使用Struts 2.0调用tiles.xml中的ActionClass
我回顾了struts2.0的tiles示例,发现在tiles.xml中jsp页面的调用方式如下:
<definition name="welcome" extends="baseLayout">
<put-attribute name="title" value="Welcome"/>
<put-attribute name="body" value="/welcome.jsp"/>
如何调用它,
<definition name="friends" extends="baseLayout">
<put-attribute name="title" value="Friends"/>
<put-attribute name="body" value="/checkActionLink.action"/>
但我的问题是,如果我想调用操作类而不是 .jsp 页面,而不是像当我尝试编写执行上述代码时 而不是显示未找到 checkActionLink.action 的错误......预先感谢您的帮助......
以下是 web.xml 文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>Struts2Example15</display-name>
<servlet>
<servlet-name>tiles</servlet-name>
<servlet-class>org.apache.tiles.web.startup.TilesServlet</servlet-class>
<init-param>
<param-name>org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG</param-name>
<param-value>/WEB-INF/tiles.xml</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<listener>
<listener-class>org.apache.struts2.tiles.StrutsTilesListener</listener-class>
</listener>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>FORWARD</dispatcher>
<dispatcher>INCLUDE</dispatcher>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
I reviewed the example of tiles with struts2.0 and found that in tiles.xml jsp pages are called like:
<definition name="welcome" extends="baseLayout">
<put-attribute name="title" value="Welcome"/>
<put-attribute name="body" value="/welcome.jsp"/>
BUT my question is if I want to call the action class instead of .jsp pages than how to call it like
<definition name="friends" extends="baseLayout">
<put-attribute name="title" value="Friends"/>
<put-attribute name="body" value="/checkActionLink.action"/>
when I am trying to write to execute the above code than its showing the error that checkActionLink.action is not found....thanks in advance for the help.....
Following is the web.xml file
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<display-name>Struts2Example15</display-name>
<servlet>
<servlet-name>tiles</servlet-name>
<servlet-class>org.apache.tiles.web.startup.TilesServlet</servlet-class>
<init-param>
<param-name>org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG</param-name>
<param-value>/WEB-INF/tiles.xml</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<listener>
<listener-class>org.apache.struts2.tiles.StrutsTilesListener</listener-class>
</listener>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>FORWARD</dispatcher>
<dispatcher>INCLUDE</dispatcher>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
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经过大量研究,我发现添加以下标签:
web.xml 中的
FORWARD
问题得到解决。现在问题来了,为什么呢?
根据我的理解,当我们添加任何操作作为
标记的 value 属性的值时,请求将转发到提到的操作,因此操作执行成功。以前缺少
FORWARD
标签,因此导致了此问题。如果我的理解有任何修正,我将不胜感激。
谢谢。快乐编码:)。
After so much research I found out that adding the following tag:
<dispatcher>FORWARD</dispatcher>
in the web.xml the issue gets resolved.Now the question arises why?
As per my understanding when we add any action as the value of value attribute of the
<put-attribute/>
tag the request is forwarded to the mentioned action so the action is executed successfully.Previously
<dispatcher>FORWARD</dispatcher>
tag was missing so this issue was caused.I would really appreciate if any correction is there in my understanding.
Thanks. Happy Coding :).
我认为你不能。您需要创建一个 jsp 并在其中使用 struts2 操作标记。它可以调用一个操作并渲染其页面的一部分。如果你只使用action标签来制作jsp,你可能会得到你想要的效果。从未尝试过此操作,但您可能可以在调用 jsp 之前将tiles中的操作名称和命名空间插入到操作标记中。
我很想知道这对您来说效果如何。
I don't think you can. You'll need to create a jsp and use the struts2 action tag in it. That can call an action and render part of it's page. If you make a jsp only using the action tag, you'll probably get the effect you want. Have never tried this, but you can probably insert the name of the action and namespace from tiles into the action tag before the jsp is invoked.
I would be very interested to hear how this works out for you.