Java Server Pages Quiz
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Questions and Answers

What method is used to retrieve the input string in a JSP page?

  • retrieveData()
  • getInput()
  • getRequest()
  • getParameter() (correct)

Which of the following is NOT a role of directives in JSP?

  • Define variables and methods (correct)
  • Specify the content type and character encoding
  • Provide general information to the JSP engine
  • Import classes and packages

As of JSP 1.2, which scripting language is allowed for use in JSP pages?

  • Java (correct)
  • Ruby
  • Python
  • JavaScript

What is one purpose of the directive that specifies whether the JSP page takes part in an HTTP session?

<p>To manage session data (C)</p> Signup and view all the answers

What will be displayed if the current date is instantiated in a JSP page?

<p>The string representation of the date (B)</p> Signup and view all the answers

Which directive allows the inclusion of another file's contents in a JSP page?

<p>&lt;%@ include %&gt; (C)</p> Signup and view all the answers

Which scripting element is used to write Java code within a JSP page?

<p>Scriptlet (C)</p> Signup and view all the answers

What does the expression scripting element in JSP do?

<p>Outputs a string to the response (C)</p> Signup and view all the answers

What allows developers to generate both static and dynamic HTTP content in web development?

<p>Java Server Pages (JSP) (D)</p> Signup and view all the answers

Which aspect of JSP simplifies web application development?

<p>Using JavaBeans and custom tags (C)</p> Signup and view all the answers

What is a primary benefit of using JSP compared to Servlets?

<p>JSP offers automatic recompilation upon changes. (C)</p> Signup and view all the answers

How does JSP encourage team collaboration in web development?

<p>By allowing separate teams for HTML layout and Java programming. (C)</p> Signup and view all the answers

Which statement explains the key difference between JSP and Servlets?

<p>JSP requires less code for generating HTML. (B)</p> Signup and view all the answers

What is one of the key features of Java Server Pages?

<p>It combines HTML with server-side Java code. (A)</p> Signup and view all the answers

What does the JSP life cycle primarily involve?

<p>Phases such as translation, compilation, and initialization. (D)</p> Signup and view all the answers

In JSP, how does separation of content and display logic benefit developers?

<p>It allows for better maintainability and organization of code. (D)</p> Signup and view all the answers

What method is called when the start-tag of the Welcome custom tag is encountered?

<p>doStartTag() (B)</p> Signup and view all the answers

What is the purpose of the prefix attribute in the taglib directive used in a JSP?

<p>To define a default namespace (A)</p> Signup and view all the answers

What is the correct return type of the doStartTag() method in a custom tag implementation?

<p>int (D)</p> Signup and view all the answers

Which expression is used in JSP 2.0 to access application data easily?

<p>Expression Language (EL) (A)</p> Signup and view all the answers

In which file is the welcome tag defined and mapped to the handler class?

<p>myLib.tld (C)</p> Signup and view all the answers

What is the shorthand notation for accessing data using Expression Language (EL)?

<p>${data} (D)</p> Signup and view all the answers

What exception is thrown in the doStartTag() method if an error occurs?

<p>JspException (C)</p> Signup and view all the answers

Which class component is commonly accessed through Expression Language (EL) in JSP?

<p>JavaBean (A)</p> Signup and view all the answers

What does the action attribute of the HTML form specify in the JSP example?

<p>The URL where the form data will be submitted. (D)</p> Signup and view all the answers

Which directive is used in JSP to import all classes from the java.util package?

<p>&lt;%@ page import='java.util.*' %&gt; (B)</p> Signup and view all the answers

What is the purpose of the declaration element in JSP?

<p>To insert Java code outside of any methods. (D)</p> Signup and view all the answers

What is the main difference between JSP comments and regular HTML comments?

<p>JSP comments remain on the server, while HTML comments are sent back to the client. (C)</p> Signup and view all the answers

Which JSP element is used to display the result of an expression in string format?

<p>Expression element (B)</p> Signup and view all the answers

What advantage does jsp:setProperty have over setXXX() methods?

<p>It can automatically convert string data types to required types. (B)</p> Signup and view all the answers

Where can a JSP file be placed?

<p>Anywhere an HTML file can be placed. (D)</p> Signup and view all the answers

What does the jsp:getProperty action element do?

<p>It retrieves a bean's value and converts it to a string. (A)</p> Signup and view all the answers

What is the role of the submit button in the JSP example?

