ognl

In Struts2 backend, I have an action class instance variable, eg: keyName . A dynamic key returned to view(JSP). This keyName variable is set using a request parameter using POST method. Depending on the request parameter value, the keyName will vary. In JSP, I am using <s:property value="getText(keyName)" /> to show the label corresponding to the key given by keyName variable. When I send an EL expression for example ${90-40} to keyName this expression is being evaluated and resulting in showing 50 on the UI. How can we avoid or prevent such EL injection with getText() ? Is there any other

I am new to Struts 2. I am studying it from the book Struts2 In Action. I am having difficulty in understanding some concepts in OGNL which are as follows- We know that params interceptor moves the data from the request parameters to the action object in ValueStack . Now while reading, I came upon a line that says- "The tricky part of the job is mapping the name of the parameter to an actual property on the ValueStack . This is where OGNL comes in. The params interceptor interprets the request parameter name as an OGNL expression to locate the correct destination property on the ValueStack".

一、首先关于Struts2框架： ①特点： 1、通用性 2、可扩展性 struts2可以自定义类型转换器（尚待深入）、自定义拦截器。 3、非侵入式 不会污染其他模块 ②配置 1、Web工程的web.xml文件配置filter拦截器（拦截*.action请求） 2、struts.xml首先要关联约束文档 <package name="default" namespace="/" extends="strutd-default"> <action name="saveBook" class="com.atguigu.bean.Book" method="save"> <result name="toDetailPage">detailpage.jsp</result> </action> </package> 标签package的作用是定义一个功能模块，其name属性作为标识是必填项，便于其他package引用，extends是继承了默认的配置。namespace也采用了默认配置，如果采用自定义名称空间，则访问这个package中定义的action时，必须在路径中加上名称空间值。 action对应着请求，class属性指定处理请求的类，method属性为处理请求的具体方法，result则对应响应，注意其name属性值。 ③Action类 类中的set方法是注入请求参数

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

本文将力求用最简单的语言和实例，介绍一下 OGNL 的语法规则，文章主要内容参考自官方文档 http://commons.apache.org/proper/commons-ognl/language-guide.html 本篇主要是语法介绍篇，实战放在一下篇 因为本篇文章将是后 quick-fix 2.0 版本支持 ognl 的前导篇，先提前放出 <!-- more --> 1. 前言 ognl，全称 Object Graphic Navigation Language(对象图导航语言)，根据约定的一些简单的规则，组装一个利于阅读、可执行的表达式语句 如下面是一个典型的表达式 "name".toCharArray()[0].numericValue.toString() 即便完全不懂 ognl，单纯的以 java 的基础知识就可以看懂，而这就是 ognl 的魅力所在 （学习一点点东西，就可以马上入手） 2. 对象定位 说明，这一小节的内容为我个人为了方便理解而分类的，并不官方 我们知道在 java 中，一切都是对象，所以我们的 ognl 表达式必然是着手于某一个对象的，通常在 ognl 中，可以将待执行目标对象划分为三类 简单对象：(如基本数据类型，String) 非简单对象：(非简单对象，实例访问) 静态对象：(静态类) 在 gonl 的语法中，上面三种 case

本文将力求用最简单的语言和实例，介绍一下 OGNL 的语法规则，文章主要内容参考自官方文档 http://commons.apache.org/proper/commons-ognl/language-guide.html 本篇主要是语法介绍篇，实战放在一下篇 因为本篇文章将是后 quick-fix 2.0 版本支持 ognl 的前导篇，先提前放出 <!-- more --> 1. 前言 ognl，全称 Object Graphic Navigation Language(对象图导航语言)，根据约定的一些简单的规则，组装一个利于阅读、可执行的表达式语句 如下面是一个典型的表达式 "name".toCharArray()[0].numericValue.toString() 即便完全不懂 ognl，单纯的以 java 的基础知识就可以看懂，而这就是 ognl 的魅力所在 （学习一点点东西，就可以马上入手） 2. 对象定位 说明，这一小节的内容为我个人为了方便理解而分类的，并不官方 我们知道在 java 中，一切都是对象，所以我们的 ognl 表达式必然是着手于某一个对象的，通常在 ognl 中，可以将待执行目标对象划分为三类 简单对象：(如基本数据类型，String) 非简单对象：(非简单对象，实例访问) 静态对象：(静态类) 在 gonl 的语法中，上面三种 case

I have searchKey as a variable in action class and model-driven bean object. public class PaymentGateWayAction extends ActionSupport implements ModelDriven<PaymentResponseDTO> { private String searchKey; private PaymentResponseDTO paymentResponseDTO = new PaymentResponseDTO(); // ... } searchKey is also a variable in PaymentResponseDTO . I need to access searchKey from the action class and modeldriven bean based on some conditions. Having varible with same name is bad. But The above one is already developed. If I do any modification in Java file, I need to do many modifications which are

I am a newbie in web development. Using Struts2, I have a comma separated String of my images captions. While iterating the images to render on JSP I need to display caption along with specific images and could not get any specific tag to split caption String over delimiter and to access specific caption. I am trying the below code and don't know what to use in place of something to get the current iteration index in iterator. <s:iterator value="images" status="incr"> <%= ((String)request.getAttribute("imageCaptionsString")).split(",")[something]%> </s:iterator> I know that using scriptlets

We are using the s:select to show a list of string from resource bundle. In the Action: //bank codes will be something [12,13,14] List<String> bankCodesList; //with setter and getter String selectedBankCode; In the message resources each bank will have a name: bank.code.12= ALFM Bank bank.code.13= RIHN Bank .... In the JSP: <s:select name = "selectedBankCode" list = "bankCodesList" listKey = "toString()" listValue = "%{getText('bank.code.' + toString())}" /> As the bank list is List<String> we used toString() to get the key and used toString() to get value from resource bundle. I excepted to