fortag.java

jsp页面的一些关键技术,里面有我上课时的很多例子,大家不妨看看.

package com.allanlxf.tag;

import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

public class ForTag extends TagSupport
{   
    private int begin;
    private int end;
    private int step = 1;
    private String var;
    
    public int doStartTag() throws JspException
    { 
        pageContext.setAttribute(var, begin);
        begin = begin + step;
        return EVAL_BODY_INCLUDE;
    }
    
    public int doAfterBody() throws JspException
    { 
        if(begin > end)
        {
            return SKIP_BODY;
        }
        
        pageContext.setAttribute(var, begin);
        begin = begin + step;        
        return EVAL_BODY_AGAIN;
    }
    
    public void setBegin(int begin)
    {
        this.begin = begin;
    }
    
    public void setEnd(int end)
    {
        this.end = end;
    }
    
    public void setStep(int step)
    {
        this.step = step;
    }
    
    public void setVar(String var)
    {
        this.var = var;
    }    
}