Three methods for introducing one jsp page and three methods for introducing static and dynamic jsp pages

Three methods for introducing one jsp page and three methods for introducing static and dynamic jsp pages

1. First: jstl import

<C: import url = "inlayingJsp. jsp"> </c: import>

2. Type 2: jsp include command

The include command tells the container to copy all the content summarized by the included file and paste it into the file.

<% @ Include file = "inlayingJsp. jsp" %>

3. Third: jsp include action

<Jsp: include page = "inlayingJsp. jsp" flush = "true"/>

Note: (1) the include command inserts the source code of "Header. jsp" during conversion, while the <jsp: include> action inserts the response of "Header. jsp" at runtime.

<% @ Include is static. <% @ include, regardless of the txt text or jsp file, the contained pages are not re-compiled.

<% @ Include is a static inclusion. When several JSP files are translated into servlet, several class files are generated, if the variable I is defined in jsp1 and the variable I is also defined in jsp2, compilation will fail,

The jsp Container will tell you that I has already defined it.

<Jsp: include is dynamic inclusion. <jsp: include includes jsp files. This means that the included pages must be re-compiled every time the home page is loaded.

That is to say, no matter how many jsp pages you contain are translated into servlet, there is a class file.

Therefore, use the <% @ include option with caution!

(2) when using the jstl label, be sure to add the following code in the jsp file header: <% @ taglib prefix = "c" uri = "https://Java.sun.com/jsp/jstl/core" %>