J2EE Explorer: use five easy steps to implement JSP custom tag

The custom tag of JSP provides a standardized mechanism for separating representation from business logic in dynamic Web pages, allowing page designers to focus on representation, application developers write back-end code. In this article by The J2EE explorer, Kyle Gabhart, a developer with a corporate philosophy, describes the basic knowledge of JSP custom tags and guides you through the five steps to add them to the JSP page.
You may have heard that there are hundreds of different methods, but it is important to separate the logic from the business logic when developing a Web application. In recent years, Java platform has developed to add this separation at the level of architecture. For example, add the JavaBean component to the JSP architecture so that developers can use the JSP tag to obtain and set attributes on the specially encoded Java component. These components or JavaBean then execute backend business processing on behalf of the presentation layer.
JSP custom tag is a product of the JSP/JavaBean architecture. Like the JavaBean technology, custom tags help to separate the representation logic from the business logic. In addition, the custom tag serves as a bridge between the HTML, XML, and Javascript worlds of Web designers and the Java code, SQL calls, and algorithm worlds of software engineers.
In this month's J2EE Explorer, you will learn some basic knowledge about using JSP custom tags on JSP pages. We first introduce the JSP tag, and then directly go to the process of creating the tag, combining it with the JSP container, and using it on the JSP page. At the end of this article, we will briefly discuss Java Standard Tag Library (JSTL ), this is a set of standardized JSP custom tags that can be used in your Java development project.
JSP custom tag
A jsp custom tag is a user-defined tag that follows a special XML syntax used by the JSP an Tag (useBean, getProperty, and setProperty. When a servlet container processes a custom tag, one or more Java class files will be called to process it, basically the same as the Java class file to process the JSP Page's JavaBean call. After the tag is processed, the container takes its name and attributes, and marks any content that may exist in the body, and passes it to one or more class files for processing.
Java developers write markup handler classes to process markup and process all required Java code and data operations. For Web designers, user-defined tags and standard HTML tags can use backend dynamic data, but they do not seem to be the same. Correct writing of custom tags allows Web designers to create, query, and operate on data without writing a line of Java code. Correct use of custom tags makes it unnecessary for Java developers to consider the presentation layer during coding. In this way, every member of the application development team can focus on what he or she is best.
Implement JSP custom tag
The JSP architecture requires the following components to implement custom tags: