Deploy war file with modifiable properties files

I am building a web service and am packaging it into a war file for deployment. Right now all of my config files (.properties and .xml) are being packaged into my .war file. This isn't going to work as some of these files will need to be modified for each individual installation. I know that some servlet containers will leave the .war files intact which would mean the config files would never be easily modified. My question is this: what is the best practice for deploying a .war file with these external config files? I'm thinking that the config files will need to be shipped separate from the开发者_如何学JAVA .war file and placed into a directory that is in the classpath. Is there a default directory setup like this in Tomcat that these files can just be dropped into and my web service will be able to find without much trouble?

Maybe I shouldn't be using a war file for this setup? Maybe I should just be providing a zip file (with the same contents as the war file) and the deployment will simply be to extract the zip into the webapps directory?

I do not know any default directory in Tomcat to store configuration, my attempts to solve the same issue have been :

1 - Move configuration to the DB and provide scripts or webpages to modify values.
2 - Have a script to deploy the war. The script would merge configuration from a user directory into web.xml or other deployed config files.
3 - Have webapps look first in a user directory for configuration and if not found then look for configuration files deployed by the war.

Least favorite is 3 - it require all webapps to check two places for configuration and you end up with two different xml files on the server with different values and it is not always clear which one is used.

Next favorite is 2 - the webapps can be written without knowledge of multiple config files, but you run into issue when someone does a deploy from Tomcat manager instead of using your script.

Favorite is 1. This just works in most cases. Problem is when you don't have a DB or want to configure how you connect to the DB.

If having the file visible from all webapps is not an issue, you could put it $CATALINA_HOME/lib.

One solution is to modify property file after deployment of war file is to use ServletContext.getRealpath() method to get the real path means path of file in the server where it is deployed and then modify that file it will modify file in container only not the original file. So you need to backup it if it is important modification for you. So by this you do not need to redeploy war file as it is already modifying file from deployed container.

This solution can edit a file that is in webpages folder also from the java class.

If you want more description or how to do it then let me know i have did it.