struts和hibernate整合的一种方式（hibernate作为struts插件）

把hibernate用到的包全部放进web应用程序的lib里面，然后定义hibernate.cfg.xml,也就是插件的配置信息，如下

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
                                         "http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="show_sql">false</property>
        <property name="use_outer_join">true</property>
        <property name="hibernate.dialect">net.sf.hibernate.dialect.MySQLDialect</property>
        <property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql:///test</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password"></property>
        <property name="hibernate.connection.pool.size">20</property>
        <property name="session_factory_name">hibernate/session_factory</property>
        <!-- Mapping files -->
    <mapping resource="/homepage/Artical.hbm.xml"/>

    </session-factory>
</hibernate-configuration>
信息很清楚的，就是配置数据库等信息，我们利用jndi来查找SessionFactory,下面是插件程序，HibernatePlugIn.java

import org.apache.struts.action.PlugIn;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.config.ModuleConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletContext;
import net.sf.hibernate.SessionFactory;
import net.sf.hibernate.cfg.Configuration;
public class HibernatePlugIn
    implements PlugIn {
  public void destroy() {
  }
  public void init(ActionServlet servlet, ModuleConfig config) throws
      ServletException {
    try {
      ServletContext context = servlet.getServletContext();
      SessionFactory sf = new Configuration().configure().buildSessionFactory();
      context.setAttribute("net.sf.hibernate.SessionFactory",sf);
    }
    catch (Exception ex) {
      ex.printStackTrace();
    }
  }
}
相应的，要在struts-config.xml配置插件信息，大概如下，注意路径

 <plug-in className="homepage.HibernatePlugIn">
    <set-property property="configFilePath" value="/WEB-INF/classes/hibernate.cfg.xml" />
    <set-property property="storeInServletContext" value="true" />
  </plug-in>

以后就可以利用java.naming.Context,java.naming.InitiaContext来查找

      Context ct = new InitialContext();
      sessions=(SessionFactory) ct.lookup("hibernate/session_factory");
      session=sessions.openSession();

当然，还有另外两种整合方式，我认为这种方法更为灵活，也比较容易掌握

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