el/jstl-jsp page more simple output mode

1.EL (expression Language): Expression language for page output

Format: ${expression}

El supports arithmetic, relational operations "common EQ to compare strings or judge equality", logical operations

El accesses objects in space, [Class. Object]

2.JSTL Core Tag Library: simplifies labeling of JSP page designs

1. Download the jar pack    Jstl.jar and Standard.jar into the Lib directory
2. JSP introduces     <% @taglib prefix= "C" uri= "Http://java.sun.com/jsp/jstl/core"%>    URI: Uniform Resource identifiers (including URLs)

3. Basic tags include var for use variables and scope scope

<c:out>
<c:out value= "${}"/>

<c:set> Set JSP space values, or container values
Example: <c:set var= "name" value= "" scope= "Session"/>
<c:remove>

　 4. Condition label

<c:if>
Example: <c:if test= "${1>0} var=" R "scope=" page "> page display </c:if>
<c:choose>,<c:when>,<c:otherwise>
Equivalent to the IF/ELSE structure, the page display content is placed between the start and end tags to

5. Iteration Labels
<c:foreach> "Popular"

<c:foreach var= "s" items= "${an array or set of iterations}"  varststus= "status" >    ${status.count}    ${str} </c:foreach>

Where items are iterated arrays or collections, Varstatus is the variable name of the iteration state object "where the iteration value is stored"　　　　　　　

　

　　

　　

el/jstl-jsp page more simple output mode