SSH：Struts1框架（自定义标签函数库）

JSTL函数库

1.JstlFnAction.java

 

package com; import java.util.ArrayList; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; public class JstlFnAction extends Action {  @Override  public ActionForward execute(ActionMapping mapping, ActionForm form,    HttpServletRequest request, HttpServletResponse response)    throws Exception {      request.setAttribute("hello", "Hello World !");      List list = new ArrayList();   list.add("a");   list.add("b");   request.setAttribute("list", list);      request.setAttribute("username", "KIMURA SAORI");   return mapping.findForward("success");  } }

 

2.jstl_fn.jsp

 

<%@ page language="java" contentType="text/html; charset=GB18030"     pageEncoding="GB18030"%> <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> <%@ taglib prefix="mf" uri="myURI" %>   测试JSTL函数库   JSTL函数库  hello.length(JSP脚本)=<%=request.getAttribute("hello").toString().length() %>  hello.length(JSTL标签)=${fn:length(hello) }  list.size=${fn:length(list) }     测试自定义函数库  sayHello:${mf:sayHello(username) }

 

 

注：使用自定义函数库

* 定义类和方法（方法必须是public static）

* 编写自定义tld文件，并且将此文件放到WEB-INF或WEB-INF任意子目录下

 

3.my.tld，放到WEB-INF下

 

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xsi:schemaLocation="http://java.sun.com/xml/ns/j2eehttp://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"   version="2.0">       my functions library   my functions   1.1   mf   myURI          sayHello     com.MyFunction     java.lang.String sayHello(java.lang.String)

 

4.MyFunction.java

 

package com; public class MyFunction {    public static String sayHello(String name) {   return "Hello "+name+" !";  } }

 

 

运行结果：