Lecture 2A

Question 1

What are scoped variables?

Answer 1

For storing and sharing data in server memory. Across an entire session instead of surrounding method (doPost() doGet()). Data objects put in scope (a map) in main memory.

Question 2

How long does session last?

Answer 2

Until user closes browser or server is stopped.

Question 3

What are the two main methods to create and access scoped variables?

Answer 3

Scope.setAttribute() and scope.getAttribute()

Question 4

Code for using sessions scoped variable:

Answer 4

Request.getSession().setAttribute(name, value);

Question 5

JSP? JSF?

Answer 5

Java Server Pages, Java Server Faces. JSPs are translated into servlets at runtime. Like HTML pages which contain Java Code - scriptlets,

Question 6

How to write scriptlets:

Question 7

Pros of using JSP’s

Answer 7

Content and display logic seperate, automatic deployment (recompile automatically), uses javabeans, easy to do html, platform independent.

Question 8

JSP expressions:

Answer 8

Also: Expression

Question 9

JSP scriptlets:

Answer 9

Also: code

Question 10

JSP declaration:

Question 11

JSP actions:

Question 12

Write basic import statement for servlet extras

Answer 12

Import javax.servlet.http.HttpServlet;