ParentTag

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TagParent.jsp
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<%@ page contentType="text/html;charset=Windows-31J" %>
<%@ taglib uri="/WEB-INF/tag.tld" prefix="myTag" %>

<html>

<head>
<title>Tag Parent Example</title>
</head>

<body>

BEFORE TAG

<hr/>
<myTag:grandFather>
  <myTag:father>
    <myTag:child>
    </myTag:child>
  </myTag:father>
</myTag:grandFather>
<hr/>

AFTER TAG

</body>

</html>

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GrandFatherTag?.java

package com.snail.sjcwc;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

public class GrandFatherTag extends TagSupport {
	public int doStartTag() throws JspException {
		return EVAL_BODY_INCLUDE;
	}
}

FatherTag?.java

package com.snail.sjcwc;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;

public class FatherTag extends TagSupport {
	public int doStartTag() throws JspException {
		return EVAL_BODY_INCLUDE;
	}

}

ChildTag?.java

package com.snail.sjcwc;

import java.io.IOException;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.Tag;
import javax.servlet.jsp.tagext.TagSupport;

public class ChildTag extends TagSupport {

	private static final long serialVersionUID = -6986462986227245430L;

	public int doStartTag() throws JspException {
		try {
			pageContext.getOut().print(
					"親タグは、" + getParent().getClass().getName() + " です<br/>");

			Class klass = GrandFatherTag.class;
			Tag t = findAncestorWithClass(this, klass);
			if (t == null) {
				pageContext.getOut()
						.print(klass.getName() + " には囲まれていません<br/>");
			} else {
				pageContext.getOut().print(klass.getName() + " には囲まれています<br/>");
			}

			Class klass2 = TagBodyExam.class;
			Tag t2 = findAncestorWithClass(this, klass2);
			if (t2 == null) {
				pageContext.getOut().print(
						klass2.getName() + " には囲まれていません<br/>");
			} else {
				pageContext.getOut()
						.print(klass2.getName() + " には囲まれています<br/>");
			}

		} catch (IOException e) {

			e.printStackTrace();
			return SKIP_BODY;
		}
		return EVAL_BODY_INCLUDE;
	}
}

Java SJC-WC JSP#tagParent

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