How can JSP 2.0 Tag Files be used for efficient HTML template inheritance?-javaTutorial-php.cn

How can JSP 2.0 Tag Files be used for efficient HTML template inheritance?

Mary-Kate Olsen

Release： 2024-12-02 02:45:09

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How can JSP 2.0 Tag Files be used for efficient HTML template inheritance?

JSP Template Inheritance for HTML Templating

JSP 2.0 Tag Files offer a simple and versatile approach to template inheritance. Here's how to achieve it:

Base Template (base.tag)

<%@tag description="Simple Wrapper Tag" pageEncoding="UTF-8"%>
<html><body>
  <jsp:doBody/>
</body></html>

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Example Page (example.jsp)

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="t" tagdir="/WEB-INF/tags" %>

<t:wrapper>
    <h1>Welcome</h1>
</t:wrapper>

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This will output:

<html><body>
<h1>Welcome</h1>
</body></html>

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Extending the Template

To add header and footer sections to a page:

Generic Page Template (genericpage.tag)

<%@tag description="Overall Page template" pageEncoding="UTF-8"%>
<%@attribute name="header" fragment="true" %>
<%@attribute name="footer" fragment="true" %>
<html>
  <body>
    <div>

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Example Page (userpage.jsp)

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="t" tagdir="/WEB-INF/tags" %>

<t:genericpage>
    <jsp:attribute name="header">
      <h1>Welcome ${userName}</h1>
    </jsp:attribute>
    <jsp:attribute name="footer">
      <p>

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Reusable User Detail Fragment (userdetail.tag)

<%@tag description="User Page template" pageEncoding="UTF-8"%>
<%@tag import="com.example.User" %>
<%@attribute name="user" required="true" type="com.example.User"%>

First Name: ${user.firstName} <br/>
Last Name: ${user.lastName} <br/>
Phone: ${user.phone}<br/>

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Example Page (using userdetail.tag)

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="t" tagdir="/WEB-INF/tags" %>

<t:userpage userName="${user.fullName}">
  <p>
    <t:userdetail user="${user}"/>
  </p>
</t:userpage>

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