JSP page, JSTL el expression string comparison common methods
Fn:contains to determine if a string contains another string <c:if test= "${fn:contains (name, SearchString)}" >
Fn:containsignorecase determines whether a string contains another string (case-insensitive) <c:if test= "${fn:containsignorecase (name, SearchString)}" >
Fn:endswith determines whether the string ends with a different string <c:if test= "${fn:endswith (filename,". txt ")}" >
Fn:escapexml convert some characters into XML representations, such as the < character should be converted to < ${fn:escapexml (Param:info)}
The position of the fn:indexof substring in the parent string ${fn:indexof (name, "-")}
Fn:join union the data in the array into a new string and uses the specified character format to open ${fn:join (array, ";")}
Fn:length gets the length of the string, or the size of the array ${fn:length (shoppingcart.products)}
Fn:replace replaces the character specified in the string ${fn:replace (text, "-", "?")}
Fn:split the string according to the specified word segmentation ${fn:split (customernames, ";")}
Fn:startswith determines whether a string starts <c:if test= "${fn:startswith (product.id," 100-") with a substring" >
Fn:substring Get substring ${fn:substring (zip, 6,-1)}
Fn:substringafter Gets the substring ${fn:substringafter (zip, "-") starting at the location of a character
Fn:substringbefore Gets the substring ${fn:substringbefore (zip, "-") from the beginning to the location of a character}
Fn:tolowercase converted to lowercase ${fn.tolowercase (product.name)}
Fn:touppercase to uppercase characters ${FN. Uppercase (Product.name)}
Fn:trim Remove the space before and after the string ${fn.trim (name)}
Function
Describe
Fn:contains (string, substring)
Returns true if the parameter string contains the parameter substring
Fn:containsignorecase (string, substring)
Returns true if the parameter string contains the parameter substring (ignoring case)
Fn:endswith (string, suffix)
Returns true if the argument string ends with the argument suffix
Fn:escapexml (String)
Convert XML (and HTML) that has special meaning to the corresponding XML character entity code, and return
Fn:indexof (string, substring)
Returns the position of the first occurrence of the parameter substring in the parameter string
Fn:join (array, separator)
Separator a given array array together with the given spacer, forming a new string and returning it.
Fn:length (item)
Returns the number of elements contained in the parameter item. The parameter item type is an array, a collection, or a string. If it is of type string, the return value is the number of characters in string.
Fn:replace (String, before, after)
Returns a String object. Replaces all occurrences of a parameter before string in a parameter string with a parameter after string, and returns the replaced result
Fn:split (string, separator)
Returns an array that splits the argument string with the parameter separator, and each part of the split is an element of the array
Fn:startswith (string, prefix)
Returns true if the argument string starts with the argument prefix
Fn:substring (string, begin, end)
Returns the string part of the argument, starting with the argument begin to the end position of the argument, including the character of the end position
Fn:substringafter (string, substring)
Returns the part of the string that the parameter substring after in the argument string??
Fn:substringbefore (string, substring)
Returns the part of the string that precedes the argument substring in the argument string
Fn:tolowercase (String)
Converts all characters of the argument string to lowercase and returns it
Fn:touppercase (String)
Converts all characters of the argument string to uppercase and returns it
Fn:trim (String)
When using an El expression in a JSP, it is not possible to use Java-provided functionality such as indexof ().
<c:if test= "${boolean.valueof (requestscope.addresult) ==false}" >
Error
The function ValueOf must be used with a prefix when a default namespace are not specified
The function ValueOf must be used with a prefix when a default namespace are not specified error in the Java EE