JSP's Jstl tag

Common Jstl Tags

One, <%@ taglib prefix= "C" uri= "Http://java.sun.com/jsp/jstl/core"%> core tags

1, match the conditions on the output, there is no corresponding else

<c:if test= "conditions" > Output content </c:if>

2, meet a certain conditions, no longer perform the following conditions, no conditions suitable for the execution of otherwise

<c:choose>

<c:when test= "Condition 1" > Output content </c:when>

<c:when test= "Condition 2" > Output content </c:when> ...

<c:otherwise> Output Content </c:otherwise>

</c:choose>

3, if the element name in the Map,var may get the corresponding value through the key and the Value property

<c:foreach items= "Array or collection" Var= "the element name of an array or collection" >

Output results

</c:forEach>

4, the string is delimited, the default is a comma

<c:fortokens items= "string" var= "element name" delims= "delimiter" >

<div>${item}</div>

</c:forTokens>

5. Exception Handling

<c:catch var= "Exception variable name" >

Code snippet that could produce an exception

</c:catch>

6. Output

<c:out value= "${exception variable name. Message}" ></c:out>

7, set properties, scope range order page, request, session, application, if not in the page range created

<c:set var= "Property name" value= "value" scope= "range" ></c:set>

Add a property or attribute assignment to a javabean or map

<c:set vulue= "Value" property= "Property name" target= "JavaBean or map" ></c:set>

<c:set ...>

The value can also be written here

</c:set>

8, delete attributes, scope does not specify in order to find

<c:remove var= "Login" scope= "session"/>

9, equivalent to Jsp:include function

<c:import url= "Address" >

<c:param name= "Variable 1" value= "value" ></c:param> ...

</c:import>

10. redirect

<c:redirect url= "get.jsp" >

<c:param name= "Variable 1" value= "value" ></c:param> ...

</c:redirect>

11. Equivalent to Response.encodeurl method

<c:url value= "Address" ></c:url>

Ii. <%@ taglib prefix= "FMT" uri= "http://java.sun.com/jsp/jstl/fmt"%> formatting tags

1, output a specific format

<fmt:formatdate value= "Time value" pattern= "format"/>

The format can be # or 0 to replace one, if it is #, the first digit of the integer 0 and the decimal point of the last 0 does not show that the fractional part is not enough to round the number of digits

<fmt:formatnumber value= "number" pattern= "format" ></fmt:formatNumber>

2. Convert to date format and number format output

<fmt:parsedate value= "value to convert" pattern= "format" ></fmt:parseDate>

<fmt:parsenumber value= "value to convert" pattern= "format" ></fmt:parseNumber>

Third, <%@ taglib prefix= "FN" uri= "http://java.sun.com/jsp/jstl/functions"%> el function library

1. The function library of the El expression, used in the EL expression

Fn:length (String) Gets the length of the string, combined with the length of the Jstl label output string

<c:out value= ' ${fn:length (String)} ' ></c:out>

More detailed usage refer to JSTL manual!