Guide JavaServer Pages

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The platform also provides integrated development tools for all development roles, including web developers, Java developers, business analysts, architects, and enterprise programmers. The paper begins by describing the major tools that are available for web developers in Rational Application Developer and then introduces the new features of the latest version. The paper concludes with a list of additional information sources about Java EE web components and Rational Application Developer.

All rights reserved. The full publication includes working examples that show how to develop applications and achieve the benefits of visual and rapid application development. Open Introduction to Java EE web applications Java EE is an application development framework that is the most popular standard for building and deploying web applications in Java. Servlets are Java classes that provide the entry point to logic for handling a web request and return a Java representation of the web response.

After they are compiled and deployed, JSP run as a servlet, where they also take a web request and return a Java object that is representing the response page. Typically, in a large project, the JSP and servlets are part of the presentation layer of the application and include logic to invoke the higher level business methods.

The core business functions are separated into a clearly defined set of interfaces, so that these components can be used and changed independently of the presentation layer or layers, when using more than one interface. The separation of the presentation logic, business logic, and the logic to combine them is referred to as the model view controller MVC pattern and is described later in this paper.

However, the underlying technologies of these tools are extensions to Java servlets and JSP. If you want to iterate the body a few times, your java class tag handler must implement the IterationTag interface. It extends the JSP specification by adding a tag library of JSP tags for common tasks, such as XML data processing, conditional execution, loops and internationalization. The Struts project includes the Struts Tag Library , the bulk of which is useful independently of the Struts architecture.

Internationalization in JSP is accomplished the same way as in a normal Java application, that is by using resource bundles. It is available since JSP 2.

JavaServer Pages (JSP) (1.2 and 2.0)

For instance, it allows developers to create Velocity-style templates:. Then, if an instance of Person was to be placed onto a request attribute under the name "person", the JSP would have:. JSP 2. The main key additions to the Unified EL that came out of the alignment work have been: A pluggable API for resolving variable references into Java objects and for resolving the properties applied to these Java objects, Support for deferred expressions, which may be evaluated by a tag handler when needed, unlike their regular expression counterparts, which get evaluated immediately when a page is executed and rendered, and Support for lvalue expression, which appear on the left hand side of an assignment operation.

When used as an lvalue, an EL expression represents a reference to a data structure, for example: a JavaBeans property, that is assigned some user input.

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A model-view-controller pattern can be used with the JSP files in order to split the presentation from request processing and computer data storage. Either regular servlets or separate JSP files are used to process the request. After the request processing has finished, control is passed to a JSP used only for creating the output. These small extension programs custom tags, servlets, beans, page scripting are variable and likely to be updated or changed either shortly before runtime or intermittently but particularly when sending JSP page requests themselves, it requires the JSP server to have access to a Java compiler SDK or JDK and the required source code not simply the JVM JRE and byte code class files to successfully exploit the method of serving.

Scriptlet tagging called Scriptlet Elements delimited blocks of code with the markup are not effectively markup and allows any java server relevant API e.

4 Developing JavaServer Pages for MapleNet

Scriptlet blocks do not require to be completed in the block itself only the last line of the block itself being completed syntactically correctly as a statement is required, it can be completed in a later block. This system of split inline coding sections is called step over scripting because it can wrap around the static markup by stepping over it. At runtime during a client request the code is compiled and evaluated, but compilation of the code generally only occurs when a change to the code of the file occurs.

JVM operated Tag libraries provide a platform independent way of extending the capabilities of a Web server. Note that not all company makes of Java servers are J2EE specification compliant. From Wikibooks, open books for an open world. DateFormat ; 4 import java. SimpleDateFormat ; 5 import java.

Calendar ; 6 import java. Servlet , javax.

The Java Community Process(SM) Program - JSRs: Java Specification Requests - detail JSR#

HttpServletRequest request , 15 javax. HttpServletResponse response 16 throws javax. ServletException , 17 java. Servlet , 14 javax. HttpServletRequest request , 17 javax. HttpServletResponse response 18 throws javax. ServletException , 19 java.

JSP vs Servlet

HttpServletRequest request , 19 javax. HttpServletResponse response 20 throws javax.

ServletException , 21 java. Namespaces Book Discussion. Views Read Edit View history. Policies and guidelines Contact us. This page was last edited on 14 October , at By using this site, you agree to the Terms of Use and Privacy Policy. Ask to generate the file.

Java Server Pages by Hans Bergsten

Execute the Java class. Specifies the content that is generated.

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This should be used if HTML is not used or if the character set is not the default character set. Indicates the address of the page that should be shown if an exception occurs while processing the HTTP request. To autoflush the contents. A value of true, the default, indicates that the buffer should be flushed when it is full. A value of false, rarely used, indicates that an exception should be thrown when the buffer overflows. To maintain session.

A value of true the default indicates that the predefined variable session of type HttpSession should be bound to the existing session if one exists, otherwise a new session should be created and bound to it. A value of false indicates that no sessions will be used, and attempts to access the variable session will result in errors at the time the JSP page is translated into a servlet. Defines the scripting language used in scriptlets, expressions and declarations.

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  7. Right now, the only possible value is "java". Defines the superclass of the class this JSP will become. Don't use this unless you really know what you're doing — it overrides the class hierarchy provided by the Container. Defines a String that gets put into the translated page, just so that you can get it using the generated servlet's inherited getServletInfo method. Defines the character encoding for the JSP. The default is "ISO" unless the contentType attribute already defines a character encoding, or the page uses XML document syntax.

    The JspWriter used to write the data to the response stream.