On 10/1/2012 4:11 PM, Konstantin Kolinko wrote:
2012/10/1 Mark Eggers <its_toas...@yahoo.com>:
On 10/1/2012 8:38 AM, Aggarwal, Ajay wrote:
Is the configured hostname available in ServletContext? I see it in
debugger, but I don't see any method to access it from ServletContext
class. I am using virtual hosts and need this value inside my
ServletContextListener ::contextInitialized() call back.
Thanks.
-Ajay
I've not found a convenient way to manage this. Getting the host name when
you are using multiple Host elements in your server.xml appears to return
the host you're running on (and not the Host element name or alias).
The easiest way I've found to do this is as follows.
1. Create a context.xml.default
In each CATALINA_BASE/conf/[engine]/[hostname] create an XML file called
context.xml.default. [engine] is usually Catalina. This default context gets
added to all web applications in that [hostname].
2. Add a JNDI environment resource to the context.xml.default
In each context.xml.default file, add a resource something like the
following:
<Context>
<Environment name="hostname" value="your-hostname-goes-here"
type="java.lang.String" override="false"/>
</Context>
Interesting idea.
The following will also work and the value will be easier to obtain:
<Parameter name="hostname" value="your-hostname-goes-here"
override="false"/>
3. In your servlet context listener, read the information
Something like this - and then do with it what you want.
// lots of imports omitted
ServletContext sc = sce.getServletContext();
try {
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
String hostname = (String) envCtx.lookup("hostname");
if (hostname != null) {
sc.setAttribute("hostname", hostname); // or anything else
}
} catch (NamingException ex) {
// do something nice about logging here
}
One other possible way:
- Implement a LifecycleListener and attach it to
org.apache.catalina.core.StandardContext class. That is, add it as
<Listener> to context.xml file.
- The host name could be obtained as StandardContext.getParent().getName()
- It can be passed to the web application as a context attribute, via
StandardContext.getServletContext().setAttribute(name, value)
See the following documentation for Tomcat 6 (which is where I've tried
this).
http://tomcat.us.apache.org/tomcat-6.0-doc/jndi-resources-howto.html
http://tomcat.us.apache.org/tomcat-6.0-doc/config/context.html
The server name above should be "tomcat.apache.org". The us mirror is
one of two servers behind it.
I suspect it's the same in Tomcat 7. Read the appropriate documentation to
find out.
Best regards,
Konstantin Kolinko
Yep, sorry for posting the US mirror. Unfortunately I've been getting a
lot of 'NO DATA SENT' from tomcat.apache.org lately.
. . . . just my two cents
/mde/
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