EL, JSTL, ELJSTL

EL, JSTL, ELJSTL

1. EL

As long as the web server supports Servlet2.4/JSP2.0, you can directly use EL expressions on the JSP page. However, to be compatible with previous versions, EL expressions are not allowed. EL scope and its disabling methods are as follows:

 

The basic syntax of EL is $ {expression}

2. JSTL

JSTL must be configured during use, and JSTL-related packages: jstl. jar and standard. jar must be downloaded.

The five tag libraries provided by JSTL are as follows:

You can use an online uri when introducing the core tag library in the JSP page, for example: <% @ taglib prefix = "c" uri = "http://java.sun.com/jsp/core" %>