看下面的類:
HibernateSessionFactory.java
package zy.pro.wd.util;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.cfg.Configuration;
/**
* Configures and provides access to Hibernate sessions, tied to the
* current thread of execution. Follows the Thread Local Session
* pattern, see {@link http://hibernate.org/42.html}.
*/
public class HibernateSessionFactory {
/**
* Location of hibernate.cfg.xml file.
* NOTICE: Location should be on the classpath as Hibernate uses
* #resourceAsStream style lookup for its configuration file. That
* is place the config file in a Java package - the default location
* is the default Java package.
* Examples:
* CONFIG_FILE_LOCATION = "/hibernate.conf.xml".
* CONFIG_FILE_LOCATION = "/com/foo/bar/myhiberstuff.conf.xml".
*/
private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
/** Holds a single instance of Session */
private static final ThreadLocal threadLocal = new ThreadLocal();
/** The single instance of hibernate configuration */
private static final Configuration cfg = new Configuration();
/** The single instance of hibernate SessionFactory */
private static net.sf.hibernate.SessionFactory sessionFactory;
/**
* Returns the ThreadLocal Session instance. Lazy initialize
* the SessionFactory if needed.
*
* @return Session
* @throws HibernateException
*/
public static Session currentSession() throws HibernateException {
Session session = (Session) threadLocal.get();
if (session == null) {
if (sessionFactory == null) {
try {
cfg.configure(CONFIG_FILE_LOCATION);
sessionFactory = cfg.buildSessionFactory();
}
catch (Exception e) {
System.err.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}
session = sessionFactory.openSession();
threadLocal.set(session);
}
return session;
}
/**
* Close the single hibernate session instance.
*
* @throws HibernateException
*/
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);
if (session != null) {
session.close();
}
}
/**
* Default constructor.
*/
private HibernateSessionFactory() {
}
}
在這個類中,用到了私有構造函數,如粗體部分.
我的調用類:
package zy.pro.td.plugin;
/*
* Created on Oct 4, 2004
*
* To change the template for this generated file go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
import javax.servlet.ServletException;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.action.PlugIn;
import org.apache.struts.config.ModuleConfig;
import javax.naming.Context;
import javax.naming.InitialContext;
import zy.pro.td.util.HibernateSessionFactory;
/**
* @author sunil
*
* This class will initialize hibernate and bind SessionFactory in JNDI at the
* time of application and startup and unbind it from JNDI at the time of application
* shutdown
*/
public class HibernatePlugin
implements PlugIn {
private static final String jndi_hibernate = "jndi_hibernate_factory";
private HibernateSessionFactory hsf;
private String name;
public HibernatePlugin() {
hsf=new HibernateSessionFactory();
}
// This method will be called at the time of application shutdown
public void destroy() {
System.out.println("Entering HibernatePlugIn.destroy()");
//Put hibernate cleanup code here
System.out.println("Exiting HibernatePlugIn.destroy()");
}
//This method will be called at the time of application startup
public void init(ActionServlet actionServlet, ModuleConfig config) throws
ServletException {
System.out.println("Entering HibernatePlugIn.init()");
System.out.println("Value of init parameter " + getName());
//Uncomment next two lines if you want to throw UnavailableException from your servlet
// if(true)
// throw new ServletException("Error configuring HibernatePlugIn");
System.out.println("Exiting HibernatePlugIn.init()");
}
private void bindFactoryToJNDI() {
try {
Context ctx = new InitialContext();
}
catch (Exception e) {
e.printStackTrace();
}
}
public String getName() {
return name;
}
public void setName(String string) {
name = string;
}
}
在調用類中,我創建了一個HibernateSessionFactory的對象,但是在初始化時,卻出了問題.總提示說:
HibernateSessionFactory() has private access in zy.pro.td.util.HibernateSessionFactory at line 35(35:9)
然後,我就將HibernateSessionFactory的構造函數由private改成了public,調試通過.
構造函數為私有,就不能創建該類的對象.
