classnametag.java

学生信息管理系统

package tagext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.http.HttpServlet;
import java.io.IOException;
import java.util.ArrayList;
import dao.ClassDAO;
import vo.ClassVO;
public class ClassNameTag implements Tag
{
	private PageContext context=null;
	private Tag parent=null;
	private String name=null;
	public void setPageContext(PageContext context)
	{
		this.context=context;
	}
	public void setParent(Tag parent)
	{
		this.parent=parent;
	}
	public Tag getParent()
	{
		return this.parent;
	}
	public void setName(String name)
	{
		this.name=name;
	}
	public String getName()
	{
		return this.name;
	}
	public int doStartTag()throws JspException
	{
		if(name.equals("class"))
		{
			ClassDAO classdao=new ClassDAO();
			ArrayList classes=classdao.getClasses();
			JspWriter out=this.context.getOut();
			try
			{
				ClassVO classvo=null;
				out.println("<select name=classes>");
				for(int i=0;i<classes.size();i++)
				{
					classvo=(ClassVO)classes.get(i);
					out.println("<option value="+classvo.getClassId()+">"+classvo.getClassName());
				}
				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;
		name=null;
	}
}