thshownewsaction.java

在线考试功能

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

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;

import com.onlinestudy.domain.News;
import com.onlinestudy.domain.Students;
import com.onlinestudy.service.NewsService;


public class ThShowNewsAction extends DispatchAction {
	
	NewsService nsc;
	//显示新闻类别管理
	public ActionForward newsClasses(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) throws Exception {
		List list = nsc.selectNewsClasses();
		request.setAttribute("list", list);
		request.getRequestDispatcher("news_class_list.jsp").forward(request, response);
		return null;
	}
	
	
	//分页显示新闻列表
	public ActionForward showNewsList(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) throws Exception{
			int currentPage = 1;
			currentPage = Integer.parseInt(request.getParameter("nextpage"));
			System.out.println(currentPage);
			int totalNews = nsc.selectAllNewsId("select id from News");       
			int length = 10;       //读取数据记录数
			String hql = "from News order by date desc";
			int totalPages = (totalNews-1)/length+1;
			if(currentPage < 1){
					currentPage = 1;
				}										
			if(currentPage > totalPages){
				currentPage = totalPages;
			}
			int offset = (currentPage-1)*length;  //开始取数据的下标
			List list = nsc.selectNewsForPage(hql, offset, length);
			request.setAttribute("totalStudents", Integer.toString(totalNews));
			request.setAttribute("totalPages", Integer.toString(totalPages));
			request.setAttribute("currentPage", Integer.toString(currentPage));
			request.setAttribute("list", list);

		request.getRequestDispatcher("news_list.jsp").forward(request, response);
		return null;
	}
	
	
	//显示增加新闻页面
	public ActionForward showAddNews(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) throws Exception {
		List list = nsc.selectNewsClasses();
		request.setAttribute("list", list);
		request.getRequestDispatcher("news_add.jsp").forward(request, response);
		return null;
	}
	
	//显示修改新闻页面
	public ActionForward showUdateNews(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) throws Exception {
			
			int id = Integer.parseInt(request.getParameter("id"));
			News news = nsc.selectNewsById(id);
			List list = nsc.selectNewsClasses();
			request.setAttribute("list", list);
			request.setAttribute("news", news);
			
		request.getRequestDispatcher("news_update.jsp").forward(request, response);
		return null;
	}
	

	public void setNsc(NewsService nsc) {
		this.nsc = nsc;
	}
}