The introduction of jstl (j**aserver pages standard tag library) mainly includes the following steps:
JSP page ingestion: At the beginning of the JSP page, you need to use the <%@taglib%> directive to import the JSTL tag library. For example, to introduce the JSTL core tag library, you can add the following **::
taglib uri="" prefix="c" %>
Here the URI attribute specifies the URI of the tag library, and the prefix attribute defines a prefix for the tag library to be used in JSP pages.
JSTL JAR package import: You need to add the JSTL JART package to the classpath of the project. Typically, this means copying the jar file to the project's lib directory. The jar package can be downloaded from the official ***jstl.
Make sure version compatibility: If you're using jstl 1version 1, you need to be careful not to report an error when it is introduced, because 1Version 1 of the jar package includes 10 and 1Version 1 of the TLD file. This means that even if you use the ingestion method of the old version on the page, there will be no problems.
Use tag library: After the tag library is introduced, you can use the tags provided by JSTL on the JSP page to complete various functions, such as iteration, condition judgment, XML document operation, etc.
Formatting and SQL tags: In addition to core tags, JSTL also provides formatting tags (for formatting dates, times, numbers) and SQL tags (for executing SQL queries and updates), which need to be introduced in a similar way.
XML tags: For working with XML documents, JSTL provides a dedicated XML tag library, which also needs to be imported via <%@taglib%> directives.
Internationalization tags: If internationalization is required, JSTL also provides a corresponding tag library to support the display of multilingual content.
In general, through the above steps, the JSTL tag library can be successfully introduced and used in the JSP project, so as to improve the development efficiency and maintainability.