El expression Call function __ function

First, let's talk about how OGNL calls.

<s:setname= "albumimg" value= "@com. ISS.PORTAL.BASE.UTIL.FILETOOLS@GETIMGBYWH (#oneAlbum. Cover, ' 100x100 ')" > </s:set>

Secondly

El expressions invoke Custom functions

The function in the 1 El expression call JavaBean is very simple, as long as there is a getxxx method, you can write ${javaben.xxx on the page to invoke the method

2 El expression calls the method in the label <tag>:

as in El Call Jstl, the <fn:contains/> method is as follows: \

<%@ taglib prefix= "FN" uri= "http://java.sun.com/jsp/jstl/functions"%> ${fn:contains

(STRINGA,STRINGB)}

Additionally El calls the custom label method as follows:

1. Create a mytag.tld file under the Webroot\web-inf directory.

2.mytag.tld content is

<?xml version= "1.0" encoding= "UTF-8"?> <taglib "xmlns=" Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xsi:schemalocation= "Http://java.sun.com/xml/ns/j2ee http:/ /java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd "version=" 2.0 "> <tlib-version>1.0</tlib-versio N> <short-name>el</short-name> <function> <!--description of this El method--> <description 

        >calculate string length</description> <name>FunctionsEl</name><!--Call the name of the El method--> 

             <function-class>com.el.code.FunctionsEl</function-class> <function-signature> Java.lang.String Elencode (java.lang.String) </function-signature> <example>${el:funct Ionsel (str)}</example><!--For example--> </function> </taglib> 

3. Under the Com.el.code package, create a new class named Functionsel.

Package com.gouwu.youboy.util;

 

Import java.io.UnsupportedEncodingException;

Import Java.net.URLEncoder;

 

/**

 * @project XXX *

 @author: XXX

 * @version 1.0

 * @Create: 5:41:27 PM

 * @Update:

 * @describe : * * Public

class Functionsel {

    /**

     * transcoding in Chinese

     * @param str Chinese string

     * @return A string after Chinese encoding

     *

    /public static string Elencode (String str) {

        string decodestr = null;

        try {

            decodestr = Urlencoder.encode (str, "UTF-8");

        } catch (Unsupportedencodingexception e) {

            E.printstacktrace ();

        }

        Return Decodestr

    }

 

}

4. Refer to the JSP page as follows:

<%@ taglib prefix= "el" uri= "/web-inf/mytag.tld"%>

${el:functionsel (iklist)}