JSP Elements & Directives

Question 1

scriptlet

Answer 1

• scriptlet tag allows to write Java code into JSP
• it can contain any number of Java statements, variable or method declarations, or expressions that are valid in the page scripting language

Question 2

JSP declaration tag

Answer 2

< %! Inside this tag we can initialize our variables, methods, and classes % >

open angled bracket percent exclamation mart + codes + percent closed angled bracket

• it is for declaring variables, methods and classes

Question 3

syntax of Scriptlet tag

Answer 3

< % java code % >

- it allows to write/insert Java code into JSP file

Question 4

syntax of JSP expression

Answer 4

< %= expression % >

• it evaluates the expression placed in it
• it allows creating expressions like arithmetic and logical

Question 5

syntax of JSP comments

Answer 5

< % – JSP comments – % >

- is used to comment in JSP and ignored by the JSP container

Question 6

What are the 3 scripting elements in JSP?

Answer 6

• scripting tag
• expression tag
• declaration tag

Question 7

JSP Directives

Answer 7

< %@ directive attribute=”value” % >

• directions and instructions to the container, telling it how to handle certain aspects of the JSP processing
• a JSP directive affects the overall structure of the servlet class

Question 8

3 types of JSP directives

Answer 8

• Page directive
• Include directive
• Taglib directive

Question 9

Page directive

Answer 9

< % @page .. % >

• it provides attributes that get applied to the entire JSP page
• by convention, it is coded at the top of the JSP page

Question 10

import attribute

Answer 10

• the most used attribute in page directive

- similar to the import statement, it tells the container to import other java classes, interfaces, enums, etc.

Question 11

Include directive

Answer 11

< % include file = “filename” % >

• it is used to include a file during the translation phase
• it tells the container to merge the content of other external files with the current JSP
• you may code the include directives anywhere on your JSP page
• very useful in creating templates with the user views and breaking the pages into header & footer and sidebar actions