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From Jacob Kjome <h...@visi.com>
Subject Re[4]: file path problem
Date Mon, 06 May 2002 21:40:06 GMT
Hello Bharanidharan,

Ah, I didn't see that before.

You don't want to store your static files under WEB-INF.  That is
purely for servlets and other general classes and some config stuff
such as the web.xml that you don't want to have directly accessible
via the web.

You would put your html file one directory up from WEB-INF in your
"jetspeed" directory.  This is also where you would put .jsp files.

Also, you don't actually have to provide the /servlet/* mapping in
your own web.xml.  You will get that functionality already because it
is in Tomcat's default web.xml.  All you need to know is that it is
the functionality that it provides.

Now, keep in mind that nothing within WEB-INF will be accessible
without some sort of mapping.  We are using the default /servlet/
mapping that Tomcat provides.

So, when you see:

http://www.myhost.com/jetspeed/servlet/myservlet.NewLogin

The "/servlet" part of of that URL is virtual.  The mapping is
provided by the web server.  The request goes through an invoker
servlet that runs the requested servlet for you.  That is much different than going to your
html file which should be at...

http://www.myhost.com/jetspeed/templates/vm/navigations/html/loggedinportlet.html

Although, that assumes that you would move the root of "templates"
into the "jetspeed" directory rather than have it exist under the
WEB-INF directory.

As you can see, the server needs no mapping information for static
files other than knowing what directory or virtual directory
http://www.myhost.com/jetspeed/ points to.  After that, you just
follow the directory structure within the "jetspeed" directory to
determine the URL path to the static document.  This is not so with
servlets.  You can't just browse to a servlet at some physical path on
the disk.  You refer to servlets through servlet mappings.

BTW, if you created a directory called "servlet" to store static
files, you wouldn't be able to get to them because Tomcat would
intercept the pattern /servlet/ and try to map the named entity that
comes after that rather than serving the named entity directly from
that directory.

For instance, if you had:
/webapps/jetspeed/servlet/templates/vm/navigations/html/loggedinportlet.html

and tried to get to that page via:
http://www.myhost.com/jetspeed/servlet/templates/vm/navigations/html/loggedinportlet.html

Tomcat would report an http 404 error because it tries to find a
servlet to invoke named
"templates/vm/navigations/html/loggedinportlet.html" or with a
class name of "templates/vm/navigations/html/loggedinportlet.html"

Which brings to mind another trick.  You can name your servlet and get
there via the servlet-name rather than having to specify the whole
package + Servlet class name adding the following to your web.xml:

<servlet>
        <servlet-name>newlogin</servlet-name>
        <servlet-class>myclasses.NewLogin</servlet-class>
</servlet>

Now you can get to your servlet via the class-name:

http://www.myhost.com/jetspeed/servlet/myservlet.NewLogin

or via the servlet-name:

http://www.myhost.com/jetspeed/servlet/newlogin

You can also, then, provide your own mapping for the servlet named
"newlogin" such as:

<servlet-mapping>
        <servlet-name>newlogin</servlet-name>
        <url-pattern>/login</url-pattern>
</servlet-mapping>

which allows you to get to your servlet without having to go through
the default /servlet/ mapping like this:

http://www.myhost.com/jetspeed/login

notice that the "servlet-name" in "servlet" and "servlet-mapping" must
be *exactly* the same (case sensitive too).


Does that make more sense or did I just add to the confusion?

Jake

Monday, May 06, 2002, 3:14:21 PM, you wrote:

MB> Jack.. i am sorry its very complicated for me and i didnt understand
MB> anything you said.. I am new to tomcat environment. 

MB> I have a servlet under
MB> /webapps/jetspeed/Web-inf/classes/myservlet/NewLogin.class. In that servlet
MB> i have to call a html file that is kept under
MB> /webapps/jetspeed/Web-inf/templates/vm/navigations/html/loggedinportlet.html
MB> . 

MB> I have the following code in web.xml

MB> <!-- The mapping for the invoker servlet -->
MB>   <servlet-mapping>
MB>     <servlet-name>invoker</servlet-name>
MB>     <url-pattern>/servlet/*</url-pattern>
MB>   </servlet-mapping>



MB> how do i map the html file in my NewLogin.class servlet. i still dont get
MB> how the webpath is mapped to the system file path... 

MB> sorry for the inconvenience.

MB> please let me know..

