Jakarta Standard Tag Library API in the Java Class Library (Best Practures of Jakarta Standard Tag Library API in Java Class Library

Jakarta Standard Tag Library (JSTL) is a standard label library provided by Java developers, which is used to simplify the processing process of common tasks in Java Web application development.This article will introduce the best practice of using Jakarta Standard Tag Library API in the Java library and provide related Java code examples. JSTL provides a set of powerful labels to handle common web application tasks, such as output text, circular iteration, conditional judgment and formatting date.The following are the best practices of using JSTL API in the Java library: 1. Use JSTL tags to reduce the dependence of Java code: By using JSTL tags, the page logic can be separated from Java code to improve the readability and maintenance of the code.Use labels in the label library to process common operations, such as cyclic iteration and conditional judgment, which can simplify page logic and reduce dependence on Java code. <c:forEach items="${list}" var="item"> <tr> <td>${item.name}</td> <td>${item.age}</td> </tr> </c:forEach> 2. Try to avoid using Java code logic in JSP: The label library provided by JSTL is very powerful and can perform most common tasks.Try to avoid using the Java code in JSP, but to use the JSTL tag priority.This makes the logic clearer and the code is simpler. <c:choose> <c:when test="${salary > 5000}"> <p>High salary</p> </c:when> <c:otherwise> <p>Low salary</p> </c:otherwise> </c:choose> 3. Use the JSTL function library to perform common operations: JSTL provides a set of powerful function tags, which can perform various commonly used operations in the JSP page, such as string processing, date formatting, and digital operations.These functions can be used to simplify code and improve development efficiency. <%@taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> <c:set var="fullName" value="${fn:concat(firstName, ' ', lastName)}" /> 4. Add JSTL tag library as dependencies to the project: In order to use JSTL in the Java class library, you need to add the JSTL label library as the project as a project to the construction file (such as Maven or Gradle).This can ensure that the project contains the related classes and resource files of JSTL. Maven dependence configuration example: <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> Gradle dependency configuration example: groovy dependencies { implementation 'javax.servlet:jstl:1.2' } 5. Avoid excessive use of the JSTL label library: Although JSTL provides a lot of powerful labels, it should be cautious when using.Excessive use of the label library may cause the page code to be too complicated and difficult to maintain.Make sure you only use labels that meet the needs of the project, and pay attention to avoid repeated labels. By following the above best practice, you can better use the Jakarta Standard Tag Library API in the Java class library.Using the JSTL tag can make the code clearer, concise, and speed up the development speed.At the same time, understanding the functions and uses of JSTL can help developers better use the label library to handle common web application tasks.