文章标题

A tutorial to show how to integrate Hibernate with in a web application developed with Apache Struts 1.x.

Steps of the integration :

Create a new Hibernate Struts plug-in file to set the Hibernate session factory in servlet context, and include this file in

struts-config.xml

file.

In Struts, get the Hibernate session factory from servlet context, and do whatever Hibernate task you want.

1. Hibernate Struts Plug-in

Create a Hibernate Struts Plug-in, get the Hibernate session factory, store it into the servlet context for later user –

servlet.getServletContext().setAttribute(KEY_NAME, factory);

.

package com.mkyong.common.plugin;

import java.net.URL;
import javax.servlet.ServletException;

import org.apache.struts.action.ActionServlet;
import org.apache.struts.action.PlugIn;
import org.apache.struts.config.ModuleConfig;
import org.hibernate.HibernateException;
import org.hibernate.MappingException;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernatePlugin implements PlugIn {
private Configuration config;
private SessionFactory factory;
private String path = "/hibernate.cfg.xml";
private static Class clazz = HibernatePlugin.class;

public static final String KEY_NAME = clazz.getName();

public void setPath(String path) {
this.path = path;
}

public void init(ActionServlet servlet, ModuleConfig modConfig)
throws ServletException {

try {

//save the Hibernate session factory into serlvet context
URL url = HibernatePlugin.class.getResource(path);
config = new Configuration().configure(url);
factory = config.buildSessionFactory();
servlet.getServletContext().setAttribute(KEY_NAME, factory);

} catch (MappingException e) {
throw new ServletException();
} catch (HibernateException e) {
throw new ServletException();
}

}

public void destroy() {
try {
factory.close();
} catch (HibernateException e) {
e.printStackTrace();
}
}
}

2. struts-config.xml

Include the Hibernate Struts plug-in into the Struts configuration file (

struts-config.xm

l).

<struts-config>
...
<plug-in className="com.mkyong.common.plugin.HibernatePlugin">
<set-property property="path" value="/hibernate.cfg.xml"/>
</plug-in>
...
<struts-config>

3. Get the Hibernate session factory

In Struts action class, you can get the Hibernate session factory from servlet context.

servlet.getServletContext().getAttribute(HibernatePlugin.KEY_NAME);

and do whatever Hibernate task as normal.

package com.mkyong.customer.action;

import java.util.Date;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.hibernate.Session;
import org.hibernate.SessionFactory;

import com.mkyong.common.plugin.HibernatePlugin;
import com.mkyong.customer.form.CustomerForm;
import com.mkyong.customer.model.Customer;

public class AddCustomerAction extends Action{

public ActionForward execute(ActionMapping mapping,ActionForm form,
HttpServletRequest request,HttpServletResponse response)
throws Exception {

SessionFactory sessionFactory =
(SessionFactory) servlet.getServletContext()
.getAttribute(HibernatePlugin.KEY_NAME);

Session session = sessionFactory.openSession();

CustomerForm customerForm = (CustomerForm)form;
Customer customer = new Customer();

//copy customerform to model
BeanUtils.copyProperties(customer, customerForm);

//save it
customer.setCreatedDate(new Date());

session.beginTransaction();
session.save(customer);
session.getTransaction().commit();

return mapping.findForward("success");

}
}

Done.