bodytag1.java

自定义标记

package body;

import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;

public class bodyTag1 extends BodyTagSupport {
	private int countNum = 0;// 循环显示时间的次数

	private int currentNum = 1;// 当前执行次数

	// ----标签开始时调用此方法-------
	public int doStartTag() {
		try {
			JspWriter out = pageContext.getOut();
			out.print("标签开始了:<br>");
			if (countNum > 0)
				return EVAL_BODY_TAG;
			else
				return SKIP_BODY;

		} catch (Exception e) {
			System.out.println(e);
			return SKIP_BODY;
		}
	}

	// ----标签体执行完后调用此方法----
	public int doAfterBody() {
		try {
			JspWriter out = pageContext.getOut();
			out.print("第" + currentNum + "次执行标签体。标签体执行完毕。<br>");
			if (countNum > 1) {// 如果还需要执行标签体
				countNum--;
				currentNum++;
				return EVAL_BODY_TAG;
			} else
				return SKIP_BODY;
		} catch (Exception e) {
			System.out.println(e);
			return SKIP_BODY;
		}
	}

	// ----标签结束时调用此方法-------
	public int doEndTag() {
		try {
			JspWriter out = pageContext.getOut();
			// ----输出标签体的内容----
			bodyContent.writeOut(bodyContent.getEnclosingWriter());
			out.print("标签结束了。");
		} catch (Exception e) {
			System.out.println(e);
		}
		return EVAL_PAGE;
	}

	public int getCountNum() {
		return countNum;
	}

	public void setCountNum(int countNum) {
		this.countNum = countNum;
		this.currentNum = 1;
	}
}