SpringSource Javax Servlet JSP JSTL framework version update and new feature introduction
SpringSource Javax Servlet JSP JSTL framework version update and new feature introduction
【introduction】
SpringSource uses Javax Service, JSP, and JSTL frameworks when developing an enterprise Java Web application.The continuous update and improvement of these frameworks are very important for developers because they add new functions and repair problems in the old versions.This article will introduce the version update and new features of SpringSource Javax Servlet, JSP and JSTL frameworks to help developers understand their evolution and use methods.
[Javax Servlet Framework]
The Javax Servlet framework is used to develop standard APIs based on Java -based web applications.It process HTTP requests and responses by defining a set of interfaces and classes.Here are the functions and improvements of some newer versions of the Javax Service framework:
1. Servlet 3.0: Servlet 3.0 has introduced the ability of asynchronous request processing, annotation support and dynamic registered service.Asynchronous request processing allows processing for long -term operation without blocking server threads.Note support enables developers to configure the service using the annotation instead of the traditional web.xml file.The ability to dynamically register the service allows registering and canceling the SERVLET when the application is running.
2. Servlet 4.0: Servlet 4.0 version adds support for the HTTP/2 protocol, providing more efficient connection management and resource reuse.It also introduces the HTTP/2 server push function, allowing the server to actively push related resources to the client to improve performance.
【JSP framework】
JSP (Javaserver Pages) is a Java technology used to dynamically generate HTML, XML or other types of documents.It allows to embed Java code in the page so that developers can separate business logic from page display.The following is the version update and new feature of the JSP framework:
1. JSP 2.0: JSP 2.0 introduces expression language (EL) and tag files.Expression language allows developers to use scripts or expressions instead of Java code on the JSP page.Label files can help developers reuse page fragments and provide clearer page structures.
2. JSP 2.1: JSP 2.1 adds support for annotations and static containing support on the basis of JSP 2.0.The annotation enables developers to use annotations on the JSP page to configure the page behavior.Static includes allowing one JSP page to nested in another JSP page to achieve page reuse.
【JSTL framework】
JSTL (JSP Standard Tag Library) is a label -based framework to simplify the Java code written in JSP.It provides a set of labels and functions that can be used to handle common tasks, such as iterative collection, formatting date and processing condition statement.The following is the version update and new feature of the JSTL framework:
1. JSTL 1.1: JSTL 1.1 introduced the Core label library for processing conditions and circulators.It also provides a formatting label library that can be used for formatting dates, numbers and messages.
2. JSTL 1.2: JSTL 1.2 introduced the XML tag library for processing XML data.It also adds the SQL tag library for SQL query in JSP.
【Example code】
Below is an example code using JSP and JSTL for page rendering:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<Title> Example Page </Title>
</head>
<body>
<H1> Welcome to Jstl </h1>
<c:forEach var="item" items="${items}">
<p>${item}</p>
</c:forEach>
</body>
</html>
In the above examples, we use JSTL's Core tag library to traverse the collection named "Items" and display each element on the page.
【in conclusion】
This article introduces the version update and new features of SpringSource Javax Servlet, JSP and JSTL frameworks.By understanding the evolution and functional improvement of these frameworks, developers can better use them to develop efficient Java Web applications.I hope this article can help you, thank you for reading!