<p>To send the data to the specified URL. (C)</p> Signup and view all the answers

Which JavaBean method is used to set the userName property?

<p>public void setUserName(String name) (D)</p> Signup and view all the answers

What happens when a user submits the form with a username in the JSP example?

<p>A new dynamic page is generated to welcome the user. (D)</p> Signup and view all the answers

What is the primary function of the jsp:plugin action?

<p>To insert client-side Java applets into a JSP page. (C)</p> Signup and view all the answers

What must be done to use jsp:getProperty in a JSP page?

<p>Reference a bean defined using jsp:useBean. (B)</p> Signup and view all the answers

How does the NameBean class initialize the userName property?

<p>It initializes userName to null in the constructor. (B)</p> Signup and view all the answers

What is the expected output when response.jsp retrieves the userName property?

<p>&quot;Hello, &quot; followed by the user's name. (A)</p> Signup and view all the answers

What does the syntax of the jsp:plugin action include?

<p>Inserting Java applets or similar client-side components. (A)</p> Signup and view all the answers

What is the main focus of Java Server Pages (JSP)?

<p>Data presentation (B)</p> Signup and view all the answers

Which of the following describes the role of the JSP engine?

<p>It converts JSP pages into Java Servlets. (D)</p> Signup and view all the answers

What happens when a JSP page is requested for the first time?

<p>The JSP engine parses and translates it into a Servlet. (D)</p> Signup and view all the answers

Which feature introduced in JSP 2.0 simplifies web page authoring?

<p>Expression Language (EL) (C)</p> Signup and view all the answers

How does the JSP life cycle relate to Servlet technology?

<p>JSP life cycle is determined by Servlet technology. (D)</p> Signup and view all the answers

What occurs if the JSP page has not been accessed before or has been modified?

<p>The JSP engine translates the document into a Servlet. (C)</p> Signup and view all the answers

Which web server implementation is a common example of a JSP engine?

<p>Tomcat (C)</p> Signup and view all the answers

What is one characteristic of custom tags in JSP?

<p>They enhance the extensibility of JSP. (B)</p> Signup and view all the answers

Flashcards

JSP

A Java technology used to create dynamic web pages by embedding Java code within HTML. Think of it as a mixture of HTML & Java.

JSP Life Cycle

The sequence of events that occur when a JSP page is requested and processed by the server. It involves parsing, compiling, and executing the JSP code.

What is the purpose of JSP?

JSP provides a way to generate both static and dynamic HTML content for web applications. It allows you to work with server-side data and logic while also having a more structured way to write HTML compared to Servlets.

JSP Scripting Elements

These are special tags used within JSP pages to embed Java code. They allow you to interact with Java objects, perform calculations, and more.

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JSP Standard Actions

Built-in tags that perform common tasks such as including other JSP pages, accessing JavaBeans, and setting attributes. They simplify common operations without requiring extensive custom code.

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Custom Tags Library

A collection of reusable JSP tags that you create to encapsulate complex logic and provide a clean interface for developers. Think of them as custom building blocks.

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Expression Language (EL)

A language used within JSP pages to access and manipulate data from JavaBeans and other sources. It allows you to display and manipulate values without writing Java code.

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Why use JSP over Servlets?

JSP makes it easier to write HTML, separate presentation from logic, and use standard HTML tools. While Servlets are powerful, JSP simplifies the process of generating web pages by integrating HTML more seamlessly.

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What is JSP?

JSP is a server-side programming technology that uses Java code to create dynamic web content. It's built upon the Servlet API and allows developers to embed Java code within HTML to generate interactive content.

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JSP and Servlets: Relationship

JSP files are essentially translated into Servlets by a JSP engine. Therefore, JSP's life cycle is determined by Servlet technology, meaning JSPs depend on a Servlet container to function.

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JSP Engine's Role

The JSP engine takes JSP pages and converts them into Servlet Java code, which is then compiled into a class file. This class file is executed by the Servlet container to generate the final web content.

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JSP's Purpose in Web Development

JSP focuses primarily on data presentation, meaning it controls how information is displayed to the user. It relies on other web components like Servlets, JavaBeans, and custom tags to handle the logic behind the data.

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What is JSP's life cycle?

When a request is made to a JSP page, the JSP engine checks if it's a new page or has changed since the last access. If so, it parses the JSP into a Servlet Java file, compiles it into a class file, and then the Servlet container executes the class file to generate the response. This process is repeated for each new request.

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Why is the Servlet container needed for JSP?

The JSP engine generates Servlet Java code, which needs a Servlet container to run and execute. The container provides the necessary environment for the Servlet to process requests and generate the web content.

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How is JSP extensible?

JSP 2.0 introduced Expression Language (EL) which simplifies web page authoring. Developers can also create custom tags to extend the JSP library and reuse them across different projects.

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JSP Data Access

JSP provides a consistent way to access data sources such as implicit server objects, JavaBeans, Servlets, and even remote data. This makes it easier to integrate different types of data into web pages.

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JSP Directive Element

A tag that instructs the JSP engine on page structure. It doesn't generate servlet code directly, like Java's import directive.

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JSP Declaration Element

A tag that inserts Java code into the generated servlet source code outside of any method.

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JSP Expression Element

A tag that displays the value of an enclosed expression as a string.

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JSP Comment Scripting Element

A tag that includes comments only on the server side, not visible to the client.

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JSP Regular HTML Comment

A standard HTML comment visible to both the server and client.

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JSP Page Structure Directive (<%@ page %>)

A directive that sets the page's content type and imports necessary classes.

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JSP File Placement

JSP files can be placed anywhere an HTML file can be placed within a web application.

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What is the purpose of the getParameter() method in JSP?

The getParameter() method in JSP is used to retrieve values from incoming HTTP requests. These values can come either from the input text fields of a form or from the URL query string.

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What is a JSP scriptlet?

A JSP scriptlet is a block of Java code embedded within a JSP page. It uses '<% %>' tags and is essentially Java code that gets inserted directly into the service() method of the generated servlet.

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What is the purpose of JSP directives?

JSP directives provide instructions to the JSP engine about how to process the page. They help configure the JSP page and provide metadata.

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What does the 'page' directive do?

The 'page' directive sets attributes like scripting language, error handling, and session management. It controls how the JSP page interacts with the server.

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What is the 'include' directive used for?

The 'include' directive incorporates the contents of another file (HTML, JSP, etc.) into the current JSP page. The included file can be a static file or a dynamic JSP page.

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What is a JSP declaration?

A JSP declaration defines variables and methods that can be used within the JSP page. These declarations act like Java code that's accessible throughout the page.

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What are the main JSP scripting elements?

JSP scripting elements are special tags used to embed Java code within a JSP page. They allow you to interact with objects, perform calculations, and more.

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Why is JSP important for web development?

JSP provides a powerful way to combine server-side logic with HTML to create dynamic web pages. It allows you to respond to user interactions, query databases, and create engaging user experiences.

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jsp:setProperty Action

A JSP action that automatically converts String data to the required data type of a bean property. It also allows setting multiple properties using a single command.

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jsp:getProperty Action

This action retrieves a bean property value, converts it to a string, and inserts it into JSP output. It requires the bean's ID and the property name.

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Why use jsp:setProperty over setXXX() methods?

jsp:setProperty is more powerful because it handles data type conversion, allowing you to set bean properties without explicit type conversions.

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How does jsp:plugin Action work?

This action inserts a Java Applet (client-side) into a JSP (server-side) page. It downloads necessary Java plug-in software and executes the Applet.

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What is the purpose of jsp:plugin Action?

The jsp:plugin action allows you to display Applet or bean objects in a web browser, using a Java plug-in.

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How is jsp:plugin Action replaced in client HTML?

The jsp:plugin action is replaced with an <OBJECT> element in HTML.

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What is the role of NameBean in the example?

NameBean is a JavaBean that stores the user's name. It provides methods to set and retrieve the username value.

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How does the example demonstrate using jsp:getProperty?

The response.jsp file uses jsp:getProperty to fetch the username from the NameBean and display a greeting message.

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WelcomeTag.doStartTag()

This method is called by the JSP container when the start tag of the custom tag is encountered. It handles the processing and output of the tag's content.

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JSP Tag Handler Class

A Java class that implements the logic and behaviour of a custom JSP tag. It is responsible for processing the tag's content and generating the output.

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JSP Tag Library Descriptor (TLD)

An XML file that defines custom tags and maps them to their corresponding tag handler classes. It acts as a blueprint for the tag library.

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JSP Tag Prefix

A namespace assigned to a tag library, used to differentiate custom tags from standard JSP tags. It's specified in the taglib directive within the JSP page.

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JSP Implicit Object: pageContext

An object representing the entire JSP page's execution context. It provides access to other implicit objects, page attributes, and configuration settings.

