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Using Java servlets with the Domino server
To use a Java servlet with Domino, you need to:
1. Enable Java servlet support.
2. Install the servlet.
3. Register the servlet.
4. Access the servlet via the Web.
Step 1: Enabling Java servlet support
In Domino, support for servlets is disabled by
default. To enable servlet
support, edit the server's Notes.ini file and add
the following line:
DominoEnableJavaServlets=1
When you restart the server, it loads the Java
Virtual Machine and
locates the ServletManager Java class, adding the
file icsclass.jar to the
CLASSPATH environment variable automatically. As
the servlet support
is loading, the following three lines appear on the
server console:
01/01/98 11:23:36 AM HTTP Web Server started
01/01/98 11:23:38 AM JVM: Java Virtual Machine
initialized
01/01/98 11:23:38 AM Java Servlet Manager
initialized
Step 2: Installing the servlet
To install a servlet, whether it is one you wrote
or a pre-built one, you
create a Servlets subdirectory in the Domino server
data directory and
copy the compiled servlets into this directory.
Then edit the server's
Notes.ini file and add a setting for
JavaUserClasses to include a path for
this subdirectory. For example:
JavaUserClasses=c:\lotus\notes\data\domino\servlets
Step 3: Registering the servlet
In order to access a servlet from the Web, it must
be registered in a
Domino servlet configuration file, Servlet.cnf,
that you create in the
Domino data directory. When the server starts up,
it checks this
configuration file to see if there are any servlets
to load. In the servlet
configuration file, you must specify each servlet
by name. Optionally, you
can also specify initialization parameters, a
servlet class for URL
mapping, and instructions for loading the servlet
at startup time.
The following example registers the Hello World
servlet with no
parameters and maps the servlet to a URL:
# -- Servlet.cnf
# Register a simple servlet
Servlet HelloWorld Servlet {
}
#Map the servlet to a specific URL
Service HelloWorld /Servlet/Hello
The next example registers a servlet called
DBAccess that does include
initialization parameters and that loads at
startup.
# -- Servlet.cnf
# Register a simple servlet
Servlet DBAccessServlet {
Server=w3.internat.net
Path=/corp2/ordbsh
Acct=JoeUser
GO_LOAD_AT_STARTUP=Yes
}
#Map the servlet to a specific URL
Service DBAccess /Servlet/DBServe
Step 4: Accessing a servlet from the Web
Once the servlet is registered and mapped to a
specific URL, you can
access the servlet with that URL, using full URL
syntax. For example,
entering the URL http://myserver/Servlet/Hello runs
the HelloWorld servlet
registered in the previous step.
Trying it for yourself
To try out the HelloWorld servlet for yourself:
1. Follow step 1 to enable Java servlet
support.
2. Create a servlets subdirectory where Domino
is installed and
copy the HelloWorldServlet.class file below
into it.
3. Copy the SERVLET.CNF file below into your
Domino data
directory.
4. Startup the Web Server and try the
following URL:
http://127.0.0.1/Servlet/HelloWorldServlet
5. If you see "HelloWorld" in a glorious large
font in your browser
window, it works!
Summary
Java servlets are an emerging technology that can
add power to your
Domino applications. Although they may not be as
flashy as applets,
servlets allow you to do more on the server-side of
things, such as
maintaining connections for exchanging data between
applications. Plus,
servlets feature thread-safe code, automatic memory
management and
built-in networking support. Servlets and Domino
make a powerful
combination -- the proof is in the programming.
ABOUT THE AUTHOR
Julie Forgo, a technical writer with more than ten
years' experience, has
documented various aspects of Notes for the past
four years. Her area of
expertise is Domino application development, and
she recently
co-authored a revision of the Best Practices:
Application Developer's
Guide. When not busy extracting feature details
from developers, Julie
chases after her two children and performs miracles
with a hot-glue gun
Artigo completo
http://www.notes.net/today.nsf/3c8c02bbcf9e0d2a85256658007ab2f6/90bdfce8b7d9
672b8525659a0051b7a8?OpenDocument
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