Jakarta Standard Tag Library API Reference Manual
Jakarta Standard Tag Library API Reference Manual
Jakarta Standard Tag Library (JSTL) is a group of Java tag libraries that provides a simplified and accelerated JSP page development method for Java developers.The API provides a series of reusable labels to handle common web development tasks, such as iterative collection, formatting date and numbers, processing forms, and conducting conditional judgment.This article will introduce the reference manual of the JSTL API and provide some Java code examples to help you better understand and use the API.
The reference manual will provide the following:
1. Overview of JSTL API: Introduce the main functions and uses of JSTL API, and how to integrate into the Java Web application.
2. Tag library: Introduce the label library provided by JSTL, including the core label library (Core), the formatting label library (FMT), the XML tag library (XML), and the SQL tag library (SQL).Each label library has its specific purpose and function.
3. Label reference: introduce the usage and functions of each label and its attributes one by one.Taking the core label library as an example, it may include <c: Foreach> for iterative sets, <c: if> and <c: choose> for conditional judgments, <C: set> for setting variable values, etc.
4. Function example: Provide some practical examples to show how to use JSTL for common web development tasks.Examples may include querying data from the database and displaying results on the JSP page, and dynamically generate the element of table unit according to the conditions.
Below is an example code using JSTL:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<html>
<head>
<title>JSTL Example</title>
</head>
<body>
<h1>List of Users</h1>
<c:forEach items="${users}" var="user">
<p>${user.name}</p>
</c:forEach>
<fmt:formatDate value="${now}" type="date" pattern="yyyy-MM-dd" />
</body>
</html>
In the above examples, we iterate a collection of "USERS" through the <C: Foreach> tag, and shows the user's name in each iteration.In addition, the <fMT: Formatdate> tag is used to format the current time format into a specified date format.
I hope this article can help you understand and use Jakarta Standard Tag Library API.By reading the reference manual and actual examples, you can better master the functions and usage of the JSTL API, thereby simplifying and accelerating the development process of the JSP page.I wish you a happy use!
