测试环境： tomcat7,jdk1.7
1.First make a class with a static method like so:
package your.package;public class Functions { public static String hello(String name) { return "Hiya, " + name + "."; }}
2. Then make a file called mytaglib.tld in WEB-INF/tags/:
<?xml version="1.0" encoding="ISO-8859-1" ?> <taglib xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd" version="2.1"> <tlib-version>1.0</tlib-version> <uri>http://www.your.url/tablib_name</uri> <function> <name>hello</name> <function-class>your.package.Functions</function-class> <function-signature>java.lang.String hello(java.lang.String)</function-signature> </function> </taglib>
3. The uri would be used if we were accessing this directly, but instead we’ll be accessing the url from the web.xml below:
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" 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-app_2_4.xsd" version="2.4"> ... <jsp-config> <taglib> <taglib-uri> http://some.thing/mine </taglib-uri> <taglib-location> /WEB-INF/tags/mytaglib.tld </taglib-location> </taglib> </jsp-config> ... </web-app>
4. Note we’re pointing to the mytaglib.tld file just created. And taglib-uri is how we’ll refer to it in the JSP:
<%@ taglib uri="http://some.thing/mine" prefix="a" %> ${a:hello("Aaron")}