I forgot to add the source and jsp file
package test5;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
public final class ShowFieldTag extends TagSupport {
private String field = null;
private int start = 0;
public ShowFieldTag() {
init();
}
public void setField(String name) {
this.field = name;
}
public String getField() {
return this.field;
}
public int getStart() {
return start;
}
public void setStart(int start) {
this.start = start;
}
public int doStartTag() throws JspException {
if (start != 0) {
pageContext.setAttribute("elementIndex", new Integer(start));
}
if (field.startsWith("show")) {
return EVAL_BODY_INCLUDE;
} else {
return SKIP_BODY;
}
}
public int doEndTag() throws JspException {
return EVAL_PAGE;
}
public void release() {
super.release();
init();
}
private void init() {
field = null;
start = 0;
}
}
<%@ page language="java" %>
<%@ taglib uri="/WEB-INF/app.tld" prefix="app" %>
<html>
<head>
<title></title>
</head>
<body>
<h1>test</h1>
<app:showField field="notshow">
<h3>hidden</h3>
</app:showField>
<app:showField field="show">
<h3>show</h3>
<app:showField field="notshow">
<h3>inside</h3>
</app:showField>
<app:showField field="show">
<h3>show inside</h3>
</app:showField>
</app:showField>
</body>
</html>
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