package jspTagLib;

import java.util.Hashtable;

import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.TagSupport;

public class GetOptionTag extends TagSupport {
    //這個標(biāo)簽實現(xiàn)由哈西表直接處理下拉列表的條目
    //哈西表將直接通過屬性傳進來
    //從這個例子可以看出標(biāo)簽的屬性數(shù)據(jù)類型可以相當(dāng)復(fù)雜

    private Hashtable tablename; 
    
    /*
	    下面是屬性的get和set方法.注意其方法的命名規(guī)則
    */
   
   	public void setTablename(Hashtable tablename)
	{
        this.tablename =tablename;
      }

      public Hashtable getTablename()
      {
  	 return this.tablename;
      }    
 
 public GetOptionTag()throws ClassNotFoundException
 {
    
 }     

  public int doStartTag() throws JspTagException 
  {
		return EVAL_BODY_INCLUDE;
  }    
	
  public int doEndTag()throws JspTagException
  {
     try
     {

     JspWriter out = pageContext.getOut();

     java.util.Enumeration sessionNames =tablename.keys();
     String name;
     
     while (sessionNames.hasMoreElements()) {
         
         name = (String)sessionNames.nextElement();
         out.write("<OPTION value='"+name+"'>"+tablename.get(name).toString()+"</OPTION>");
  
        }
    			
      }
     catch(Exception e)
     {
        throw new JspTagException("不能正確地找到表!"); 
      }
     return EVAL_PAGE;
     }
}