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Struts中用PlugIn扩展Hibernate的例子

王朝other·作者佚名  2008-05-19
窄屏简体版  字體: |||超大  

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.<br<br

* 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

 
 
 
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