Jstl Common label collation <c:out><c:fortoken>, basic expression Ne,el

<c:url value= "http://baidu.com" var= "url" scope= "session"/>

The <c:url> tag has the following properties:

Attribute	Description	Required	Default
Value	Root URL	Yes	None
Context	/Name of the local Web application after	No	Current application
Var	The name of the variable, the URL of the exposed handle	No	Print to Page
Scope	The scope of the variable exposes the processed URL	No	Page

<c:forTokens>

Example 1:

<c:fortokens items= "Zara,nuha,roshy" delims= "," var= "name" >
<c:out value= "${name}"/><p>
</c:forTokens>

Example 2:

2. <c:fortokens var="str" items="${sourcestr}" delims= "|," varstatus="status" >

4. <c:out value="${status.count}" />//the iteration count of the current iteration starting at 1

6. <c:out value="${status.index}" />//the iteration index of the current iteration starting at 0

8. <c:if test="${status.last}">//is used to indicate whether the current iteration is the last iteration

10. <br> Total is divided into <c:out value="${status.count}" /> segment.

12. </c:if>

14. <c:out value="${status.index}" />//the iteration index of the current iteration starting at 0

16. </c:forTokens>

C:fortokens Property Description Table
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Reference

Varstatus, which describe the current state of the iteration, the meanings of these properties are as follows:

Current: The item (in the collection) for this iteration.

Index: The current iteration of this iteration, starting at 0.

Count: The iteration count that is currently starting at 1 for this iteration.

First: Used to indicate whether the current iteration is the initial iteration, which is a Boolean type.

Last: Used to indicate whether the current iteration is the final iteration, which is a Boolean type.

The value of the Begin:begin property.

The value of the End:end property

The value of the Step:step property

Expressions for Jstl

Table 1. El Implicit Object

Category	Identifier	Describe
Jsp	pageContext	PageContextinstance corresponds to the processing of the current page
Scope	pageScope	Class associated with the name and value of the page scope property Map
	requestScope	Class associated with the name and value of the request scope property Map
	sessionScope	Class associated with the name and value of a session-scoped property Map
	applicationScope	Class associated with the name and value of the application scope property Map
Request parameters	param	Class that stores the primary value of a request parameter by name Map
	paramValues	Class that stores all the values of a request parameter as String an array Map
Request Header	header	class for storing request header primary values by name Map
	headerValues	class to store all the values of the request header as String an array Map
Cookies	cookie	class to store the cookie that is included with the request by name Map
Initialize parameters	initParam	Classes that store Web application context initialization parameters by name Map

Table 2. El operator

Category	Operator
Arithmetic operators	+, - , * , / (or div ) and % /or mod
Relational operators	==(or eq ), != (or), (or), (or), (or) ne < lt > gt <= le and >= / ge or
logical operators	&&(or) and , || (or or ) and ! /or not
Validation operators	empty

Table 3. El operator Precedence (top-to-bottom, left-to-right)

[],.

()

Unary,,, - not !empty

*,,, / div % ,mod

+, binary-

(),,,,,, <</code> > <= >= lt gt le ,ge

==, != , eq ,ne

&&、and

||、or

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Jstl Common label collation <c:out><c:fortoken>, basic expression Ne,el