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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>
* <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
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