A Web archive (WAR) file is a packaged Web application that
can be exported to test, publish, and deploy the resources developed within
a Web project.
To export a WAR file from a Web project, do the following:
Right click on a Web project folder and select Export from
the pop-up menu. Then select WAR file in the Export window and then
Specify the Web project you want to export (this field is primed
if you used the pop-up menu to open the wizard), and specify a location for
the new WAR file
Optional: Optionally, supply WAR export Options,
such as whether or not to include Java™ source files in the WAR, and whether
to overwrite any existing resources during the export process. Source
files are not usually included in a WAR file, because they are not necessary
for the server to run the web application.