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Important Web Design and Development Short Questions

Chapter: 34
Question 1:
What are the different types of JSP comments?
Answer: There are HTML comments, which are visible in the browser's source view (e.g., <!-- comment text -->), and JSP comments, which are not visible in the browser (e.g., <%-- comment text --%>).
Chapter: 34
Question 2:
How are JSP expressions formatted and used?
Answer: JSP expressions are written as <%= Java expression %>. These expressions are evaluated and converted to strings, then placed into the HTML page at the location they appear. For example, <%= new java.util.Date() %> displays the current date.
Chapter: 34
Question 3:
What is the purpose of JSP scriptlets?
Answer: JSP scriptlets, written as <% Java code %>, allow embedding Java code directly into the JSP page. This code is inserted verbatim into the servlet's service method and is used for tasks like processing user input.
Chapter: 34
Question 4:
Explain how JSP declarations are used.
Answer: JSP declarations, written as <%! Java code %>, are used to declare variables and methods at the class level in the servlet. This code is included in the servlet's class definition and can be used throughout the JSP.
Chapter: 34
Question 5:
How can you write JSP scripting elements in XML style?
Answer: In XML style, JSP scripting elements are written using tags such as <jsp:declaration>, <jsp:expression>, and <jsp:scriptlet>. Each opening tag must have a corresponding closing tag. For example, <jsp:expression> res </jsp:expression> displays the value of res.
Chapter: 35
Question 6:
What are implicit objects in JSP?
Answer: Implicit objects are automatically defined variables in JSP that simplify coding. Key implicit objects include request, response, and out, among others. They provide access to request parameters, response settings, and output streams respectively.
Chapter: 35
Question 7:
What is the role of the request implicit object in JSP?
Answer: The request implicit object is of type HttpServletRequest. It provides access to request parameters, request types (e.g., GET or POST), and HTTP request headers such as cookies.
Chapter: 35
Question 8:
How does the response implicit object function in JSP?
Answer: The response implicit object, of type HttpServletResponse, is used to set HTTP status codes, content types, and response headers. It controls the data sent back to the client.
Chapter: 35
Question 9:
Describe the use of the out implicit object in JSP.
Answer: The out implicit object is an instance of JspWriter used for sending output to the client's browser. It allows for dynamic content generation and rendering of HTML.
Chapter: 35
Question 10:
How does the session implicit object differ from application in JSP?
Answer: The session implicit object (of type HttpSession) is used for working with user-specific session data, while the application implicit object (of type ServletContext) is used for storing and sharing data across the entire web application.