hibernate

本文介绍如何使用Struts的PlugIn技术整合Hibernate框架。通过创建SessionFactory实例,并将其绑定到JNDI,实现数据库操作的统一管理和资源释放。此外,还展示了ActionForm和Action的编写方式。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

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
  */
  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.<br><br>
  * Examples: <br>
  * <code>CONFIG_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 <code>SessionFactory</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
  * 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:
  <?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
 

Struts中用PlugIn扩展Hibernate的例子Struts中用PlugIn扩展Hibernate的例子2006-7-19 23:43:58Struts中用PlugIn扩展Hibernate的例子2006-7-19 23:43:58Struts中用PlugIn扩展Hibernate的例子
 
 

内容概要:本文《2025年全球AI Coding市场洞察研究报告》由亿欧智库发布,深入分析了AI编程工具的市场现状和发展趋势。报告指出,AI编程工具在2024年进入爆发式增长阶段,成为软件开发领域的重要趋势。AI编程工具不仅简化了代码生成、调试到项目构建等环节,还推动编程方式从人工编码向“人机协同”模式转变。报告详细评估了主流AI编程工具的表现,探讨了其商业模式、市场潜力及未来发展方向。特别提到AI Agent技术的发展,使得AI编程工具从辅助型向自主型跃迁,提升了任务执行的智能化和全面性。报告还分析了AI编程工具在不同行业和用户群体中的应用,强调了其在提高开发效率、减少重复工作和错误修复方面的显著效果。最后,报告预测2025年AI编程工具将在精准化和垂直化上进一步深化,推动软件开发行业进入“人机共融”的新阶段。 适合人群:具备一定编程基础,尤其是对AI编程工具有兴趣的研发人员、企业开发团队及非技术人员。 使用场景及目标:①了解AI编程工具的市场现状和发展趋势;②评估主流AI编程工具的性能和应用场景;③探索AI编程工具在不同行业中的具体应用,如互联网、金融、游戏等;④掌握AI编程工具的商业模式和盈利空间,为企业决策提供参考。 其他说明:报告基于亿欧智库的专业研究和市场调研,提供了详尽的数据支持和前瞻性洞察。报告不仅适用于技术从业者,也适合企业管理者和政策制定者,帮助他们在技术和商业决策中更好地理解AI编程工具的价值和潜力。
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值