The document summarizes various JSTL core tags used for conditional and iterative operations in JSP pages. The <c:if> tag displays content if a condition is true. The <c:choose>, <c:when>, <c:otherwise> tags function like a switch statement, with <c:when> displaying content if its condition is true and <c:otherwise> displaying otherwise. The <c:forEach> tag iterates over a collection, while <c:forTokens> iterates over tokens separated by a delimiter in a string. The <c:param> tag adds parameters to a URL, and <c:redirect> redirects the browser to a new URL, supporting parameters. The <c:url>

1. SESSION – 10
By→ Anuj Kumar Singh

2. JSTL Core <c:if> Tag
1. The < c:if > tag is used for testing the condition and it display the body
content, if the expression evaluated is true.
2. It is a simple conditional tag which is used for evaluating the body
content, if the supplied condition is true.

3. Example
a. newjsp.jsp
Output

4. JSTL Core <c:choose>, <c:when>, <c:otherwise> Tag
1. The < c:choose > tag is a conditional tag that establish a context for
mutually exclusive conditional operations. It works like a
Java switch statement in which we choose between a numbers of
alternatives.
2. The <c:when > is subtag of <choose > that will include its body if the
condition evaluated be 'true'.
3. The < c:otherwise > is also subtag of < choose > it follows <when >
tags and runs only if all the prior condition evaluated is 'false'.

5. Example 1:
a. newjsp.jsp
Output

6. Example 2:
a. newjsp.jsp
Output

7. JSTL Core <c:forEach> Tag
1. The <c:for each > is an iteration tag used for repeating the nested
body content for fixed number of times or over the collection.
2. These tag used as a good alternative for embedding a Java while,
do-while, or for loop via a scriptlet. The < c:for each > tag is most
commonly used tag because it iterates over a collection of object.

8. Example
a. newjsp.jsp
Output

9. JSTL Core <c:forTokens> Tag
1. The < c:forTokens > tag iterates over tokens which is separated by
the supplied delimeters. It is used for break a string into tokens and
iterate through each of the tokens to generate output.
2. This tag has similar attributes as < c:forEach > tag except one
additional attributes delims which is used for specifying the
characters to be used as delimiters.

10. Example
a. newjsp.jsp
Output

11. JSTL Core <c:param> Tag
1. The < c:param > tag add the parameter in a containing 'import' tag's
URL. It allow the proper URL request parameter to be specified within
URL and it automatically perform any necessary URL encoding.
2. Inside < c:param > tag, the value attribute indicates the parameter
value and name attribute indicates the parameter name.

12. Example
a. newjsp.jsp
Output

13. JSTL Core <c:redirect> Tag
1. The < c:redirect > tag redirects the browser to a new URL. It
supports the context-relative URLs, and the < c:param > tag.
2. It is used for redirecting the browser to an alternate URL by using
automatic URL rewriting.

14. Example
a. newjsp.jsp
Value is set to 0
so url depends
on the condition
before redirecting

15. JSTL Core <c:url> Tag
1. The < c:url > tag creates a URL with optional query parameter. It is
used for url encoding or url formatting. This tag automatically
performs the URL rewriting operation.
2. The JSTL url tag is used as an alternative method of writing call to
the response.encodeURL() method. The advantage of url tag is
proper URL encoding and including the parameters specified by
children. param tag.

16. Example
a. newjsp.jsp
Output