Inherit jsp page using rapid-framework

1. Use the scene

When developing a jsp page, there are a lot of pages that use the same page structure. These same page structures are not only added when each page is added, but also need to be modified if you want to modify these same places, which brings development and maintenance. The amount of work.

Think through the object-oriented problem: If the same part is extracted, use the inherited relationship, and the basic has the parent class definition, the subclass can override the changed content of the parent class. A parent class can have multiple subclasses. A subclass has only one parent class. A subclass can have many subclasses. This multi-level inheritance can solve the above problem.

The same is true for the page. If you extract the same partial page structure into a parent page, you can use the child page to inherit the parent page from the child page. You can override the page content of the page different from the main page, or you can define the own. The subpage of the page is overwritten. When adding, just importing the parent page and modifying the content for yourself will no longer care about the same page structure. When you want to modify the same page structure, as long as you modify the content of the parent page, the descendant pages referenced below will be updated accordingly.

2. Use rapid

I mainly use it in the jsp page, so I only introduce the jar package that needs to be introduced in jsp: rapid-core-4.0.jar

Maven introduces:

<dependency>
      <groupId>com.googlecode.rapid-framework</groupId>
      <artifactId>rapid-core</artifactId>
      <version>4.0.5</version>
</dependency>

Because this function is mainly used in the jsp page, it is implemented by using the tag library method, so the tag library is first referenced in jsp.

<%@taglib uri="http://www.rapid-framework.org.cn/rapid" prefix="rapid" %>

Parent page: base.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib prefix="rapid" uri="http://www.rapid-framework.org.cn/rapid" %>
<body>
    <rapid:block name="content">
 Here is the content
    </rapid:block>
</body>

<rapid:block name="content">Define a block called content that can be used to rewrite subpages.
subpage: child.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="rapid" uri="http://www.rapid-framework.org.cn/rapid" %>
<rapid:override name="content">
Here is the rewriting content
</rapid:override>
<%@ include file="base.jsp"%>

<%@ include file="base.jsp"%>Introduction to the parent page
<rapid:override name="content">Override the part of the parent page called content.
Access the subpage, the parent page <rapid:block name="content">The internal elements are not displayed, instead of the subpage rewrite.

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