Servlet & JSP (21)

The functions tag library is a standard El function set defined in jstl. The functions defined in the functions tag library are basically functions that operate on strings. To use the functions tag library on the JSP page, use the taglib command to specify the referenced tag library. For example:

 
<% @ Taglib prefix = "FN" uri = "http://java.sun.com/jsp/jstl/functions" %>
 

16 functions in the functions tag library.

FN: Contains label

Determines whether a string contains a specified substring. The syntax format is as follows:

 
FN: Contains (string, substring)-> Boolean
 

FN: containsignorecase tag

Determines whether a string contains a specified substring, regardless of the case. The syntax format is as follows:

 
FN: containsignorecase (string, substring)-> Boolean
 

FN: startswith tag

Determines whether a string starts with a specified prefix. The syntax format is as follows:

 
FN: startswith (string, prefix)-> Boolean
 

FN: endwith tag

Determines whether a string ends with a specified suffix. The syntax format is as follows:

 
FN: endwith (string, suffix)-> Boolean
 

FN: indexof tag

Searches for the specified substring in a string and returns the index position of the first character of the first matched string.

 
FN: indexof (string, substring)-> int
 

FN: Replace label

Replace a part of a string with another string, return the replacement, and return the replacement result. The syntax format is as follows:

 
FN: Replace (inputstring, beforesubstring, aftersubstring)-> string
 

FN: substring tag

Truncates a part of a string. The syntax format is as follows:

 
FN: substring (string, beginindex, endindex)-> string
 

FN: substringbefore tag

Returns the string before the substring in a string. The syntax format is as follows:

FN: substringbefore (string, substring)-> string
 

FN: substringafter tag

Returns the string after the specified substring. The syntax format is as follows:

 
FN: substringafter (string, substring)-> string
 

FN: spilt tag

Splits a string into a string array. The syntax format is as follows:

 
FN: spilt (string, delimiters)-> string
 

FN: Join label

Concatenates all elements in the array into a string. The syntax format is as follows:

 
FN: Join (array, separator)-> string
 

FN: tolowercase tag

Converts all characters in a string to lowercase. The syntax format is as follows:

 
FN: tolowercase (string)-> string
 

FN: touppercase tag

Converts all characters in a string to uppercase.

FN: touppercase (string)-> string
 

FN: trim tag

Removes the spaces before and after the string.

 
FN: trim (string)-> string
 

FN: escapexml label

Convert the character "<", ">", "&" in the string to the corresponding character reference or pre-defined object reference. The syntax format is as follows:

 
FN: escapexml (string)-> string
 

FN: length label

Returns the number of elements in a set or the number of characters in a string.

 
FN: length (input)-> int
 

Reprinted please indicate the source: http://blog.csdn.net/iAm333