The following article explains When to Use Custom Tags in JSP.

In fact, Custom tags are a way to extend the functionality of JSP (JavaServer Pages) applications by creating custom tags that can be used in JSP pages. Furthermore, Custom tags can simplify the JSP code, improve code readability, and promote code reusability. The following list shows some situations where custom tags can be useful.

  • Repeated functionality. If you find yourself writing the same code over and over again in different JSP pages, you may benefit from creating a custom tag that encapsulates that functionality. For example, if you have several JSP pages that display a list of products, you can create a custom tag that generates the HTML code for the product list and reuse it in all the pages.
  • Domain-specific language. Furthermore, Custom tags can be used to create a domain-specific language (DSL) for your application. This can make the JSP code more expressive and easier to understand for developers who are familiar with the DSL. For example, if you are building an e-commerce application, you can create custom tags for product search, shopping cart management, and order processing.
  • Separation of concerns. Likewise, Custom tags can help to separate the presentation logic from the business logic of the application. This can make the code easier to maintain and modify. For example, you can create custom tags that encapsulate the business logic for retrieving data from a database and generating HTML code for displaying that data.
  • Custom functionality Also. Custom tags can be used to provide custom functionality that is not available in the standard JSP tag library. For example, you can create a custom tag that generates a captcha for user authentication or a custom tag that generates a chart or graph based on data from the application.

Overall, custom tags can be a powerful tool for improving the functionality and maintainability of JSP applications. They allow you to encapsulate functionality, improve code readability, and promote code reuse, while also providing a way to create custom functionality that is not available in the standard JSP tag library.


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