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How do I get <url-pattern> of a servlet ?

1 reply on 1 page. Most recent reply: Apr 23, 2002 5:09 PM by Jay Kandy

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smallufo

Posts: 1
Nickname: smallufo
Registered: Apr, 2002

How do I get <url-pattern> of a servlet ?

Posted: Apr 22, 2002 12:34 AM

How do I dynamically put a link to another servlet under the same WebApp

In a servlet1 , I want to write a link to another servlet2
servlet1 and servlet2 are under the same WebApp
I don't want to hardcode the link in the URL...

The problem I encounter is that it seems ServletSpec didn't mention
how to get one servlet's <url-pattern> value !!

for example , I set a web-app id to '/' in resin.conf by this :


<host id='k3.smallufo.com'>    
  <error-log id='log/error.log' />    
  <web-app id='/' app-dir='/home/k3/www' />  
</host>

And in /home/k3/www/WEB-INF/web.xml , I set the following <URL-PATTERN>


<web-app>  
  <!-- SKIP -->  
  <servlet-mapping url-pattern='/servlet/*' servlet-name='invoker' />
</web-app>

testServlet's full qualified name is : com.smallufo.k3.webapp.testServlet
Another testServlet2's full qualified name is : com.smallufo.k3.webapp.testServlet2

I want to write a link in testServlet to testServlet2 , by not hardcoding the URL in servlet code
therefore , I write like this :


String URL = req.getScheme()+"://"+
             req.getServerName() + ":" +
             req.getServerPort() +
             req.getContextPath()+
             "/com.smallufo.k3.webapp.testServlet2";

but it comes the problem...It cannot work , because it combines like this :
'http://k3.smallufo.com:80/com.smallufo.k3.webapp.testServlet2'
In Servlet spec , there is no way to get the URL-PATTERN = '/servlet/' !!!

The only one way I can think of is by using HttpServletRequest.getServletPath()
to get '/servlet/com.smallufo.k3.webapp.testServlet' , and process the string to get '/servlet/'
but it is too inconvenient !!!

Is there any better solution ?

Jay Kandy

Posts: 77
Nickname: jay
Registered: Mar, 2002

Re: How do I get <url-pattern> of a servlet ?

Posted: Apr 23, 2002 5:09 PM

Correct if I am wrong but isnt it a servlet container's job to invoke a servlet based on the <url-pattern> and not the other way around? The method getServletPath gives the path of the servlet that is serving the request. So parsing for /servlet/ in the servlet path wouldnt work unless it was a conincidence that the two servlets have the same servlet path. Consider if your web.xml read this way:


<servlet-mapping>
	<servlet-name>Servlet1</servlet-name>
	<url-pattern>/servlet/Servlet1</url-pattern>
</servlet-mapping&g t;

<servlet-mapping>
	<servlet-name>Servlet2</servlet-name>
	<url-pattern>/hello/world/Servlet2</url-pattern>
</servlet-mappi ng>

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