teachernametag.java

学生信息管理系统

package tagext;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.jsp.tagext.Tag;
import java.io.IOException;
import conn.ConnectDB;
import dao.TeacherNameDAO;
import vo.TeacherNameVO;
import java.util.ArrayList;
public class TeacherNameTag implements Tag
{
	private PageContext context=null;
	private Tag parent=null;
	public void setPageContext(PageContext context)
	{
		this.context=context;
	}
	public void setParent(Tag parent)
	{
		this.parent=parent;
	}
	public Tag getParent()
	{
		return this.parent;
	}
	
	public int doStartTag()throws JspException
	{
			TeacherNameDAO teachernamedao=new TeacherNameDAO();
			ArrayList teachers=teachernamedao.getTeacherNames();
			JspWriter out=this.context.getOut();
			try
			{
				TeacherNameVO teachernamevo=null;
				out.println("<select name=teachers>");
				for(int i=0;i<teachers.size();i++)
				{
					teachernamevo=(TeacherNameVO)teachers.get(i);
					out.println("<option value="+teachernamevo.getTeacherId()+">"+teachernamevo.getTeacherName());
				}
					out.println("</select>");
			}
			catch(Exception e)
			{
				e.printStackTrace();
			}
			
	
		return this.SKIP_BODY;
	}
	public int doEndTag()throws JspException
	{
		return this.EVAL_PAGE;
	}
	public void release()
	{
		context=null;
		parent=null;
	
	}
}