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?

To manage session data Signup and view all the answers

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

The string representation of the date Signup and view all the answers

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

<%@ include %> Signup and view all the answers

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

Scriptlet Signup and view all the answers

What does the expression scripting element in JSP do?

Outputs a string to the response Signup and view all the answers

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

Java Server Pages (JSP) Signup and view all the answers

Which aspect of JSP simplifies web application development?

Using JavaBeans and custom tags Signup and view all the answers

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

JSP offers automatic recompilation upon changes. Signup and view all the answers

How does JSP encourage team collaboration in web development?

By allowing separate teams for HTML layout and Java programming. Signup and view all the answers

Which statement explains the key difference between JSP and Servlets?

JSP requires less code for generating HTML. Signup and view all the answers

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

It combines HTML with server-side Java code. Signup and view all the answers

What does the JSP life cycle primarily involve?

Phases such as translation, compilation, and initialization. Signup and view all the answers

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

It allows for better maintainability and organization of code. Signup and view all the answers

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

doStartTag() Signup and view all the answers

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

To define a default namespace Signup and view all the answers

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

int Signup and view all the answers

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

Expression Language (EL) Signup and view all the answers

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

myLib.tld Signup and view all the answers

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

${data} Signup and view all the answers

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

JspException Signup and view all the answers

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

JavaBean Signup and view all the answers

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

The URL where the form data will be submitted. Signup and view all the answers

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

<%@ page import='java.util.*' %> Signup and view all the answers

What is the purpose of the declaration element in JSP?

To insert Java code outside of any methods. Signup and view all the answers

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

JSP comments remain on the server, while HTML comments are sent back to the client. Signup and view all the answers

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

Expression element Signup and view all the answers

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

It can automatically convert string data types to required types. Signup and view all the answers

Where can a JSP file be placed?

Anywhere an HTML file can be placed. Signup and view all the answers

What does the jsp:getProperty action element do?

It retrieves a bean's value and converts it to a string. Signup and view all the answers

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

To send the data to the specified URL. Signup and view all the answers

Which JavaBean method is used to set the userName property?

public void setUserName(String name) Signup and view all the answers

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

A new dynamic page is generated to welcome the user. Signup and view all the answers

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

To insert client-side Java applets into a JSP page. Signup and view all the answers

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

Reference a bean defined using jsp:useBean. Signup and view all the answers

How does the NameBean class initialize the userName property?

It initializes userName to null in the constructor. Signup and view all the answers

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

"Hello, " followed by the user's name. Signup and view all the answers

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

Inserting Java applets or similar client-side components. Signup and view all the answers

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

Data presentation Signup and view all the answers

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

It converts JSP pages into Java Servlets. Signup and view all the answers

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

The JSP engine parses and translates it into a Servlet. Signup and view all the answers

Which feature introduced in JSP 2.0 simplifies web page authoring?

Expression Language (EL) Signup and view all the answers

How does the JSP life cycle relate to Servlet technology?

JSP life cycle is determined by Servlet technology. Signup and view all the answers

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

The JSP engine translates the document into a Servlet. Signup and view all the answers

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

Tomcat Signup and view all the answers

What is one characteristic of custom tags in JSP?

They enhance the extensibility of JSP. Signup and view all the answers

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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Description

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.