什么时候使用Servlet初始化参数？

Question

I was reading about Initialization Parameters for Servlets on this blog post by Jenkov.

It made me wonder though, when would I ever need to initialize variables this way? If I wanted to predefine certain values, why not just do it with fields in the Java code?

Answer 1

It could be useful if your servlet was packaged in a jar for use by another user, who could then set the input parameters to their own specification in their own servlet definition. If you hard coded it, they could not otherwise 'configure' your servlet.

Answer 2

因为如果您需要更改这些变量，则一个需要编辑web.xml并重新启动servlet，而另一个（您的建议）则需要重新编译应用程序。