使用电子邮件列表列表提供Java webapp的最简单方法

I'm renovating a legacy Java webapp ( servlets and JSPs ) I inherited. The webapp sends email and it uses about 12 lists of email addresses. The email addresses are hard coded into the webapp. Naturally, I want to put those lists of email addresses into a file and have the webapp read them in.I'm renovating a legacy Java webapp ( servlets