listclassesfortea.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.ClassesDAO;
import org.wangsong.dao.DAOFactory;
import org.wangsong.domain.ClassesForTea;
 

public class ListClassesForTea
{
	private ClassesDAO cladao;

	public ClassesDAO getCourseDAO()
	{
		return DAOFactory.getInstance().createClassesDAO();
	}

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

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

	public void listpage(HttpServletRequest request, JspWriter out, int page,
			String teaid) throws Exception
	{
		String classid,classname;
		cladao = this.getCourseDAO();
		List list = cladao.getClassesForTea(teaid);

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

		int total = list.size();
		int count = 0;
		Iterator it = list.iterator();
		ClassesForTea classesfortea;

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

		count = 0;

		while (it.hasNext() && count < 5)
		{
			 classesfortea = (ClassesForTea) it.next();
             classid=classesfortea.getClassid();
             classname=classesfortea.getClassname();
            // System.out.print("班级ID："+classid);
            // System.out.print("班级姓名："+classname);
			out.println("<tr>"+"<td>"+classid+ "</td>" + "<td>"+classname+"</td>");
			out.print("<td><a href=/school/teaStuInfo.do?id="+classid+">选择</a></td></tr>");
			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/teaClassesInfo.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/teaClassesInfo.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>");
	}
}