baseaction.java

图书管理系统

package fuguo.yy1.base;

/**
 * @author cankongyun
 *
 */
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import fuguo.yy1.dto.User;

public abstract class BaseAction extends Action {


	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		
		//从session中获取用户信息对象
		HttpSession session=request.getSession();
		User _user = (User)session.getAttribute("USER");
		
		//判断用户是否已经登录
		if (_user!= null) {
			try {
				//调用子类的实现方法
				excute(form,request,response);
				return mapping.findForward("success");
			} catch (Exception e) {	}
		}else			
			request.setAttribute("error","<font color='red'>您还没有登录！</font>");
			return mapping.findForward("error");
	}
	
	
	public abstract void excute(ActionForm form,HttpServletRequest request,
			HttpServletResponse response)throws Exception; 
}