JSTL tag Library (I) Core tag library and jstl tag library CORE

JSTL tag Library (I) Core tag library and jstl tag library CORE

 

Core)

1. Expression operation

2. Process Control

3. Iterative operations

4. URL operations

 

1. Expression operation

Tag	Syntax	Function	Description
<C: out>	<C: out value = "<string value>" default = "<string default output value>" EscapeXml = "<true | false>"/>	Used to display the results of an expression	① All three attributes can use EL expressions. ② Default is the output when value does not have a value ③ Includes ontology and Ontology ④ If escapeXml is set to true, it is the original output.
<C: set>	<C: set var = "<string variable name>" value = "<string value>" Target = "<string object of the attribute to be modified>" Property = "<string attributes to be modified>" scope = "<string variable range>"/>	Used to save data	① Variable range default Page Page | request | session | application ② Only values can use EL expressions
<C: remove>	<c:remove var="<string>" scope="<string>"/>	Used to remove data

2. Process Control

Tag	Syntax	Function	Description
<C: if>	<C: if test = "<boolean expression>" var = "<string saved to a real value>" Scope = "<string>"> </c: if>	Value of the tag judgment Expression If the expression value is true, the body content is executed.	① Includes ontology and Ontology
<C: choose>	<c:choose> <c:when test="<boolean>"/> ... </c:when> <c:when test="<boolean>"/> ... </c:when> ... ... <c:otherwise> ... </c:otherwise></c:choose>	① <C: choose> as the parent label of <c: when> <c: otherwise> ② <C: otherwise> must be after <c: when>
<C: when>
<C: otherwise>