用properties配置hibernate连接数据库信息

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.Properties;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;


public class HibernateUtil {
static SessionFactory sessionFactory = null;

static
{
try
{

final String path = URLDecoder.decode(Thread.currentThread().getContextClassLoader().getResource(
"config.properties").getPath(), "UTF-8"); //config.properties保存的真实路径
final Properties properties = new Properties();
final InputStream fis = new FileInputStream(path); //config.properties 文件对象，里面有数据库的连接信息，
properties.load(fis);
fis.close(); //关流
final String dbhost = properties.getProperty("dbhost"); //数据库IP(从config.properties读)
final String dbport = properties.getProperty("dbport"); //端口(从config.properties读)
final String dbname = properties.getProperty("dbname"); //数据库名(从config.properties读)
final String dbuser = properties.getProperty("dbuser"); //用户名(从config.properties读)
final String dbpw = properties.getProperty("dbpw"); //密码(从config.properties读)

final Properties extraProperties = new Properties();
extraProperties.setProperty("hibernate.connection.url", "jdbc:mysql://" + dbhost + ":" + dbport + "/"
+ dbname + "?zeroDateTimeBehavior=convertToNull");
extraProperties.setProperty("hibernate.connection.username", dbuser);
extraProperties.setProperty("hibernate.connection.password", dbpw);

final Configuration cfg = new Configuration();
cfg.addProperties(extraProperties);
cfg.configure("hibernate.cfg.xml"); //路径可以改变
sessionFactory = cfg.buildSessionFactory();
}
catch (final UnsupportedEncodingException e)
{
//不支持字符编码。
e.printStackTrace();
}
catch (final FileNotFoundException e)
{
//config.properties文件没找到
e.printStackTrace();
}
catch (final HibernateException e)
{
//cfg.configure("hibernate.cfg.xml");时异常
e.printStackTrace();
}
catch (final Exception e)
{
//创建SessionFactory 异常
e.printStackTrace();
}
}

public static SessionFactory getSessionFactory()
{
return sessionFactory;
}

/**
* 取得session
*
* @return session
*/
public static Session getSeesion()
{
return sessionFactory.openSession();
}
}