MB> thanks
MB> bharani.
MB> -----Original Message-----
MB> From: Jacob Kjome [mailto:hoju@visi.com]
MB> Sent: Monday, May 06, 2002 3:52 PM
MB> To: Tomcat Users List
MB> Subject: Re[2]: file path problem


MB> Hello Bharanidharan,

MB> /servlet/ is a mapping provided for you by Tomcat.  In fact, take a
MB> look in the web.xml in $TOMCAT_HOME/conf and look for that mapping:

MB> <!-- The mapping for the invoker servlet -->
MB>   <servlet-mapping>
MB>     <servlet-name>invoker</servlet-name>
MB>     <url-pattern>/servlet/*</url-pattern>
MB>   </servlet-mapping>


MB> If tomcat didn't provide this, you would have to set up a mapping for
MB> each and every one of your servlets that you wished to run.  With
MB> this, you can run any servlet in your webapp by naming the servlet
MB> with the full package name.

MB> When you want a more convenient URL to invoke your servlet, you can
MB> provide your own mapping in a similar way as the above example in your
MB> own web.xml.

MB> Keep in mind that the /servlet/ mapping is *not* guaranteed to exist
MB> across containers, although I would imagine that a number of
MB> containers might just copy Tomcat's lead on this to be compatible.

MB> Jake

MB> Monday, May 06, 2002, 2:16:11 PM, you wrote:

MB>> jack,
MB>>     I have a quick question. in your example below, i.e.

MB>> http://www.myserver.com/mywebapp/servlet/myservlets.login


MB>> you mean to say "servlet" in the URL is mapped to "Web-inf" directory
MB> under
MB>> jetspeed??.. i am still unable to comprehend the url path.


MB>> thanks
MB>> bharani

MB>> -----Original Message-----
MB>> From: Jacob Kjome [mailto:hoju@visi.com]
MB>> Sent: Monday, May 06, 2002 1:08 PM
MB>> To: Tomcat Users List
MB>> Subject: Re: file path problem


MB>> Hello Bharanidharan,

MB>> Don't confuse the system file path with the URL path.

MB>> What URL is in your browser on the page that contains the
MB>> window.open()?

MB>> window.open will try to find the page relative to your domain root.

MB>> If you are at:

MB>> http://www.myserver.com/mywebapp/servlet/myservlets.login

MB>> Then the code you have for window.open will be attempting to find a
MB>> directory on the server that simply doesn't exist.  You would be able
MB>> to get to your "myhtml" directory with this, though.

MB>> window.open("../myhtml/loggedin.html");

MB>> However, you can't count on this, because what if you did a servlet
MB>> mapping and you got to your login servlet via:

MB>> http://www.myserver.com/mywebapp/login

MB>> now, the proper way to get to your html page would be:

MB>> window.open("myhtml/loggedin.html");

MB>> The issue here is that you are hard-coding a path that can't be
MB>> assumed.  What you should do, instead is the following:

MB>> out.println("window.open(\"" + req.getContextPath() +
MB>> "/myhtml/loggedin.html\")";


MB>> After doing this, it doesn't matter where you invoke your servlet from
MB>> as long as the static html is in the proper location relative to the
MB>> root of the webapp.

MB>> Jake

MB>> Monday, May 06, 2002, 11:30:37 AM, you wrote:

MB>>> Hi all,
MB>>>        I have my login servlet under
MB>>> webapp/jetspeed/web-inf/classes/myservlets/login.class. I invoke a
MB>>> loggedin.html from this servlet. loggedin.html is located under
MB>>> webapps/jetspeed/myhtml/loggedin.html. so in my servlet, i gave 


MB>>>       window.open("../../../myhtml/loggedin.html");.

MB>>> but apache gives error saying resource /myhtml/loggedin.html couldnt
MB> not
MB>> be
MB>>> found. I tried copying this file to various directories including the
MB>>> template directories under jetspeed but no success.. can someone how
MB> the
MB>>> file path is specified in jetspeed..


MB>>> thanks
MB>>> bharani.

MB>>> --
MB>>> To unsubscribe, e-mail:
MB>> <mailto:tomcat-user-unsubscribe@jakarta.apache.org>
MB>>> For additional commands, e-mail:
MB>> <mailto:tomcat-user-help@jakarta.apache.org>









-- 
Best regards,
 Jacob                            mailto:hoju@visi.com


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