chakeshowaction.java

学生选课 用java和sql server 2000用asp完成的学生选课管理系统

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package com.xuanke.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
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 com.xuanke.dao.Dao;

/** 
 * MyEclipse Struts
 * Creation date: 01-04-2008
 * 
 * XDoclet definition:
 * @struts.action validate="true"
 * @struts.action-forward name="chakego" path="/chakeshow.jsp"
 */
public class ChakeshowAction extends Action {
	/*
	 * Generated Methods
	 */

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		// TODO Auto-generated method stub
		Dao dao=new Dao();
		int topage = 1;//定义一个变量，用来存储用户的目标页数，也就是说用户要翻到的页数
		if (!(request.getParameter("p") == null)) //从用户的超链接取得目标页数，如果是第一页，那么p一定是空的
		{
			topage = Integer.parseInt(request.getParameter("p"));
			//如果不是第一页，那么p是一定有值
		}
		
		int nextpage = 1;//初始化“下一页”
		int prepage = 1;//初始化“上一页”
		//上一页判断开始
		if (topage > 2)
			prepage = topage - 1;
		else
			prepage = 1;

        //下一页判断开始
		if((topage+1)>dao.chatotalpage())
			//nextpage=new DB().totalpage();
		   nextpage=topage;
		else
			nextpage=topage+1;
		
		request.setAttribute("nextpage", nextpage);//将“下一页”打包
		request.setAttribute("prepage", prepage);//将“上一页”打包
		request.setAttribute("totalpage", dao.chatotalpage());//将“总页数”打包
		request.setAttribute("topage", topage);//将"当前页"打包
		request.setAttribute("res",dao.chapagers(topage));//根据目标页数，得到该页应该显示的那5条记录
		return mapping.findForward("chakego");

	
	}
}