如何在Struts 2中模拟Struts 1中的嵌套：root？ [英] How to emulate nested:root from Struts 1 in Struts 2?

问题描述

我正在努力将Struts1应用程序转换为Struts2。我有一个包含几个JSP的jsp。这包括JSP都有嵌套：root 标签。

I am working on converting a Struts1 app to Struts2. I have a jsp that has several JSP included. This included JSPs all have the nested:root tag on it.

我发现这个特定标签几乎没有什么，除了类似于 html：root ，所以我'我在我的主JSP中添加了 include 语句，并将 html：form 添加到子JSP中，但它没有'工作。

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.

我最初只是将 s：form 添加到子JSP中，并且子jsp中的代码被传递但是没有处理子JSP中存在的任何标记。

I had initially just addeds: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

应删除/替换所有嵌套标签和所有Struts1标签与Struts2标签相同。

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

Struts2中不需要嵌套标签，因为它是用OGNL驱动的。使用OGNL表达式和 s：include 允许替换嵌套标记。

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

如果用 s来表示内容是不够的：include 你可以使用：动作但它很重，当这个标签执行时它会重新创建一个 valueStack ，所以很少使用它，但自定义标签或包含Fremarker或Velocity的自定义组件模板可以显着改变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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