esimpleplugin.java

这是一个轻便的j2ee的web应用框架,是一个在多个项目中运用的实际框架,采用struts,hebinate,xml等技术,有丰富的tag,role,navigation,session,dictio

package com.esimple.framework.web.init;

import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.ServletContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.ActionServlet;
import org.apache.struts.action.PlugIn;
import org.apache.struts.config.ModuleConfig;

import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.core.io.UrlResource;

import com.esimple.framework.bean.*;
import com.esimple.framework.util.StringUtils;

/**
 *  Initializes Spring bean factory and makes it available through the servlet
 *  context
 *
 *@author     steven
 *@version    0.9
 */

public final class ESimplePlugIn implements PlugIn {

    /**  The key the factory is stored under in the servlet context */
    public final static String BEAN_FACTORY = "BEAN_FACTORY";

    /**  The logging instance */
    private Log log = LogFactory.getLog(this.getClass());

    /**  The location of the Spring bean configuration file */
    private String beansConfig = "/WEB-INF/spring-beans.xml";
    
	private String defaultDao = "defaultDAO";

    /**  The servlet context */
    private ServletContext context = null;

    /**  The bean factory */
    private DefaultListableBeanFactory factory = null;


	/**
	 *  Gets the path of the Spring bean configuration
	 *
	 *@return    The beansConfig value
	 */
	public String getDefaultDao() {
		return (this.defaultDao);
	}

	/**
	 *  Sets the path of the Spring bean configuration
	 *
	 *@param  beansConfig  The path from the servlet context
	 */
	public void setDefaultDao(String defaultDao) {
		this.defaultDao = defaultDao;
	}


    /**
     *  Gets the path of the Spring bean configuration
     *
     *@return    The beansConfig value
     */
    public String getBeansConfig() {
        return (this.beansConfig);
    }

    /**
     *  Sets the path of the Spring bean configuration
     *
     *@param  beansConfig  The path from the servlet context
     */
    public void setBeansConfig(String beansConfig) {
        this.beansConfig = beansConfig;
    }

    /**  Gracefully remove the Spring bean factory  */
    public void destroy() {
        log.info("Destroying spring plugin");

        context.removeAttribute(BEAN_FACTORY);
        context = null;
        factory = null;
    }

    /**
     *  Initialize and load the Spring bean factory
     *
     *@param  servlet               The ActionServlet for this web application
     *@param  config                The ApplicationConfig for our owning module
     *@exception  ServletException  if we cannot configure ourselves correctly
     */
    public void init(ActionServlet servlet, ModuleConfig config)
        throws ServletException {
		
		
        log.info("Initializing spring plug in from '" + beansConfig + "'");

        context = servlet.getServletContext();
		context.setAttribute("defaultDao", defaultDao);
		
        factory = (DefaultListableBeanFactory) context.getAttribute(BEAN_FACTORY);
        if (factory == null) {
			List bxf = new ArrayList();
			try{
				String[] paths = StringUtils.split(beansConfig,",",true,true);
	            
				for ( int i = 0; i< paths.length; i++){
					bxf.add( 
						new UrlResource(
							servlet.getServletContext().getResource( paths[i] )
						)
					);       
				}
			}catch(Exception e) {
				throw new ServletException(e);
			}
			BeanContainerFactory bcf = BeanContainerFactory.getInstance();
			bcf.initFromURL(bxf);
			
			BeanContainer bc = BeanContainerFactory.getBeanContainer();
            context.setAttribute(BEAN_FACTORY, bc.getFactory());
        }//if end
    }

}