如何模拟< nested:root>来自Struts 2中的Struts 1? [英] How to emulate <nested:root> from Struts 1 in Struts 2?

问题描述

我正在将Struts 1应用程序转换为Struts2.我有一个包含几个JSP的jsp.包括在内的所有JSP都在其上带有< nested:root> 标记.

I am working on converting a Struts 1 app to Struts 2. I have a jsp that has several JSP included. This included JSPs all have the <nested:root> tag on it.

除了与< html:root> 类似，我在这个特定标签上几乎没有发现什么，所以我在主代码中添加了 include 语句JSP和我在子JSP中添加了< html:form> ，但是没有用.

I have found little to nothing on this particular tag except that is similar to <html:root>, so I've added the include statement in my main JSP and I added the <html:form> to the sub JSPs but it didn't work.

起初我只是在子JSP中添加了< s:form> ，子JSP中的代码被传递了，但是子JSP中存在的所有标记均未得到处理.

I had initially just added <s:form> to the sub JSPs and the code in the sub JSP was passed along but none of the tags existing in the sub JSP were processed.

推荐答案

所有 nested 标签和所有Struts1标签都应使用等效的Struts2标签删除/替换.

All nested tags and all Struts1 tags should be removed/replaced with equivalent Struts2 tags.

Struts2不需要嵌套标签，因为它带有OGNL.使用OGNL表达式和 < s:include> 允许替换嵌套标签.

Nested tags not needed in Struts2 because it's powered with OGNL. Using OGNL expressions and <s:include> allows to replace nested tags.

如果使用 s:include 渲染内容还不够，则可以使用 < s:action> 但它很重，并且在执行此标记时会重新创建 valueStack ，因此很少使用，但自定义包括Fremarker或Velocity模板的标签或自定义组件可以显着更改渲染时间并允许自定义.

If it's not enough to render content with s:include you can use <s:action> but it's heavy and it recreates a valueStack when this tag executes, so it's rarely used, but custom tags or custom components that include Fremarker or Velocity templates can significantly change the rendering time and allows customization.

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