如何在Struts 2中比较URL请求参数中的单个字符 [英] How to compare a single character from url request parameter in Struts 2

问题描述

我正在读取具有单个字符的url参数.它将是Y或N.我必须写一个条件来检查它是Y还是N并相应地做一些事情.这是我写的，但似乎没有用(总是转到其他地方).网址是

I am reading the url parameter which has a single character. It will either be Y or N. I have to write a condition to check if it Y or N and do something accordingly. This is what I wrote but does not seem to work (always goes to else). The url is

http://wwww.helloworld.com/showInfo?thecountry=us& theconditionTypeInUrl = Y

  <s:set var="theUrl" value="%{#parameters.theconditionTypeInUrl}" />
  <s:if test="%{#theUrl == 'Y'}">

  </s:if>
  <s:else>

  </s:else>

我也尝试过

 <s:set var="theUrl" value='%{#parameters.theconditionTypeInUrl}' />

  <s:if test='%{#theUrl == "Y"}'>

 </s:if>
 <s:else>

 </s:else>

struts.xml包含

the struts.xml contains

<action name="showInfo" class="showInfoAction">
   <result name="success" type="tiles">dis.Info</result>
   <result name="no_results" type="tiles">dis.noInfo</result>
</action>

推荐答案

通常，请求参数由params拦截器处理.动作配置应在堆栈中包含此拦截器.如果未明确引用此拦截器，则使用已经包含params拦截器的defaultStack.您需要的是将操作扩展为"struts-default"的程序包.

Usually request parameters are processed by the params interceptor. The action configuration should have this interceptor included in the stack. If you not referencing this interceptor explicitly the defaultStack is used that already contains the params interceptor. What you need is the package for the action to be extended the "struts-default".

<package name="default" namespace="/" extends="struts-default">

然后将处理参数并将其放入action属性，您可以在其中通过实现getter和setter通过OGNL访问它们.

Then parameters will be processed and put to the action attributes, where you could access them via OGNL by implementing getter and setter.

另一种方法是实现 ParameterAware 通过您的操作.注入参数后，可以从valueStack顶部的操作中使用该参数，并且可以通过

Another way is to implement ParameterAware by your action. After injecting parameters it could be available from the action that is on top of the valueStack and you could get parameters via

<s:if test="parameters['theconditionTypeInUrl'] == 'Y'">  

在为参数属性添加吸气剂之后

after adding getter for parameters attribute

Map getParameters(){
  return this.parameters;
}

您可以找到使用#parameters键通过OGNL尝试从操作上下文映射访问请求参数的方式.在if标记中访问参数可能会遇到麻烦，请参见此处.

The way you are trying access request parameters from the action context map via OGNL using #parameters key. There could be troubles accessing parameters in the if tag, see here.

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