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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The page author can handle an unexpected value more in a user-friendly way, perhaps informing the user of the type of data that is expected or providing a sample of the format of data required by the user. To ensure that the data is displayed to the user correctly we would use: What all of the SQL actions have in common is that they work against a specific data source. The answer is yes. 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.

What it means to use EL in attributes can be shown in the following example: Sue can also be found speaking at various technical conferences around the country.

JavaServer Pages Standard Tag Library

Keep in mind that when using an identifier like book ,for example with the EL, it is the same thing as if you had done PageContext.

Isn’t that business logic that belongs in the model? However, I do consider it an architectural flaw to use them in your application development. Using separate TLDs to expose the tags, the functionality for each set of actions is apparent and makes more. This capability is controlled by the escapeXml attribute. With escapeXml defaulting to true: The overriding theme throughout the JSTL is simplifying the life of the page author.


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. Automatic Type Conversion The automatic type conversion is a very convenient feature of the EL in that a full set of coercion between various object and primitive types is supported.

A more graceful handling of an error is shown in Example 3. If we are dealing with Awhich is an item or object, the coercion rules supplied by the JSTL will be applied for each given type. The following sections are excerpted from various chapters within the JSTL: Struts is an MVC framework that can be learned quickly and will provide a much cleaner architecture than having Model istl located throughout your JSPs.

This is similar to doing a ServletRequest. This allows for the resulting evaluation to be sent to the JspWriter. Iterator actions that make it easy to iterate through collections of Objects.

JavaServer Pages(TM) Standard Tag Library (JSTL) Specification Maintenance Release

The initParam gives access to context initialization parameters, while cookie exposes cookies received in the request. Let’s walk through code samples to see how we use each of the tags provided in this library. While I can barely see the point being made for use of the SQL actions for prototyping or small-scale applications, I can’t ever validate the argument that you just don’t have the time to implement an MVC model correctly.

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. The JSTL defines appropriate conversions and default values. There has always been a need although not a requirement that the page authors have some understanding of a programming language usually Java in order to create complex pages.


The paramValues and headerValues are Maps that map parameter and header names to a String[] of all values for that parameter or header. This holds true for request header information as well as for using the implicit objects header and headerValues. Formatting for numbers, dates, and currency, which includes such actions as:.

This dilemma is what has hampered the true role separation between the JSP page author and the Java programmer. The XML entity values that are used for encoding the characters are shown in Table 4.

Practical Guide for Java Programmers. To sum up for now, the layout of the JSTL is straightforward.

I am not going to go into the various design patterns that can be applied for doing business or integration tier access. It is used to output to the specirication JspWriter. Conditional actions used for doing conditional processing within a JSP.

There are HTML tags included in the string that we want to make sure are rendered correctly with the string bolded.

These general-purpose actions also encompass error handling.