JSP template inheritance

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Coming from a background in Django, I often use \"template inheritance\", where multiple templates inherit from a common base. Is there an easy way to do this in JSP? If not

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心在旅途

2020-12-13 14:42

Rythm Template engine has implemented an elegant approach for template inheritance.

So suppose your layout template (parent template) called main.html:

<h1>@get("title", "default main page")</h1>
<div id="left-panel">@render("leftPanel")<div>
<div id="right-panel">@render("rightPanel")</div>
<div id="main-content">@render()</div>
<div id="footer">
@render("footer"){
   @**
    * the content here is supplied if the child template failed 
    * to provide it's own footer implementation
    *@
   <div class="footer">copyright 2012 ...</div>
}
</div>

And here is your target template:

@extends(main)
@set(title: "My Cool Page")
@section("leftPanel") {
<ul class="menu">
...
</ul>
}

@section("rightPanel") {
<div class="news">
...
</div>
}

@*** note no "footer" section supplied so the default content will be used **@

@*** the rest is for the main content **@
...

Check the real demo at http://rythmengine.com/demo/testdefaultlayoutcontent

A comprehensive document could be found at http://www.playframework.org/modules/rythm. Though it's targeted to Play!Framework, most of the content also apply to pure rythm engine without Play!Framework.

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故里飘歌

2020-12-13 14:50

You'll probably want to look into Tiles.

EDIT: On a related note to tiles, you might want to look into Struts. It's not what you're looking for (that's tiles), but it is useful for someone coming from Django.

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清酒与你

2020-12-13 14:51

You can use rapid-framework for JSP template inheritance

base.jsp

%@ taglib uri="http://www.rapid-framework.org.cn/rapid" prefix="rapid" %>  
<html>  
    <head>
        <rapid:block name="head">
            base_head_content
        </rapid:block>
    </head>  
    <body>  
        <br />  
        <rapid:block name="content">
            base_body_content
        </rapid:block>  
    </body>  
</html>

child.jsp

<%@ taglib uri="http://www.rapid-framework.org.cn/rapid" prefix="rapid" %>  
<rapid:override name="content">  
     <div>
        <h2>Entry one</h2>
        <p>This is my first entry.</p>
    </div>
</rapid:override>  

<!-- extends from base.jsp or <jsp:include page="base.jsp"> -->  
<%@ include file="base.jsp" %>

output

<html>
<head>  
 base_head_content
</head>  
<body>  
    <br />  
    <div>
        <h2>Entry one</h2>
        <p>This is my first entry.</p>
    </div>
</body>  
</html>

source code

http://rapid-framework.googlecode.com/svn/trunk/rapid-framework/src/rapid_framework_common/cn/org/rapid_framework/web/tags/

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盖世英雄少女心

2020-12-13 14:52
My favorite Java web front-end tech is Facelets. It supports the most Django-like templating I've seen. It's not quite as clean as Django's, but you get the same inheritance benefits.

Instead of Django's:

Super:
```
{% block content %}{% endblock %}
```
Sub:
```
{% block content %}inheriting template's content here{% endblock %}
```
Facelet's syntax is like this:

Super:
```
<ui:insert name="content"></ui:insert>
```
Sub:
```
<ui:define name="content">inheriting template's content here</ui:define>
```
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陌清茗

2020-12-13 14:53

Other options worth exploring include Sitemesh, which is built on the idea of page decorators, and Java Server Faces (JSF), which employs web-based UI components. And while we're talking about rapid development with web frameworks on the Java platform, I encourage you to check out Grails. It has the same mission has Django; namely, rapid web app development based on convention over configuration.

Hope that's not too many suggestion for one post. :o)

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时光取名叫无心

2020-12-13 14:54

You can do similar things using JSP tag files. Create your own page.tag that contains the page structure. Then use a <jsp:body/> tag to insert the contents.

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