package mytag;import javax.servlet.jsp.*;import javax.servlet.jsp.tagext.*;import java.util.Hashtable;import java.io.Writer;import java.io.IOException;import java.util.List;/** * @author  yeeku.H.lee kongyeeku@163.com * @version  1.0 * <br>Copyright (C), 2005-2008, yeeku.H.Lee * <br>This program is protected by copyright laws. * <br>Program Name: * <br>Date:  */public class MyIteratorTag extends BodyTagSupport{	private String bean;    private String item;    private String scope;    private int i = 0;    private int size;    private List<String> itemList = null;	public void setBean (String s)	{		bean  = s;    }	public void setScope (String s)	{		scope  = s;    }	public String getBean ()	{		return bean;    }	public void setItem (String s)	{		item  = s;    }	public String getItem ()	{		return item;    }	public int doStartTag() throws JspTagException	{        if (scope.equals("page"))        {            itemList = (List<String>)pageContext.getAttribute(bean);        }        else if(scope.equals("request"))        {            itemList = (List<String>)pageContext.getAttribute(bean ,                PageContext.REQUEST_SCOPE);        }        else if(scope.equals("session"))        {            itemList = (List<String>)pageContext.getAttribute(bean ,                PageContext.SESSION_SCOPE);        }        else if(scope.equals("application"))        {            itemList = (List<String>)pageContext.getAttribute(bean ,                PageContext.APPLICATION_SCOPE);        }        if (itemList == null)        {            System.out.println("集合為空");            return SKIP_BODY;        }        //測試用的        System.out.println(itemList);        size = itemList.size();        pageContext.setAttribute(item , itemList.get(i));         return EVAL_BODY_BUFFERED;	}	public int doAfterBody() throws JspException	{        System.out.println("標簽體結束");         i++ ;        if (i >= size)        {            i = 0;            return SKIP_BODY;        }        pageContext.setAttribute(item , itemList.get(i));         return EVAL_BODY_AGAIN;	}	public int doEndTag() throws JspTagException	{        if (itemList == null )        {            return EVAL_PAGE;        }        else        {            try            {                bodyContent.writeOut(pageContext.getOut());            }            catch (IOException ex)            {                throw new JspTagException("錯誤");            }            return EVAL_PAGE;        }	}}