A Web Archive (WAR) file is a portable, packaged Web application that you can import into your workspace.
Before importing a WAR file, you should first determine if the WAR file contains needed Java™ source files. When importing a WAR file into an existing Web project, the imported Web deployment descriptor files are either not changed or overwritten by the ones included in the imported WAR file, based on your response to the prompt that is provided. In either case, this action does not represent a merging of the two sets of deployment descriptors.
To import the Web project resources in a WAR file into your workspace, complete the following steps: