Struts中如何找到文件的位置？

发布于 2024-11-01 17:23:07 字数 688 浏览 6 评论 0原文

我想知道如何在Struts 中找到文件的位置。文件所在的位置这是程序的一部分：

<filter-mapping>
    <filter-name>LoginFilter</filter-name>
    <url-pattern>*.do</url-pattern>
 </filter-mapping>

 <servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
  <init-param>
   <param-name>config</param-name>
   <param-value>/WEB-INF/struts-config.xml</param-value>
   </init-param>
   <load-on-startup>2</load-on-startup>
 </servlet>

我知道 .do 将是项目中任何文件的扩展名，但我没有获取它的位置。我对struts一无所知。

提前致谢

原文

I want to know that how to find out the location of a file in Struts.
Where the files would be situated
Here is some part of program:

<filter-mapping>
    <filter-name>LoginFilter</filter-name>
    <url-pattern>*.do</url-pattern>
 </filter-mapping>

 <servlet>
  <servlet-name>action</servlet-name>
  <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
  <init-param>
   <param-name>config</param-name>
   <param-value>/WEB-INF/struts-config.xml</param-value>
   </init-param>
   <load-on-startup>2</load-on-startup>
 </servlet>

I know that .do would be the extension of any file in the project but I am not getting its location. I don't know anything about struts.

Thanks in advance

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一人独醉 2024-11-08 17:23:07

您的 .do 是您的 URL 模式（提到@Jigar Joshi），要查看它的映射位置，您必须在浏览器上查看您的 URL：

假设您有 http://localhost： 8080/myapp/login.do，然后 .do 被您的 Web 容器看到，并调用您的 Struts Servlet org.apache.struts.action.ActionServlet >。

然后，Struts ActionServlet 将查看您的相对路径 /login（看看我是如何忽略 .do）并查看它是否映射到您的config 文件（在您的情况下是/WEB-INF/struts-config.xml）。

从那里，Struts ActionServlet 检查是否存在与您的相对路径匹配的操作路径，如下所示：

<action path="/login" type="com.myapp.action.LoginAction" name="LoginForm" scope="request">

</action>

如果找到，Struts 将调用 com.myapp.action.LoginAction 类并调用 execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception 方法（如果该类只是一个简单的 Action 类）。

我希望这有帮助。

在您的元素中，您可能会发现另一个名为的元素，例如：

<forward name="FHome" path="/content/jsp/home.jsp" />

forward name 属性基本上就是您的 Struts 的属性Action 在返回 ActionForward 时调用，代码如下：

public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
     return mapping.findForward("FHome");
}

请记住，struts- 中 action 元素内的 forward config.xml 被称为本地向前。 Global Forward 位于 action 元素之外。

forward 元素的 path 是 Struts 必须调用（以及 web/servlet 容器）呈现的 jsp 页面的相对路径。

希望这能为您解决问题。

Your .do is your URL pattern as (@Jigar Joshi mentioned) to see where it's mapped you will have to look at your URL on your browser:

Supposed your have http://localhost:8080/myapp/login.do, then the .do is seeing by your web container and it calls your Struts Servlet org.apache.struts.action.ActionServlet.

The Struts ActionServlet will then see your relative path /login (see how I've ignored the .do) and see whether it's mapped on your config file (in your case /WEB-INF/struts-config.xml).

From there, Struts ActionServlet check if there's an action path that matches your relative path, something like this:

<action path="/login" type="com.myapp.action.LoginAction" name="LoginForm" scope="request">

</action>

If that <action> is found, Struts will call com.myapp.action.LoginAction class and call the execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception method (if the class is just a simple Action class).

I hope this helps.

Inside your <action> element you might find another element called <forward>, example:

<forward name="FHome" path="/content/jsp/home.jsp" />

The forward name attribute is basically what your Struts Action calls when it returns an ActionForward, a code like this:

public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
     return mapping.findForward("FHome");
}

Bear in mind that a forward inside an action element in struts-config.xml is called a local forward. A Global Forward sits outside the action element.

The path of the forward element is the relative path of the jsp page that Struts has to call (and the web/servlet container) to render.

Hope this clears things out for you.

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