EL函数的操纵[Java编程]

[平台]:Tomcat6

Step1:

编写所需求的类,将编译生成的el.ELFunction复制到WEB-INF/中.

package el;

public class ELFunction{
public static String toUpper(String str){
return str.toUpperCase();
}
}

注意,用于EL中的函数需定义为static,不然会出错.

Step2:

在WEB-INF/tlds中增添el.tld,内容以下 :

<?xml version = '1.0' encoding = 'GBK'?>
<taglib 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" xmlns="http://java.sun.com/xml/ns/j2ee">
<tlib-version>1.0</tlib-version>
<short-name>fc</short-name>
<uri>http://wintys/el</uri>
<function>
<name>toUpper</name>
<function-class>el.ELFunction</function-class>
<function-signature>
java.lang.String toUpper(java.lang.String)
</function-signature>
</function>
</taglib>

Step3:

在WEB-INF/web.xml中增添:

<taglib>
<taglib-uri>http://wintys/el</taglib-uri>
<taglib-location>/WEB-INF/tlds/el.tld</taglib-location>
</taglib>

Step4:

编写测试页面ELFunction.jsp:

<%@page contentType="text/html;charset=GBK" %>
<%@taglib uri="http://wintys/el" prefix="myfun" %>
EL Function:<br />
${myfun:toUpper("abcde")}

重启Tomcat后运行ELFunction.jsp便可得到后果.