logoutaction.java

采用Struts框架做的网上啤酒买卖系统

package com.cavaness.beer4all.security;

import java.util.Locale;
import javax.servlet.http.*;
import org.apache.struts.action.*;

import com.cavaness.beer4all.common.view.UserView;
import com.cavaness.beer4all.framework.UserContainer;
import com.cavaness.beer4all.framework.Beer4AllBaseAction;
import com.cavaness.beer4all.util.Constants;
import com.cavaness.beer4all.service.Beer4AllService;

//这个类处理检验用户购买商品是否成功，未写完善
public class LogoutAction extends Beer4AllBaseAction {
  //获取一个映射，在配置中是转发至index.jsp
  public ActionForward execute( ActionMapping mapping,
                                ActionForm form,
                                HttpServletRequest request,
                                HttpServletResponse response )
    throws Exception {
    //获得会话对象
    HttpSession session = request.getSession(false);
    //如果会话对象为空
    if(session != null) {
      //如果用户信息库也为空
      if(getUserContainer(request) != null) {
        //创建一个服务工厂
        Beer4AllService serviceImpl = this.getBeer4AllService();
        //从工厂中获得取消一切的服务
        serviceImpl.logout( getUserContainer(request).getUserView().getUsername() );
        //将用户信息清空
        getUserContainer(request).cleanUp();
      }
    }
    //返回一个成功状态的映射
    return mapping.findForward( Constants.SUCCESS_KEY );
  }
}