el

< %@taglib uri=" http://java.sun.com/jsp/jstl/core " prefix="c"%> <%@ taglib uri=" http://java.sun.com/jsp/jstl/functions " prefix="fn"%> <%@ taglib uri=" http://java.sun.com/jsp/jstl/fmt " prefix="fmt" %> 1、for循环list、取得索引值、定义变量、取出map中的value、if...else循环、日期格式化、空值判断、字符串函数 <c:forEach items="${tableNameVoList}" var="tableNameVar" varStatus="i" > <c:set var="tableNameTemp" value="${ tableNameVar.tableName }" scope="request" /> <!-- 判断是否展示表 --> <c:choose> <c:when test="${tableViewFlag[tableNameTemp] == true}"> <li><a href="#page_${i.index}" id="${i.index}">${tableNameVar.tableNameZh}</a></li> </c

I have JSP that works fine in Tomcat 7 but does not work in Tomcat 6 which I assume is the fact that you cannot call methods (other than getters/setter) from EL 2.1. The method I need to call cannot be named as a getter. I figured out a workaround and thought I would post the answer: If you have Spring installed you can use Spring EL so that you can call methods on objects For example: <spring:eval expression="pic.thumbnailUrl()" var="thumbnail" /> 来源： https://stackoverflow.com/questions/6194164/jspx-el-2-2-method-calling-using-el-2-1

I am trying to understand the path data takes within Struts2, how is data placed on the ValueStack? How can I find out which object is currently present in the ValueStack? What other data can I access from different scopes application, session, request, page? How to decide the scopes my variables should have? Dave Newton That's a lot of questions. The value stack is just a data structure, sort of a combination of a map and stack. Named objects (accessed via the # tag in OGNL) are in the map (like the request scope, say), objects to search through for properties/methods are on the stack. The <s

I'm attempting to use JSPX (pure XML syntax for JSP) and running into what seems like it should work, but doesn't. I'm importing taglibs using namespace declarations in the jsp:root element, then using these later on for elements as well as EL functions: <jsp:root version="2.0" xmlns:jsp="http://java.sun.com/JSP/ xmlns:c="urn:jsptld:/WEB-INF/tld/c.tld" xmlns:fn="urn:jsptld:/WEB-INF/tld/fn.tld"> ... <c:if test="${fn:length(list) > 0"> ... </c:if> ... </jsp:root> I get an exception saying "The attribute prefix fn does not correspond to any imported tag library". Other pages work fine, but this

一、EL 1.概述 EL 全名为Expression Language。 EL表达式可用在所有的HTML和JSP标签中作用是代替JSP页面中复杂的JAVA代码。 EL主要作用如下： (1)获取数据： EL表达式主要用于替换JSP页面中的脚本表达式，以从各种类型的web域 中检索java对象、获取数据。(例如：某个web域 中的对象，访问javabean的属性、访问list集合、访问map集合、访问数组) (2)执行运算： 利用EL表达式可以在JSP页面中执行一些基本的关系运算、逻辑运算和算术运算，以在JSP页面中完成一些简单的逻辑运算。如：${user==null} (3)获取web开发常用对象 EL 表达式定义了一些隐式对象，利用这些隐式对象，web开发人员可以很轻松获得对web常用对象的引用，从而获得这些对象中的数据。 (4)调用Java方法 EL表达式允许用户开发自定义EL函数，以在JSP页面中通过EL表达式调用Java类的方法。 EL表达式是JSP 2.0规范中的一门技术 。因此，若想正确解析EL表达式，需使用支持Servlet2.4/JSP2.0技术的WEB服务器。 注意：当有些Tomcat服务器如不能使用EL表达式时： （1）升级成tomcat6； （2）在JSP中加入<%@ page isELIgnored="false" %>。 <%@ page

The following snippet works fine in Tomcat 6, <c:set var="abc" value="$12,345" /> <c:choose> <c:when test="${abc ne 0}"> <c:out value="PASS"></c:out> </c:when> <c:otherwise> <c:out value="FAIL"></c:out> </c:otherwise> </c:choose> but throws exception in Tomcat 7. javax.el.ELException: Cannot convert $1,2345 of type class java.lang.String to class java.lang.Long at org.apache.el.lang.ELSupport.coerceToNumber(ELSupport.java:304) at org.apache.el.lang.ELSupport.coerceToNumber(ELSupport.java:283) at org.apache.el.lang.ELSupport.equals(ELSupport.java:143) at org.apache.el.parser.AstNotEqual

Section 3.1.4 of the JSF 2.1 Specification says that all attributes of standard components are value expression enabled . I want to assign a value expression to the action attribute of a commandButton: <h:commandButton value="OK" action="#{myBean.valExp}" /> I also defined corresponding getValExp and setValExp methods in the bean's class. However my JSF implementation (JBoss 6) takes that expression to be a method expression and thus yields a "method not found" error because there's no valExp()-method. Am I doing something wrong or is the specification just too sloppy and actually doesn't mean

From web pages like this one, http://www.jsftutorials.net/components/step5.html I understand that the binding attribute in JSF tag/view component is to bind the view component to a Java instance of the UI component in the backing bean. E.g., that's what is done in the following code: <h:inputText value="#{ myBean.someProperty}" binding="#{ myBean.somePropertyInputText}"/> But sometimes I see code like this : <h:commandButton id="t1" binding="#{foo}" value="Hello, World!" onclick="alert('I am #{id:cid(foo)}'); return false;" /> where id:cid is a taglib function which is defined as follow: