hibetnate源码第一句

Configuration configuration = new Configuration().configure();

关于这一句的源码解读

1.调用configure()方法，configure()调用重载configure(String str)方法   资源文件   /hibernate.cfg.xml

public Configuration configure() throws HibernateException {
    configure( "/hibernate.cfg.xml" );
    return this;
}

public Configuration configure(String resource) throws HibernateException {
    LOG.configuringFromResource( resource );
    InputStream stream = getConfigurationInputStream( resource );
    return doConfigure( stream, resource );
}

2.getConfigurationInputStream(String str)  调用 ConfigHelper.getResourceAsStream(String str)方法 来获取一个输入流

public static InputStream getResourceAsStream(String resource) {

3.在重载configure(String str)中，调用doConfigure(Stream stream,String resource)

protected Configuration doConfigure(InputStream stream, String resourceName) throws HibernateException {
    try {
            ErrorLogger errorLogger = new ErrorLogger( resourceName );
            Document document = xmlHelper.createSAXReader( errorLogger,  entityResolver )
            .read( new InputSource( stream ) );
            if ( errorLogger.hasErrors() ) {
               throw new MappingException( "invalid configuration", errorLogger.getErrors().get( 0 ));
               }
            doConfigure( document );
        }
   catch (DocumentException e) {
            throw new HibernateException( "Could not parse configuration: " + resourceName, e );
    }
    finally {
            try {
                stream.close();
            }
            catch (IOException ioe) {
                LOG.unableToCloseInputStreamForResource( resourceName, ioe );
            }
    }
    return this;
}

4. 1).根据资源名称获取日志

   2).然后利用获得的inputStream流获取文档对象

   3).如果日志有错误，抛异常

   4).否则就调用重载方法doConfigure(doc) 读取文档文件

5.获取根元素sfNode，session-factory , 然后获取name

6.addProperties( sfNode );

parseSessionFactory( sfNode, name );

添加到Properties文件中,