servicefactory.java

采用Struts框架做的网上啤酒买卖系统

package com.cavaness.beer4all.service;

import org.apache.struts.action.*;
import org.apache.struts.config.ModuleConfig;
import javax.servlet.ServletContext;
import com.cavaness.beer4all.util.Constants;

public class ServiceFactory implements PlugIn{
  private String serviceClassName;
  private ActionServlet servlet;
  public ServiceFactory() {
  }

  public String getServiceClassName() {
   return serviceClassName;
 }
 public void setServiceClassName(String serviceClassName) {
   this.serviceClassName = serviceClassName;
 }

 public Beer4AllService createService() throws ServiceStartupException
 {
   Beer4AllService server = null;
   try
   {
     Class cls = Class.forName(getServiceClassName());
     server=(Beer4AllService)cls.newInstance();
   }
   catch(Exception e)
   {
     e.printStackTrace();
     throw new ServiceStartupException(e);
   }
   return server;
 }


  public void destroy() {
    ServletContext context = servlet.getServletContext();
    context.setAttribute(Constants.SERVICE_FACTORY_KEY, null);
    this.servlet=null;
  }

  public void init(ActionServlet actionServlet, ModuleConfig moduleConfig) {
    this.servlet=actionServlet;
    ServletContext context = servlet.getServletContext();
    context.setAttribute(Constants.SERVICE_FACTORY_KEY, this);
  }
}