1、 What is static import ？
Static import refers to , Embed an external file into the current JSP In file , At the same time, analyze the JSP sentence , It will also include other compilation instructions for the target page .
include The static import instructions of use syntax ：
<%@include file="relativeURLSpec"%>
Examples of static import usage include1.jsp：
<%@ page contentType="text/html; charset=utf-8" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> static state include Example </title>
</head>
<body>
<!-- Use include Compile the specified import page -->
<%@include file="error.jsp"%>
</body>
</html>
among error.jsp It's a simple error handling page , The code is as follows ：
<%@ page contentType="text/html; charset=utf-8" language="java" isErrorPage="true" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> Error page </title>
</head>
<body>
This is an error handling page </br>
</body>
</html>
stay tomcat Run the static include After example , View the generated servlet Class can see the following code snippet
（ View by ：windows Next , find tomcat Install under directory work Folder , Get into Catalina Under folder localhost Folder , Find the folder where the current project is located , find org Catalog , Into the next apache In the catalog jsp Folder , You can see a include1_jsp.java file , That's what it's about include1.jsp Corresponding generated servlet class .ps： I put this test page on webDemo Under the , So my catalog is \apache-tomcat-7.0.47\work\Catalina\localhost\webDemo\org\apache\jsp）
You can see from the box that static import is ： The included page will completely contain the code of the included page at compile time . It's important to point out that , Static import also includes the compilation instructions of the included page , If the compilation instructions of two pages conflict , Then the page will go wrong .
2、 What is dynamic import
Dynamic import doesn't import include The compilation instruction of the page is , It's just going to be imported into the page body Insert content into this page .
The syntax format of dynamic import ：
<jsp:include page="{relativeURL|<%=expression%>}" flush="true"/>
perhaps
<jsp:include page="{relativeURL|<%=expression%>}" flush="true">
<jsp:param name="parameterName" value="parameterValue"/>
</jsp:include>
flush Property language specifies whether the output cache is transferred to the imported file . If specified as true, Is included in the imported file , If specified as false, It is included in the original file , about JSP1.1 The old version , Can only be set to false.
For the second grammatical format , Additional request parameters can be added to the imported page .
Dynamic import paradigm ：
We will include1.jsp Code static import changed to dynamic import
<%@ page contentType="text/html; charset=utf-8" language="java" errorPage="" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> static state include Example </title>
</head>
<body>
<!-- Use include Compile the specified import page -->
<jsp：include page="error.jsp" />
</body>
</html>
After compiling, look at the generated servlet Code , You can see the following paragraph ：
The code in the red box shows , Dynamic import just uses a include Method to insert the content of the target page , Instead of completely integrating the target page into this page .
Sum up , There are three differences between static import and dynamic import ：
1、 Static import is to integrate the code of the imported page into , The two pages merge into a whole Servlet; And dynamic import is in Servlet Use in include Method to import the content of the imported page .
2、 During static import, the compilation instructions of the imported page will work ; When importing dynamically, the compiler instructions of the imported page will not work , Just insert the imported page body Content .
3、 Dynamic import can also add additional parameters . That is the following code way ：
<jsp:include page="{relativeURL|<%=expression%>}" flush="true">
<jsp:param name="parameterName" value="parameterValue"/>
</jsp:include>
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