[JSP] [JSTL] Page Call function--it ${FN:} built-in function, is inferred that the string is empty, replace the carriage

Call function in Page--${FN:} Built-in function

Descriptive description of function

• Fn:contains (string, substring) assumes that the number of parameters in the string includes the substring, which returns true
• Fn:containsignorecase (string, substring) assumes that the reference string includes the parameter substring (ignoring uppercase and lowercase) and returns true
• Fn:endswith (string, suffix) assumes that the parameter string ends with a reference of suffix and returns true
• Fn:escapexml (String) translates the XML (and HTML) with special meaning into the corresponding XML character entity code, and returns
• Fn:indexof (string, substring) returns the position of the first occurrence of the parameter substring in the parameters string
• Fn:join (array, separator) strings a given array of arrays together with the given spacer separator, forming a new string and returning it.
• Fn:length (item) returns the number of elements included in the parameter item. The parameter item type is an array, a collection, or a string.

  Assumes a string type, and the return value is the number of characters in string.

• Fn:replace (String, before, after) returns a String object.

  Replaces all occurrences of the before string in the parameter string with the after string, and returns the replaced result

• Fn:split (string, separator) returns an array with the number of parameters separator as the cut-off string. Each part of the cut is an element of the array
• Fn:startswith (string, prefix) assumes that the parameter string starts with the number of references, and returns True, prefix
• Fn:substring (string, begin, end) returns the reference string part string, starting at the start of the reference to the parameter end position, including the character of the end position
• Fn:substringafter (string, substring) returns the portion of the string that follows the substring in the parameter string
• Fn:substringbefore (string, substring) returns the part of the string that precedes the parameter substring in the parameter string
• Fn:tolowercase (string) turns all the characters in the string to lowercase and returns
• Fn:touppercase (String) capitalizes all characters of the reference string and returns it
• Fn:trim (string) removes whitespace from the end of the parameter string. and return it to

To illustrate:

<c:choose>    <c:when test= "${fn:length (audit_message) >0}" >        <c:foreach var= "message" items = "${audit_message}" >            <li>                <span>                    <strong> ${message.title}</strong>                </span>            </li>        </c:forEach>        <c:if test= "${audit_message_more}" >    <li >        <div class= "desc clearfix" >     <a href= "<%=basepath%>manage/message/list.action" > Many other >></a> </div>            </li></c:if>    </c:when>    <c:otherwise>            </c:otherwise></c:choose>

Jstl inferred if the character is empty

1. <c:when test="${not Empty Alloweduploadimageextension}">

Replace carriage return:<span> in the display contains carriage return is not carriage return, all often need to replace the carriage return to <br> ability normal display return effect.

Error: ${fn:replace (source, ' \ n ', ' <br> ')} This method will cause an error.

Correct:<% request.setattribute ("VEnter", "\ n"); %>

${fn:replace (source, VEnter, "<br>")

Copyright notice: This article blog original articles, blogs, without consent, may not be reproduced.

[JSP] [JSTL] Page Call function--it ${FN:} built-in function, is inferred that the string is empty, replace the carriage