Re: Can we use multiple Controllers in a single web-application?

[vi...@staff.mcgill.ca]

Hi,

You should have one controller servlet by webapp instance, as specified in the
struts user guide.
However, you can create a multi module web application if you want.
http://struts.apache.org/userGuide/configuration.html#dd_config_modules

A solution for your problem is maybe to have something like this in the web.xml:
<servlet>
<servlet-name>controller1</servlet-name>
<servlet-class>com.test.struts.Controller1</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/config1.xml</param-value>
</init-param>
<init-param>
<param-name>debug</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>2</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
..
<servlet-mapping>
      <servlet-name>controller1</servlet-name>
      <url-pattern>*.go</url-pattern>
</servlet-mapping>
<servlet-mapping>
     <servlet-name>controller1</servlet-name>
      <url-pattern>*.do</url-pattern>
</servlet-mapping>

You can add requirements by implemeting your RequestProcessor class

Best regards,

V.


Selon Amith M <am...@slk-soft.com>:

> hi,
>
> i have a requirement where we need to use two Controllers (one for each
> module) in our project.
>
> my web.xml looks like this..........
>
> <?xml version="1.0" encoding="UTF-8"?>
> <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application
> 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
> <web-app>
>
> <servlet>
> <servlet-name>controller1</servlet-name>
> <servlet-class>com.test.struts.Controller1</servlet-class>
> <init-param>
> <param-name>config</param-name>
> <param-value>/WEB-INF/config1.xml</param-value>
> </init-param>
> <init-param>
> <param-name>debug</param-name>
> <param-value>2</param-value>
> </init-param>
> <init-param>
> <param-name>detail</param-name>
> <param-value>2</param-value>
> </init-param>
> <load-on-startup>2</load-on-startup>
> </servlet>
>
> <servlet>
> <servlet-name>controller2</servlet-name>
> <servlet-class>com.test.struts.Controller2</servlet-class>
> <init-param>
> <param-name>config</param-name>
> <param-value>/WEB-INF/config2.xml</param-value>
> </init-param>
> <init-param>
> <param-name>debug</param-name>
> <param-value>2</param-value>
> </init-param>
> <init-param>
> <param-name>detail</param-name>
> <param-value>2</param-value>
> </init-param>
> <load-on-startup>2</load-on-startup>
> </servlet>
>
> <servlet-mapping>
> <servlet-name>controller1</servlet-name>
> <url-pattern>/controller1/*</url-pattern>
> </servlet-mapping>
>
> <servlet-mapping>
> <servlet-name>controller2</servlet-name>
> <url-pattern>*.do</url-pattern>
> </servlet-mapping>
>
> <welcome-file-list>
> <welcome-file>index.jsp</welcome-file>
> </welcome-file-list>
>
> <taglib>
> <taglib-uri>/bean</taglib-uri>
> <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
> </taglib>
> <taglib>
> <taglib-uri>/html</taglib-uri>
> <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
> </taglib>
> <taglib>
> <taglib-uri>/logic</taglib-uri>
> <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
> </taglib>
>
> </web-app>
>
> ..both controller1 and controller2 extend ActionServlet. when using
> controller2 i use the URL
> http://localhost:9080/MultipleControllers/Welcome.do
>
> (the struts-config snippet corresponding to Welcome.do is shown below
> )
>
> <action
>
> path="/Welcome"
>
> type="org.apache.struts.actions.ForwardAction"
>
> parameter="/pages/Welcome.jsp"/>
>
>
> and it works fine.....next i want to use the controller1 and i use the url
>
> http://localhost:9080/MultipleControllers/controller1/WelcomePage
>
> (the struts-config snippet corresponding to "WelcomePage" is shown below
> )
> <action
>
> path="/WelcomePage"
>
> type="org.apache.struts.actions.ForwardAction"
>
> parameter="/WorkFlow/pages/WorkFlowWelcome.jsp"/>
>
>
> ..now it gives me an error
>
> org.apache.struts.action.RequestProcessor Invalid path /WorkFlow/WelcomePage
> was requested
>
> i dont know why this error comes up.
>
> i also wanted to clear some of my doubts connected with the same.
>
> 1)Is it possible to have Multiple Controllers in a single web-applicaion?
> (both these controllers are extended from the ActionServlet)
>
> 2)if Yes, can you please post some sample code which would help me in
> understanding the same?
>
> 3)Can this Muliple Controller concept be used along with the struts modules?
> (or to rephrase...Can the struts modules concept work with more than one
> Controller?)
>
> I am stuck with this for quite some time. If any of you have faced similar
> situations...please guide me or help me with some code snippets.
>
> THanks in advance
> -Amith
>




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