使用Action数据模型值在Struts2 JSP中调用静态方法helper类 [英] Calling static method helper class in Struts2 JSP with Action data model value
问题描述
我是Struts2的新手。我在一个Action中使用Struts2和典型的datamodel UserItem
。使用Struts标记< s:property value =userItem.foo/>
时,数据模型看起来不太好。
I'm a Struts2 newbie. I'm using Struts2 with the typical datamodel UserItem
inside an Action. The datamodel doesn't look good when using with the Struts tag <s:property value="userItem.foo"/>
.
我想要做的是编写一个静态的util方法 Helper.printNice(Foo)
,它接受参数Foo并输出Foo中包含的值用户友好的显示。
What I want to do is write a static util method Helper.printNice(Foo)
that takes parameter Foo and prints out the value contained in Foo in a user-friendly display.
如何将Struts属性标记与静态方法一起使用?像这样的
com.helper.Helper.printNice(< s:property value =userItem.foo/>)
。
How do I use the Struts property tag with the static method? Something like this
com.helper.Helper.printNice(<s:property value="userItem.foo"/>)
.
原因是我的网络应用程序正在读取供应商填充的数据,在许多列中看起来像这个[string1,string2,...]。显然,我不希望以这种格式显示给最终用户。辅助方法会使它看起来像string1< br> string2< br>等...
The reason for this is my web app is reading data populated by a vendor, which looks like this ["string1", "string2" , ...] in many columns. Obviously, I don't want to display in this format to the end user. The helper method would make it look like string1 <br> string2<br>, etc...
推荐答案
编辑
从 2.3.20及更高版本,静态方法访问将不再起作用,即使在配置中激活也是如此。
From 2.3.20 and higher, static method access won't work anymore, even if activated in the configuration.
对于静态方法访问你需要:
For static methods access you need:
在Struts.xml中
in Struts.xml
<constant name="struts.ognl.allowStaticMethodAccess" value="true"/>
<s:property value="@com.your.full.package.Classname@methodName(optionalParameters)" />
但正如里斯指出的那样,如果不是非常必要,应该避免这种情况,因为它不是最好的练习。
But as pointed out by rees, this should be avoided if not strictly necessary, because it's not a best practice.
在你的具体情况下,我想包含[String1,String2,...]的对象是一个List,或一个Vector,或者什么的像这样。
In your specific case, i guess the Object containing ["String1","String2",...] is a List, or a Vector, or something like this.
然后你在JSP中需要的只是< s:iterator>
标签,如下所示:
Then all you need in your JSP is the <s:iterator>
tag like this:
<s:iterator name="yourObjectContainingAListOfString">
<s:property />
<br/>
</s:iterator>
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