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

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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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