havechildtag.java

自定义标记

package hello;

import javax.servlet.jsp.tagext.BodyTagSupport;

public class haveChildTag extends BodyTagSupport {
	private boolean isOutput;// 是否输出子标签内容

	// ----标签开始时调用此方法-------
	public int doStartTag() {
		if (isOutput)
			return EVAL_BODY_INCLUDE;
		else
			return SKIP_BODY;
	}

	// ----标签结束时调用此方法-------
	public int doEndTag() {
		try {
			if (bodyContent != null)
				bodyContent.writeOut(bodyContent.getEnclosingWriter());
		} catch (Exception e) {
			System.out.println(e);
		}
		return EVAL_PAGE;
	}

	public boolean getIsOutput() {
		return isOutput;
	}

	public void setIsOutput(boolean isOutput) {
		this.isOutput = isOutput;
	}
}