使用Struts的PlugIn技术把HibernateＳessionFactory，具体过程如下：
（1）创建HibernateSessionFactory.java，代码如下：
package zy.pro.td.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.brbr * Examples: br * codeCONFIG_FILE_LOCATION = "/hibernate.conf.xml". * CONFIG_FILE_LOCATION = "/com/foo/bar/myhiberstuff.conf.xml"./code */ private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml"; /** Holds a single instance of Session */ private final ThreadLocal threadLocal = new ThreadLocal(); /** The single instance of hibernate configuration */ private final Configuration cfg = new Configuration(); /** The single instance of hibernate SessionFactory */ private net.sf.hibernate.SessionFactory sessionFactory; /** * Returns the ThreadLocal Session instance. Lazy initialize * the codeSessionFactory/code if needed. * * @return Session * @throws HibernateException */ public 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 void closeSession() throws HibernateException { Session session = (Session) threadLocal.get(); threadLocal.set(null); if (session != null) { session.close(); } } /** * Default constructor. */ public HibernateSessionFactory() { } }
（2） 创建HibernatePlugIn.java，代码如下：
package zy.pro.td.plugin; /* * Created on Oct 4, 2004 * * To change the template for this generated file go to * WindowPreferencesJavaCode GenerationCode 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()"); bindFactoryToJNDI(); } private void bindFactoryToJNDI() { try { Context ctx = new InitialContext(); ctx.bind(this.jndi_hibernate,hsf); System.out.println("bindind the hibernate factory to JNDI successfully"); } catch (Exception e) { e.printStackTrace(); } } public String getName() { return name; } public void setName(String string) { name = string; } }
（3） 配置Struts-config.xml,如下：
？xml version="1.0" encoding="UTF-8"？!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd" struts-config form-beans form-bean name="userActionForm"type="zy.pro.td.controller.UserActionForm" / /form-beans action-mappings action name="userActionForm" path="/act/log/login" scope="request" type="zy.pro.td.controller.LoginAction" / /action-mappings plug-in className="org.apache.struts.tiles.TilesPlugin" set-property property="definitions-config" value="/WEB-INF/tiles-defs.xml" / /plug-in plug-in className="org.apache.struts.validator.ValidatorPlugIn" set-property property="pathnames" value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml" / /plug-in plug-in className="zy.pro.td.plugin.HibernatePlugin" / plug-in className="zy.pro.td.plugin.HibernateSessionFactoryPlugIn" / /struts-config 这一部分就是你的嵌入代码
（4）创建ActionForm,代码如下：
package zy.pro.td.controller; import org.apache.struts.action.*; import javax.servlet.http.*; public class UserActionForm extends ActionForm { private String password; private String username; public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public ActionErrors validate(ActionMapping actionMapping, HttpServletRequest httpServletRequest) { /**@todo: finish this method, this is just the skeleton.*/ return null; } public void reset(ActionMapping actionMapping, HttpServletRequest httpServletRequest) { } }
（5）创建Action
package zy.pro.td.controller; import org.apache.struts.action.*; import javax.servlet.http.*; import javax.naming.Context; import javax.naming.InitialContext; import net.sf.hibernate.SessionFactory; import net.sf.hibernate
