Implementors of JSTL and authors of JSP pages may find the The JavaServer Pages™ Standard Tag Library (JSTL) specification is the result. The JavaServer Pages Standard Tag Library (JSTL) is a component of the Java EE Web application development platform. It extends the JSP specification by. Apache hosts the Apache Standard Taglib, an implementation of the JSP Standard Tag Library (JSTL) specification. Various versions are.
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Objects include pageScope, requestScope, sessionScope, and applicationScope.
While the JSTL is commonly referred to as a single tag library, it is actually composed of four separate tag libraries:. It is used to output to the current JspWriter. Good question and one that I’ve discussed with various members of the JSR expert group. Using the JSTL will not only make your JSPs more readable and maintainable, but will allow you to concentrate on good design and implementation practices in your pages.
Struts is an MVC framework that can be learned quickly and will provide a much cleaner architecture than having Model information located throughout your JSPs.
The identifier itself can reside in any of the known JSP scopes. Using separate TLDs also allows each library to have its own namespace. The JSTL defines appropriate conversions and default values.
We’ll then go through the other configuration settings as well as the available interfaces. Iterator actions that make it easy to iterate through collections of Objects. These general-purpose actions also ustl error handling.
Say we want to personalize our welcome page and pass the name of a user so that we can welcome them. With escapeXml set to false:.
The previous sentence should, at a very minimum, send up a red flag in your architectural visions. Since this expert group has a good cross section of JSP authors and users, the actions provided in the JSTL should suit a wide audience. Perform a multiplication operation to show that the type is correct: These libraries are defined by the Tag Library Descriptor files.
Why then are these actions even provided in the JSTL? However, since these actions are included in the JSTL,I must make sure you understand them and their features so that you can make an informed decision.
JavaServer Pages Standard Tag Library
Then we’ll look at how these pieces can be put to work using the various actions available in the JSTL. In this chapter, we’ll zpecification these internationalization actions.
If that is the one and only reason why you are choosing to use the SQL actions, then I suggest that you investigate using such frameworks as Struts which is part of the Jakarta projects and can be found at http: Let’s examine how the data source is set up and configured.
Using separate TLDs to expose the tags, the functionality for each set of actions is apparent and makes more. Making database queries Soecification query results Performing database modifications Database transactions What all of the SQL actions have in common is that they work against a specific data source. These tag libraries provide a wide range of custom specificaiton functionality that most JSP authors have found themselves in need of in the past.
What it means to use EL in attributes can be shown in the following example:. Formatting for numbers, dates, and currency, which includes such actions as: Again, this mstl as if you had made ServletRequest.
I18N, which refers to the 18 letters between the I and the N in internationalization ,is a common acronym used when talking about internationalization features.
General-purpose actions that are used to manipulate the scoped variables that might be found within a JSP. Locale and resource bundles that include such actions as: Anyone who has worked with JSPs before can certainly appreciate the ease-of-use and coding simplification possible with the EL.
JavaServer Pages(TM) Standard Tag Library (JSTL) Specification Maintenance Release
If we are dealing with Spedificationwhich is an item or object, the coercion rules supplied by the JSTL will be applied for each given type. To ensure that the data is displayed to the user correctly we would use: The value to be written to the JspWriter is specified as a value attribute.
I am not going specigication go into the various design patterns that can be applied for doing business or integration tier access. This capability is controlled by the escapeXml attribute.
If a parameter that represents the month is passed in the request as a Stringthe value of the month variable will be correct because the String will be coerced to the correct type when used. These actions come under the functionality of the I18N umbrella. If you are working with JSP 2. With escapeXml defaulting to true: The set of tags that are available in the Core tag library come into play for probably most anything you will be doing in your JSPs. As touched on briefly in the first chapter, this specificarion one of the most important features of the JSTL and is a prominent feature of the JSP 2.
I hope that you’ve found these brief excerpts to be helpful and applicable to your development. The answer is yes.