listcourseforstu.java

学校的课程管理及选课系统

package org.wangsong.service;

import java.util.Iterator;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspWriter;

import org.wangsong.dao.CourseDAO;
import org.wangsong.dao.DAOFactory;
import org.wangsong.domain.CourseForStu;

public class ListCourseForStu
{

	private CourseDAO couDao;

	public CourseDAO getCourseDAO()
	{
		return DAOFactory.getInstance().createCourseDAO();
	}

	public void list(HttpServletRequest request, JspWriter out, String stuid)
			throws Exception
	{
		String tmp = (String) request.getParameter("page");

		if (tmp != null)
		{
			listpage(request, out, Integer.parseInt(tmp), stuid);
		}
		else
		{
			listpage(request, out, 1, stuid);
		}
	}

	public void listpage(HttpServletRequest request, JspWriter out, int page,
			String stuid) throws Exception
	{
		String id, name, prepare, dep, classid, roomid, time, teacher;
		couDao = this.getCourseDAO();
		List list = couDao.getCourseForStu(stuid);

		if (list == null)
		{
			out.print("无可选课程");
			return;
		}

		int total = list.size();
		int count = 0;
		Iterator it = list.iterator();
		CourseForStu cour;

		while (count < (page - 1) * 5 && it.hasNext())
		{
			it.next();
			count++;
		}

		count = 0;

		while (it.hasNext() && count < 5)
		{
			cour = (CourseForStu) it.next();

			id = cour.getId();
			name = cour.getName();
			if (cour.getPrepare().equals("0")) prepare = "无先修课";
			else
				prepare = cour.getPrepare();
			dep = cour.getDep();
			classid = cour.getClassid();
			roomid = cour.getRoomid();
			time = cour.getTime();
			teacher = cour.getTeacher();

			out.print("<tr>" + "<td>" + id + "</td>" + "<td>" + name + "</td>"
					+ "<td>" + prepare + "</td>" + "<td>" + dep + "</td>"
					+ "<td>" + classid + "</td>" + "<td>" + roomid + "</td>"
					+ "<td>" + time + "</td>" + "<td>" + teacher + "</td>");
			out.print("<td><a href=/school/regCourse.do?id=" + stuid + "&classid="
					+ cour.getClassid() + ">注册</a></td><td>");
			count++;
		}
		out.print("<tr><td colspan=5 align=center>");
		out.print("<table width=50% border=0 cellspacing=0><tr>");
		if ((page - 1) > 0) out
				.print("<td width=50% colspan='5'> <a href=/school/displayCourse.do?page="
						+ (page - 1) + ">上一页</a>　&nbsp;&nbsp;&nbsp;&nbsp;");
		else
			out.print("<td width=50% colspan='5'>上一页</td>");
		if ((page - 1) < (total / 5)) out
				.print("<td width=50% colspan='5'><a href=/school/displayCourse.do?page="
						+ (page + 1) + ">下一页</a></td>");
		else
			out.print("<td width=50%  colspan='5'>下一页</td>");
		out.print("</tr></table></td></tr>");
		out.print("</table>");
	}
}