java - How to read properties file placed outside war?

Question

I'm working on a web application these days. That uses only jsps and servlets. It's a small application. Right now I have placed all the DataSource details in DAO utility class. I want to place these details in a properties file that can be placed outside the war, so that depending on the environment we can change these values, without effecting the war. How can I achieve this?

Answer 1

Provide the file name using context param or java system parameter.

1.Context Param

<context-param>
<param-name>daofilename</param-name>
<param-value>D:daofilename.props</param-value>
</context-param>

2.System Parameter

java -Ddao.filename=D:daofilename.props server