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[转载]Struts中用PlugIn扩展Hibernate的例子

原创 Linux操作系统 作者:dinner1007 时间:2019-01-04 07:30:07 0 删除 编辑
Struts中用PlugIn扩展Hibernate的例子
使用Struts的PlugIn技术把HibernateSessionFactory,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.


  * 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 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 SessionFactory 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
  * 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()");
  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:
  
   
  
  
  
  

  
  
  

  
  
  

  
  
  

  
  
  

  
  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

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