(){
		Session session = (Session) threadLocal.get();
		threadLocal.set(null);
		if(session!=null){
			session.close();
		}
	}
	
	/*返回SessionFactory*/
	public static SessionFactory getSessionFactory(){
		return sessionFactory;
	}

	public static Configuration getConfiguration() {
		return configuration;
	}

	public static void setConfigFile(String configFile) {
		HibernateUtils.configFile = configFile;
	}
	
	
}

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