JSTL SPECIFICATION PDF
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 previous sentence should, at a very minimum, send up a red flag in your architectural visions. The JSTL defines appropriate conversions and default values. We will talk about this in more detail later in this chapter, but as a quick example, so that you are familiar with the format, the action might look like:. You can reach her at sspielman at switchbacksoftware. Have you heard about the JSTL but aren’t quite sure of how to make the best use of it?
Locale and resource bundles that include such actions as: 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 paramValues and headerValues are Maps that map parameter and header names to a String of all values for that parameter or header. No more creating your own iteration action for the tenth time. It is used to output to the current JspWriter.
The Java Community Process(SM) Program – communityprocess – final
To follow a Model-View. For a complete discussion speciffication Struts along with a sample application, refer to The Struts Framework: The EL operations are necessary to handle data manipulations. The XML entity values that are used for encoding the characters are shown in Table 4.
To follow a Model-View- Controller MVC architecture, which is the predominant design pattern used in building web applications today, you definitely want to keep your model information in your business logic. 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.
Let’s walk through code samples to see how we use each of the tags provided in this library. This is about as easy as it gets to incorporate international support into your application.
An Introduction to JSTL
The param and header objects are Maps that map the parameter or header name to a String. To ensure that the data is displayed to the user correctly we would use:. Since this expert group has a good cross section of JSP authors and users, the actions provided in the Specifiication should suit a wide audience. What it means to use EL in attributes can spceification shown in the following example: For example, a String parameter from a request will be coerced to the appropriate object or primitive.
Isn’t that business logic that belongs in the model? Controller MVC architecture, which is the predominant design pattern used in building web applications today, you definitely want to keep your model information in your business logic.
Each standard action is covered with a detailed explanation and includes a specificatio sample so you can start using the JSTL immediately.
Good question and one that I’ve discussed with various members of the JSR expert group. To sum up for now, the layout of the JSTL is straightforward.
Making database queries Accessing 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.
With escapeXml set to false, our users see the correct display with the text bolded. An exception occured trying to convert String “September”to type “java. You can use expressions in the value attribute. These tag libraries provide a wide range of custom action functionality that most JSP authors have found themselves in need of in the past.
With escapeXml defaulting to true: This capability is controlled by the escapeXml attribute. Let’s look at each functional section in the Core tag library a bit more closely. These libraries are defined by the Tag Library Descriptor files.
The I18N functional area can be broken down into two main areas: 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. Say we want to personalize our welcome page and pass the name of a user so that we can welcome them. specirication