J2EE-14 迭代标记处理器

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迭代标记处理器

<c:string>
Hello World!
</c:string>

如果实现的是interactionTag，则在执行doEndTag之前会执行doAfterTag，实现跌倒

class StringTag extends TagSupport,BodyTagSupport,SimpleTagSupport{
	private int count;
	doStartTag()
	
	public int doAfterBody() throws JspException{
		count--;
		if(count==0){
			return SKIP_BODY;
		}
		else{
			return EVAL_BODY_AGAIN;
		}
		
	}
}

BodyContent

继承 JspWriter

<c:string count="5">
</c:string>


public class StringTag extends BodyTagSupport {
	public int doStartTag() throws JspException{
		return EVAL_BODY_BUFFERED;//这里一定要返回EVAL_BODY_BUFFERED
	}
	public int doEndTag() throws JspException{
		String str = bodyContext.getString();
		str = str.toUpperCase();
		getPreviousOut().print(str);
		pageContext.getOut().print(str);//错误，将数据输出到新建的缓冲区中了
		retutn EVAL_PAGE;
	}
}