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JspWriter Object

A JSP implicit object that allows you to write output directly to the browser, creating the dynamic content of the page.

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JSP Expression Language (EL)

A simplified language for accessing and manipulating data within JSP pages, used for efficient presentation logic.

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JSP Tag Library Directive

A directive used within JSP pages to include custom tag libraries, specifying the TLD file location and the prefix for the tag namespace.

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Study Notes

CSBP 461: Internet Computing: Java Server Pages (JSP)

  • Course covers Java Server Pages (JSP) technology
  • Objectives include introduction to JSP Web components, comparison with Servlets, presentation of the JSP life cycle, introduction to JSP scripting elements, discussion of JSP standard actions, and custom tags library, and introduction to the expression language.
  • JSP technology allows creation of static and dynamic web pages.
  • JSP pages are similar to regular HTML pages but contain embedded Java code for generating dynamic content.
  • Simplest JSP page is an HTML page with a .jsp extension.
  • A simple JSP page can display dynamic content such as the current time.
  • Servlets are more complex than JSPs to author and use println statements to generate HTML pages
  • JSP is easier to write and maintain HTML.
  • JSP Benefits include separation of content and display logic, simplifies web application development, supports software reuse, automatic deployment, easier web page authoring, and platform independence.
  • JSP can technically do everything servlets can do.
  • JSP makes it easier to author HTML and maintain it.
  • JSP allows use of standard HTML tools like DreamWeaver.
  • JSP separates Java code that creates content from the HTML code that presents it.
  • Most JSP pages embed Java code that is used to process server-side data and implement business logic, and JSP relies on Servlet container support to function.
  • JSP engine translates the page into Java Servlet code and compiles into Servlet classes.
  • JSP focuses on presenting data while other components focus on business logic processing.
  • JSP 2.0 features include Expression Language (EL) for more consistent and easier Web development, and tag library extensibility.
  • Many real-world websites (e.g., Travelocity, Walmart, Ask.com) use JSP/Servlet technology.
  • The JSP life cycle involves parsing, compiling, loading, and execution of JSP code into a Servlet class by the web server in response to client requests

JSP Life Cycle

  • JSP engine translates JSP page into a Java Servlet at runtime.
  • The JSP life cycle is determined by Servlet technology.
  • The JSP engine is a JSP specification implementation that comes with web servers implementing JSP (e.g. Tomcat).
  • Client browser request to JSP page can come from another web component.
  • Web server checks if the JSP page has been modified since its last access; if so, it regenerates the Servlet.
  • The server translates the JSP page to a Java Servlet code, compiles the Servlet code to a class file, loads the Servlet class for execution, and returns the result.

JSP Syntax Elements

  • Directives: control how JSP is translated.
  • Declarations: declare variables and methods.
  • Scriptlets: short blocks of Java code for program instructions.
  • Expressions: evaluate expressions for display in the page
  • Comments: used for documentation

JSP Standard Actions

  • jsp:forward: redirects a request to another page (internal redirect).
  • jsp:include: inserts the content of another file into the JSP page dynamically (run-time inclusion).

JSP JavaBean Components

  • JavaBeans: reusable components for encapsulating business logic.
  • jsp:useBean: creates or retrieves a reference to a JavaBean.
  • jsp:setProperty: sets properties of a bean.
  • jsp:getProperty: retrieves a property of a bean.

JSP 2.0 Expression Language (EL)

  • Expression Language (EL): simplifies accessing data in JSP pages (shorthand notation).
  • Accesses data from within the pageContext, request, session, and application.

Implicit Variables

  • application: represents the application's context.
  • config: used for getting JSP initialization parameters.
  • page: used for getting JSP initialization parameters.
  • session: represents the user's session.
  • request: represents the current request.

Custom Tag Library

  • Custom tags enhance code reusability by encapsulating Java code within a tag interface.
  • Includes a tag library descriptor in XML format, a tag handler class file, and custom tags in JSP files.

jsp:plugin Action

  • Used to include Java applets within a JSP page, handling client-side components.

JSP Implicit Variables (continued)

  • Implicit variables are automatically generated by the JSP engine.

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Test your knowledge about Java Server Pages (JSP) with this comprehensive quiz. This quiz covers various aspects of JSP, including its directives, scripting elements, and advantages over Servlets. Perfect for students and developers looking to solidify their understanding of JSP.

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